diff --git a/ap/libc/glibc/glibc-2.23/csu/Makefile b/ap/libc/glibc/glibc-2.23/csu/Makefile
new file mode 100644
index 0000000..31e8bb9
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/Makefile
@@ -0,0 +1,156 @@
+# Makefile for csu code for GNU C library.
+# Copyright (C) 1995-2016 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+# This directory contains the C startup code (that which calls main).  This
+# consists of the startfile, built from start.c and installed as crt0.o
+# (traditionally) or crt1.o (for ELF).	In ELF we also install crti.o and
+# crtn.o, special "initializer" and "finalizer" files used in the link
+# to make the .init and .fini sections work right.
+
+subdir := csu
+
+include ../Makeconfig
+
+routines = init-first libc-start $(libc-init) sysdep version check_fds \
+	   libc-tls elf-init dso_handle
+aux	 = errno
+elide-routines.os = libc-tls
+static-only-routines = elf-init
+csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
+extra-objs = start.o \
+	     $(start-installed-name) g$(start-installed-name) $(csu-dummies) \
+	     S$(start-installed-name)
+omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
+			     b$(start-installed-name) $(csu-dummies) \
+			     S$(start-installed-name))
+install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
+generated += version-info.h
+before-compile += $(objpfx)version-info.h
+
+tests := tst-empty tst-atomic tst-atomic-long
+tests-static := tst-empty
+
+ifeq (yes,$(build-shared))
+extra-objs += S$(start-installed-name) gmon-start.os
+ifneq ($(start-installed-name),$(static-start-installed-name))
+extra-objs += gmon-start.o
+endif
+install-lib += S$(start-installed-name)
+generated += start.os
+else
+extra-objs += gmon-start.o
+endif
+
+ifneq ($(start-installed-name),$(static-start-installed-name))
+extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
+omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
+			     g$(static-start-installed-name))
+install-lib += $(static-start-installed-name) g$(static-start-installed-name)
+endif
+
+before-compile += $(objpfx)abi-tag.h
+generated += abi-tag.h
+
+# These are the special initializer/finalizer files.  They are always the
+# first and last file in the link.  crti.o ... crtn.o define the global
+# "functions" _init and _fini to run the .init and .fini sections.
+crtstuff = crti crtn
+
+install-lib += $(crtstuff:=.o)
+extra-objs += $(crtstuff:=.o)
+
+extra-objs += abi-note.o init.o
+asm-CPPFLAGS += -I$(objpfx).
+
+include ../Rules
+
+# Make these in the lib pass so they're available in time to link things with.
+subdir_lib: $(extra-objs:%=$(objpfx)%)
+
+define link-relocatable
+$(CC) -nostdlib -nostartfiles -r -o $@ $^
+endef
+
+ifndef start-installed-name-rule
+# We link the ELF startfile along with a SHT_NOTE section indicating
+# the kernel ABI the binaries linked with this library will require.
+$(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
+				  $(objpfx)init.o
+	$(link-relocatable)
+$(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
+				  $(objpfx)init.o
+	$(link-relocatable)
+endif
+
+# The profiling startfile is made by linking together the normal
+# startfile with gmon-start.o, which defines a constructor function
+# to turn on profiling code at startup.
+ifeq (yes,$(build-shared))
+$(objpfx)g$(start-installed-name): \
+  $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os
+	$(link-relocatable)
+ifneq ($(start-installed-name),$(static-start-installed-name))
+$(objpfx)g$(static-start-installed-name): \
+  $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
+	$(link-relocatable)
+endif
+else
+$(addprefix $(objpfx),$(sort g$(start-installed-name) \
+			     g$(static-start-installed-name))): \
+  $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
+	$(link-relocatable)
+endif
+
+# These extra files are sometimes expected by system standard linking
+# procedures, but we have nothing for them to do.  So compile empty files.
+$(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
+  $(before-compile)
+	$(COMPILE.c) -o $@ -x c /dev/null
+
+# These headers are used by the startup code.
+$(objpfx)abi-tag.h: $(..)abi-tags
+	$(make-target-directory)
+	rm -f $@.new
+	sed -e 's/#.*$$//' -e '/^[	]*$$/d' $< | \
+	while read conf tagos tagver; do \
+	  test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
+		     : "$$conf"` != 0 || continue; \
+	  ( echo "$$tagos" | \
+	    sed -e 's/[^0-9xXa-fA-F 	]//' \
+		-e 's/^/#define __ABI_TAG_OS /'; \
+	    echo "#ifndef __ABI_TAG_VERSION"; \
+	    echo "$$tagver" | \
+	    sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
+	      -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
+	    echo "#endif" ) > $@.new; \
+	done
+	if test -r $@.new; then mv -f $@.new $@; \
+	else echo >&2 'This configuration not matched in $<'; exit 1; fi
+
+all-Banner-files = $(wildcard $(addsuffix /Banner,\
+					  $(sort $(subdir-srcdirs) \
+						 $(sysdeps-srcdirs))))
+$(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
+	$(make-target-directory)
+	(files="$(all-Banner-files)";				\
+	 if test -n "$$files"; then				\
+	   printf '"Available extensions:\\n"\n';		\
+	   sed -e '/^#/d' -e 's/^[[:space:]]*/	/'		\
+	       -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;		\
+	 fi) > $@T
+	mv -f $@T $@
diff --git a/ap/libc/glibc/glibc-2.23/csu/Versions b/ap/libc/glibc/glibc-2.23/csu/Versions
new file mode 100644
index 0000000..43010c3
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/Versions
@@ -0,0 +1,13 @@
+libc {
+  GLIBC_2.0 {
+    # helper functions
+    __libc_init_first; __libc_start_main;
+  }
+  GLIBC_2.1 {
+    # New special glibc functions.
+    gnu_get_libc_release; gnu_get_libc_version;
+  }
+  GLIBC_PRIVATE {
+    errno;
+  }
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/abi-note.S b/ap/libc/glibc/glibc-2.23/csu/abi-note.S
new file mode 100644
index 0000000..eed2ceb
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/abi-note.S
@@ -0,0 +1,72 @@
+/* Special .init and .fini section support.
+   Copyright (C) 1997-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file.  (The Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Define an ELF note identifying the operating-system ABI that the
+   executable was created for.  The ELF note information identifies a
+   particular OS or coordinated development effort within which the
+   ELF header's e_machine value plus (for dynamically linked programs)
+   the PT_INTERP dynamic linker name and DT_NEEDED shared library
+   names fully identify the runtime environment required by an
+   executable.
+
+   The general format of ELF notes is as follows.
+   Offsets and lengths are bytes or (parenthetical references) to the
+   values in other fields.
+
+offset	length	contents
+0	4	length of name
+4	4	length of data
+8	4	note type
+12	(0)	vendor name
+		- null-terminated ASCII string, padded to 4-byte alignment
+12+(0)	(4)	note data,
+
+   The GNU project and cooperating development efforts (including the
+   Linux community) use note type 1 and a vendor name string of "GNU"
+   for a note descriptor that indicates ABI requirements.  The note data
+   is four 32-bit words.  The first of these is an operating system
+   number (0=Linux, 1=Hurd, 2=Solaris, ...) and the remaining three
+   identify the earliest release of that OS that supports this ABI.
+   See abi-tags (top level) for details. */
+
+#include <config.h>
+#include <abi-tag.h>		/* OS-specific ABI tag value */
+
+/* The linker (GNU ld 2.8 and later) recognizes an allocated section whose
+   name begins with `.note' and creates a PT_NOTE program header entry
+   pointing at it. */
+
+	.section ".note.ABI-tag", "a"
+	.p2align 2
+	.long 1f - 0f		/* name length */
+	.long 3f - 2f		/* data length */
+	.long  1		/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:	.p2align 2
+2:	.long __ABI_TAG_OS	/* note data: the ABI tag */
+	.long __ABI_TAG_VERSION
+3:	.p2align 2		/* pad out section */
diff --git a/ap/libc/glibc/glibc-2.23/csu/check_fds.c b/ap/libc/glibc/glibc-2.23/csu/check_fds.c
new file mode 100644
index 0000000..baa77a9
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/check_fds.c
@@ -0,0 +1,101 @@
+/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+
+/* Try to get a machine dependent instruction which will make the
+   program crash.  This is used in case everything else fails.  */
+#include <abort-instr.h>
+#ifndef ABORT_INSTRUCTION
+/* No such instruction is available.  */
+# define ABORT_INSTRUCTION
+#endif
+
+#include <device-nrs.h>
+#include <not-cancel.h>
+
+
+/* Should other OSes (e.g., Hurd) have different versions which can
+   be written in a better way?  */
+static void
+check_one_fd (int fd, int mode)
+{
+  /* Note that fcntl() with this parameter is not a cancellation point.  */
+  if (__builtin_expect (__libc_fcntl (fd, F_GETFD), 0) == -1
+      && errno == EBADF)
+    {
+      const char *name;
+      dev_t dev;
+
+      /* For writable descriptors we use /dev/full.  */
+      if ((mode & O_ACCMODE) == O_WRONLY)
+	{
+	  name = _PATH_DEV "full";
+	  dev = makedev (DEV_FULL_MAJOR, DEV_FULL_MINOR);
+	}
+      else
+	{
+	  name = _PATH_DEVNULL;
+	  dev = makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR);
+	}
+
+      /* Something is wrong with this descriptor, it's probably not
+	 opened.  Open /dev/null so that the SUID program we are
+	 about to start does not accidentally use this descriptor.  */
+      int nullfd = open_not_cancel (name, mode, 0);
+
+      /* We are very paranoid here.  With all means we try to ensure
+	 that we are actually opening the /dev/null device and nothing
+	 else.
+
+	 Note that the following code assumes that STDIN_FILENO,
+	 STDOUT_FILENO, STDERR_FILENO are the three lowest file
+	 decsriptor numbers, in this order.  */
+      struct stat64 st;
+      if (__builtin_expect (nullfd != fd, 0)
+	  || __builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) != 0
+	  || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
+	  || st.st_rdev != dev)
+	/* We cannot even give an error message here since it would
+	   run into the same problems.  */
+	while (1)
+	  /* Try for ever and ever.  */
+	  ABORT_INSTRUCTION;
+    }
+}
+
+
+void
+__libc_check_standard_fds (void)
+{
+  /* This is really paranoid but some people actually are.  If /dev/null
+     should happen to be a symlink to somewhere else and not the device
+     commonly known as "/dev/null" we bail out.  We can detect this with
+     the O_NOFOLLOW flag for open() but only on some system.  */
+#ifndef O_NOFOLLOW
+# define O_NOFOLLOW	0
+#endif
+  /* Check all three standard file descriptors.  */
+  check_one_fd (STDIN_FILENO, O_WRONLY | O_NOFOLLOW);
+  check_one_fd (STDOUT_FILENO, O_RDONLY | O_NOFOLLOW);
+  check_one_fd (STDERR_FILENO, O_RDONLY | O_NOFOLLOW);
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/dso_handle.c b/ap/libc/glibc/glibc-2.23/csu/dso_handle.c
new file mode 100644
index 0000000..7a614ca
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/dso_handle.c
@@ -0,0 +1,21 @@
+/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* We have to define __dso_handle ourselves since we do not use gcc's
+   crtbegin files.  */
+const void *const __dso_handle __attribute__ ((__visibility__ ("hidden")))
+  = &__dso_handle;
diff --git a/ap/libc/glibc/glibc-2.23/csu/elf-init.c b/ap/libc/glibc/glibc-2.23/csu/elf-init.c
new file mode 100644
index 0000000..0fb98f1
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/elf-init.c
@@ -0,0 +1,106 @@
+/* Startup support for ELF initializers/finalizers in the main executable.
+   Copyright (C) 2002-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+
+
+/* These magic symbols are provided by the linker.  */
+extern void (*__preinit_array_start []) (int, char **, char **)
+  attribute_hidden;
+extern void (*__preinit_array_end []) (int, char **, char **)
+  attribute_hidden;
+extern void (*__init_array_start []) (int, char **, char **)
+  attribute_hidden;
+extern void (*__init_array_end []) (int, char **, char **)
+  attribute_hidden;
+extern void (*__fini_array_start []) (void) attribute_hidden;
+extern void (*__fini_array_end []) (void) attribute_hidden;
+
+
+#ifndef NO_INITFINI
+/* These function symbols are provided for the .init/.fini section entry
+   points automagically by the linker.  */
+extern void _init (void);
+extern void _fini (void);
+#endif
+
+
+/* These functions are passed to __libc_start_main by the startup code.
+   These get statically linked into each program.  For dynamically linked
+   programs, this module will come from libc_nonshared.a and differs from
+   the libc.a module in that it doesn't call the preinit array.  */
+
+
+void
+__libc_csu_init (int argc, char **argv, char **envp)
+{
+  /* For dynamically linked executables the preinit array is executed by
+     the dynamic linker (before initializing any shared object).  */
+
+#ifndef LIBC_NONSHARED
+  /* For static executables, preinit happens right before init.  */
+  {
+    const size_t size = __preinit_array_end - __preinit_array_start;
+    size_t i;
+    for (i = 0; i < size; i++)
+      (*__preinit_array_start [i]) (argc, argv, envp);
+  }
+#endif
+
+#ifndef NO_INITFINI
+  _init ();
+#endif
+
+  const size_t size = __init_array_end - __init_array_start;
+  for (size_t i = 0; i < size; i++)
+      (*__init_array_start [i]) (argc, argv, envp);
+}
+
+/* This function should not be used anymore.  We run the executable's
+   destructor now just like any other.  We cannot remove the function,
+   though.  */
+void
+__libc_csu_fini (void)
+{
+#ifndef LIBC_NONSHARED
+  size_t i = __fini_array_end - __fini_array_start;
+  while (i-- > 0)
+    (*__fini_array_start [i]) ();
+
+# ifndef NO_INITFINI
+  _fini ();
+# endif
+#endif
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/errno-loc.c b/ap/libc/glibc/glibc-2.23/csu/errno-loc.c
new file mode 100644
index 0000000..d8bbb5f
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/errno-loc.c
@@ -0,0 +1,28 @@
+/* MT support function to get address of `errno' variable, non-threaded
+   version.
+   Copyright (C) 1996-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <tls.h>
+
+int *
+__errno_location (void)
+{
+  return &errno;
+}
+libc_hidden_def (__errno_location)
diff --git a/ap/libc/glibc/glibc-2.23/csu/errno.c b/ap/libc/glibc/glibc-2.23/csu/errno.c
new file mode 100644
index 0000000..778c941
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/errno.c
@@ -0,0 +1,35 @@
+/* Definition of `errno' variable.  Canonical version.
+   Copyright (C) 2002-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <tls.h>
+#include <dl-sysdep.h>
+#undef errno
+
+#if RTLD_PRIVATE_ERRNO
+
+/* Code compiled for rtld refers only to this name.  */
+int rtld_errno attribute_hidden;
+
+#else
+
+__thread int errno;
+extern __thread int __libc_errno __attribute__ ((alias ("errno")))
+  attribute_hidden;
+
+#endif
diff --git a/ap/libc/glibc/glibc-2.23/csu/gmon-start.c b/ap/libc/glibc/glibc-2.23/csu/gmon-start.c
new file mode 100644
index 0000000..62c123c
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/gmon-start.c
@@ -0,0 +1,92 @@
+/* Code to enable profiling at program startup.
+   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file.  (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so.  The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/types.h>
+#include <sys/gmon.h>
+#include <stdlib.h>
+#include <unistd.h>
+#define __ASSEMBLY__
+#include <entry.h>
+
+/* Beginning and end of our code segment. We cannot declare them
+   as the external functions since we want the addresses of those
+   labels. Taking the address of a function may have different
+   meanings on different platforms. */
+#ifdef ENTRY_POINT_DECL
+ENTRY_POINT_DECL(extern)
+#else
+extern char ENTRY_POINT[];
+#endif
+extern char etext[];
+
+#ifndef TEXT_START
+# ifdef ENTRY_POINT_DECL
+#  define TEXT_START ENTRY_POINT
+# else
+#  define TEXT_START &ENTRY_POINT
+# endif
+#endif
+
+#ifdef GMON_START_ARRAY_SECTION
+static void __gmon_start__ (void);
+static void (*const gmon_start_initializer) (void)
+  __attribute__ ((used, section (GMON_START_ARRAY_SECTION))) = &__gmon_start__;
+static
+#else
+/* We cannot use the normal constructor mechanism to call
+   __gmon_start__ because gcrt1.o appears before crtbegin.o in the link.
+   Instead crti.o calls it specially.  */
+extern void __gmon_start__ (void);
+#endif
+
+void
+__gmon_start__ (void)
+{
+  /* Protect from being called more than once.  Since crti.o is linked
+     into every shared library, each of their init functions will call us.  */
+  static int called;
+
+  if (called)
+    return;
+
+  called = 1;
+
+  /* Start keeping profiling records.  */
+  __monstartup ((u_long) TEXT_START, (u_long) &etext);
+
+  /* Call _mcleanup before exiting; it will write out gmon.out from the
+     collected data.  */
+  atexit (&_mcleanup);
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/init-first.c b/ap/libc/glibc/glibc-2.23/csu/init-first.c
new file mode 100644
index 0000000..77c6e1c
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/init-first.c
@@ -0,0 +1,112 @@
+/* Initialization code run first thing by the ELF startup code.  Common version
+   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sysdep.h>
+#include <fpu_control.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <libc-internal.h>
+
+#include <ldsodefs.h>
+
+/* Set nonzero if we have to be prepared for more than one libc being
+   used in the process.  Safe assumption if initializer never runs.  */
+int __libc_multiple_libcs attribute_hidden = 1;
+
+/* Remember the command line argument and enviroment contents for
+   later calls of initializers for dynamic libraries.  */
+int __libc_argc attribute_hidden;
+char **__libc_argv attribute_hidden;
+
+
+void
+__libc_init_first (int argc, char **argv, char **envp)
+{
+#ifdef SHARED
+  /* For DSOs we do not need __libc_init_first but instead _init.  */
+}
+
+void
+attribute_hidden
+_init (int argc, char **argv, char **envp)
+{
+#endif
+#ifdef USE_NONOPTION_FLAGS
+  extern void __getopt_clean_environment (char **);
+#endif
+
+  __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
+
+  /* Make sure we don't initialize twice.  */
+  if (!__libc_multiple_libcs)
+    {
+      /* Set the FPU control word to the proper default value if the
+	 kernel would use a different value.  */
+      if (__fpu_control != GLRO(dl_fpu_control))
+	__setfpucw (__fpu_control);
+    }
+
+  /* Save the command-line arguments.  */
+  __libc_argc = argc;
+  __libc_argv = argv;
+  __environ = envp;
+
+#ifndef SHARED
+  __libc_init_secure ();
+
+  /* First the initialization which normally would be done by the
+     dynamic linker.  */
+  _dl_non_dynamic_init ();
+#endif
+
+#ifdef VDSO_SETUP
+  VDSO_SETUP ();
+#endif
+
+  __init_misc (argc, argv, envp);
+
+#ifdef USE_NONOPTION_FLAGS
+  /* This is a hack to make the special getopt in GNU libc working.  */
+  __getopt_clean_environment (envp);
+#endif
+
+  /* Initialize ctype data.  */
+  __ctype_init ();
+
+#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
+  __libc_global_ctors ();
+#endif
+}
+
+/* This function is defined here so that if this file ever gets into
+   ld.so we will get a link error.  Having this file silently included
+   in ld.so causes disaster, because the _init definition above will
+   cause ld.so to gain an init function, which is not a cool thing. */
+
+extern void _dl_start (void) __attribute__ ((noreturn));
+
+void
+_dl_start (void)
+{
+  abort ();
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/init.c b/ap/libc/glibc/glibc-2.23/csu/init.c
new file mode 100644
index 0000000..9327726
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/init.c
@@ -0,0 +1,26 @@
+/* Special startup support.
+   Copyright (C) 1997-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if defined __GNUC__ && __GNUC__ >= 2
+
+#include <_G_config.h>
+
+/* This records which stdio is linked against in the application. */
+const int _IO_stdin_used = _G_IO_IO_FILE_VERSION;
+
+#endif
diff --git a/ap/libc/glibc/glibc-2.23/csu/libc-start.c b/ap/libc/glibc/glibc-2.23/csu/libc-start.c
new file mode 100644
index 0000000..f4aa01a
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/libc-start.c
@@ -0,0 +1,324 @@
+/* Copyright (C) 1998-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <exit-thread.h>
+
+extern void __libc_init_first (int argc, char **argv, char **envp);
+#ifndef SHARED
+extern void __libc_csu_irel (void);
+#endif
+
+extern int __libc_multiple_libcs;
+
+#include <tls.h>
+#ifndef SHARED
+# include <dl-osinfo.h>
+extern void __pthread_initialize_minimal (void);
+# ifndef THREAD_SET_STACK_GUARD
+/* Only exported for architectures that don't store the stack guard canary
+   in thread local area.  */
+uintptr_t __stack_chk_guard attribute_relro;
+# endif
+# ifndef  THREAD_SET_POINTER_GUARD
+/* Only exported for architectures that don't store the pointer guard
+   value in thread local area.  */
+uintptr_t __pointer_chk_guard_local
+	attribute_relro attribute_hidden __attribute__ ((nocommon));
+# endif
+#endif
+
+#ifdef HAVE_PTR_NTHREADS
+/* We need atomic operations.  */
+# include <atomic.h>
+#endif
+
+
+#ifndef SHARED
+# include <link.h>
+# include <dl-irel.h>
+
+# ifdef ELF_MACHINE_IRELA
+#  define IREL_T	ElfW(Rela)
+#  define IPLT_START	__rela_iplt_start
+#  define IPLT_END	__rela_iplt_end
+#  define IREL		elf_irela
+# elif defined ELF_MACHINE_IREL
+#  define IREL_T	ElfW(Rel)
+#  define IPLT_START	__rel_iplt_start
+#  define IPLT_END	__rel_iplt_end
+#  define IREL		elf_irel
+# endif
+
+static void
+apply_irel (void)
+{
+# ifdef IREL
+  /* We use weak references for these so that we'll still work with a linker
+     that doesn't define them.  Such a linker doesn't support IFUNC at all
+     and so uses won't work, but a statically-linked program that doesn't
+     use any IFUNC symbols won't have a problem.  */
+  extern const IREL_T IPLT_START[] __attribute__ ((weak));
+  extern const IREL_T IPLT_END[] __attribute__ ((weak));
+  for (const IREL_T *ipltent = IPLT_START; ipltent < IPLT_END; ++ipltent)
+    IREL (ipltent);
+# endif
+}
+#endif
+
+
+#ifdef LIBC_START_MAIN
+# ifdef LIBC_START_DISABLE_INLINE
+#  define STATIC static
+# else
+#  define STATIC static inline __attribute__ ((always_inline))
+# endif
+#else
+# define STATIC
+# define LIBC_START_MAIN __libc_start_main
+#endif
+
+#ifdef MAIN_AUXVEC_ARG
+/* main gets passed a pointer to the auxiliary.  */
+# define MAIN_AUXVEC_DECL	, void *
+# define MAIN_AUXVEC_PARAM	, auxvec
+#else
+# define MAIN_AUXVEC_DECL
+# define MAIN_AUXVEC_PARAM
+#endif
+
+STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
+					 MAIN_AUXVEC_DECL),
+			    int argc,
+			    char **argv,
+#ifdef LIBC_START_MAIN_AUXVEC_ARG
+			    ElfW(auxv_t) *auxvec,
+#endif
+			    __typeof (main) init,
+			    void (*fini) (void),
+			    void (*rtld_fini) (void),
+			    void *stack_end)
+     __attribute__ ((noreturn));
+
+
+/* Note: the fini parameter is ignored here for shared library.  It
+   is registered with __cxa_atexit.  This had the disadvantage that
+   finalizers were called in more than one place.  */
+STATIC int
+LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
+		 int argc, char **argv,
+#ifdef LIBC_START_MAIN_AUXVEC_ARG
+		 ElfW(auxv_t) *auxvec,
+#endif
+		 __typeof (main) init,
+		 void (*fini) (void),
+		 void (*rtld_fini) (void), void *stack_end)
+{
+  /* Result of the 'main' function.  */
+  int result;
+
+  __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
+
+#ifndef SHARED
+  char **ev = &argv[argc + 1];
+
+  __environ = ev;
+
+  /* Store the lowest stack address.  This is done in ld.so if this is
+     the code for the DSO.  */
+  __libc_stack_end = stack_end;
+
+# ifdef HAVE_AUX_VECTOR
+  /* First process the auxiliary vector since we need to find the
+     program header to locate an eventually present PT_TLS entry.  */
+#  ifndef LIBC_START_MAIN_AUXVEC_ARG
+  ElfW(auxv_t) *auxvec;
+  {
+    char **evp = ev;
+    while (*evp++ != NULL)
+      ;
+    auxvec = (ElfW(auxv_t) *) evp;
+  }
+#  endif
+  _dl_aux_init (auxvec);
+  if (GL(dl_phdr) == NULL)
+# endif
+    {
+      /* Starting from binutils-2.23, the linker will define the
+         magic symbol __ehdr_start to point to our own ELF header
+         if it is visible in a segment that also includes the phdrs.
+         So we can set up _dl_phdr and _dl_phnum even without any
+         information from auxv.  */
+
+      extern const ElfW(Ehdr) __ehdr_start
+	__attribute__ ((weak, visibility ("hidden")));
+      if (&__ehdr_start != NULL)
+        {
+          assert (__ehdr_start.e_phentsize == sizeof *GL(dl_phdr));
+          GL(dl_phdr) = (const void *) &__ehdr_start + __ehdr_start.e_phoff;
+          GL(dl_phnum) = __ehdr_start.e_phnum;
+        }
+    }
+
+# ifdef DL_SYSDEP_OSCHECK
+  if (!__libc_multiple_libcs)
+    {
+      /* This needs to run to initiliaze _dl_osversion before TLS
+	 setup might check it.  */
+      DL_SYSDEP_OSCHECK (__libc_fatal);
+    }
+# endif
+
+  /* Perform IREL{,A} relocations.  */
+  apply_irel ();
+
+  /* Initialize the thread library at least a bit since the libgcc
+     functions are using thread functions if these are available and
+     we need to setup errno.  */
+  __pthread_initialize_minimal ();
+
+  /* Set up the stack checker's canary.  */
+  uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random);
+# ifdef THREAD_SET_STACK_GUARD
+  THREAD_SET_STACK_GUARD (stack_chk_guard);
+# else
+  __stack_chk_guard = stack_chk_guard;
+# endif
+
+  /* Set up the pointer guard value.  */
+  uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random,
+							 stack_chk_guard);
+# ifdef THREAD_SET_POINTER_GUARD
+  THREAD_SET_POINTER_GUARD (pointer_chk_guard);
+# else
+  __pointer_chk_guard_local = pointer_chk_guard;
+# endif
+
+#endif
+
+  /* Register the destructor of the dynamic linker if there is any.  */
+  if (__glibc_likely (rtld_fini != NULL))
+    __cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
+
+#ifndef SHARED
+  /* Call the initializer of the libc.  This is only needed here if we
+     are compiling for the static library in which case we haven't
+     run the constructors in `_dl_start_user'.  */
+  __libc_init_first (argc, argv, __environ);
+
+  /* Register the destructor of the program, if any.  */
+  if (fini)
+    __cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
+
+  /* Some security at this point.  Prevent starting a SUID binary where
+     the standard file descriptors are not opened.  We have to do this
+     only for statically linked applications since otherwise the dynamic
+     loader did the work already.  */
+  if (__builtin_expect (__libc_enable_secure, 0))
+    __libc_check_standard_fds ();
+#endif
+
+  /* Call the initializer of the program, if any.  */
+#ifdef SHARED
+  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
+    GLRO(dl_debug_printf) ("\ninitialize program: %s\n\n", argv[0]);
+#endif
+  if (init)
+    (*init) (argc, argv, __environ MAIN_AUXVEC_PARAM);
+
+#ifdef SHARED
+  /* Auditing checkpoint: we have a new object.  */
+  if (__glibc_unlikely (GLRO(dl_naudit) > 0))
+    {
+      struct audit_ifaces *afct = GLRO(dl_audit);
+      struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
+      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+	{
+	  if (afct->preinit != NULL)
+	    afct->preinit (&head->l_audit[cnt].cookie);
+
+	  afct = afct->next;
+	}
+    }
+#endif
+
+#ifdef SHARED
+  if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
+    GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
+#endif
+
+#ifndef SHARED
+  _dl_debug_initialize (0, LM_ID_BASE);
+#endif
+#ifdef HAVE_CLEANUP_JMP_BUF
+  /* Memory for the cancellation buffer.  */
+  struct pthread_unwind_buf unwind_buf;
+
+  int not_first_call;
+  not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
+  if (__glibc_likely (! not_first_call))
+    {
+      struct pthread *self = THREAD_SELF;
+
+      /* Store old info.  */
+      unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
+      unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
+
+      /* Store the new cleanup handler info.  */
+      THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
+
+      /* Run the program.  */
+      result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
+    }
+  else
+    {
+      /* Remove the thread-local data.  */
+# ifdef SHARED
+      PTHFCT_CALL (ptr__nptl_deallocate_tsd, ());
+# else
+      extern void __nptl_deallocate_tsd (void) __attribute ((weak));
+      __nptl_deallocate_tsd ();
+# endif
+
+      /* One less thread.  Decrement the counter.  If it is zero we
+	 terminate the entire process.  */
+      result = 0;
+# ifdef SHARED
+      unsigned int *ptr = __libc_pthread_functions.ptr_nthreads;
+#  ifdef PTR_DEMANGLE
+      PTR_DEMANGLE (ptr);
+#  endif
+# else
+      extern unsigned int __nptl_nthreads __attribute ((weak));
+      unsigned int *const ptr = &__nptl_nthreads;
+# endif
+
+      if (! atomic_decrement_and_test (ptr))
+	/* Not much left to do but to exit the thread, not the process.  */
+	__exit_thread ();
+    }
+#else
+  /* Nothing fancy, just call the function.  */
+  result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
+#endif
+
+  exit (result);
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/libc-tls.c b/ap/libc/glibc/glibc-2.23/csu/libc-tls.c
new file mode 100644
index 0000000..d6425e0
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/libc-tls.c
@@ -0,0 +1,245 @@
+/* Initialization code for TLS in statically linked application.
+   Copyright (C) 2002-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <ldsodefs.h>
+#include <tls.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/param.h>
+
+
+#ifdef SHARED
+ #error makefile bug, this file is for static only
+#endif
+
+dtv_t _dl_static_dtv[2 + TLS_SLOTINFO_SURPLUS];
+
+
+static struct
+{
+  struct dtv_slotinfo_list si;
+  /* The dtv_slotinfo_list data structure does not include the actual
+     information since it is defined as an array of size zero.  We define
+     here the necessary entries.  Note that it is not important whether
+     there is padding or not since we will always access the information
+     through the 'si' element.  */
+  struct dtv_slotinfo info[2 + TLS_SLOTINFO_SURPLUS];
+} static_slotinfo;
+
+
+/* Highest dtv index currently needed.  */
+size_t _dl_tls_max_dtv_idx;
+/* Flag signalling whether there are gaps in the module ID allocation.  */
+bool _dl_tls_dtv_gaps;
+/* Information about the dtv slots.  */
+struct dtv_slotinfo_list *_dl_tls_dtv_slotinfo_list;
+/* Number of modules in the static TLS block.  */
+size_t _dl_tls_static_nelem;
+/* Size of the static TLS block.  Giving this initialized value
+   preallocates some surplus bytes in the static TLS area.  */
+size_t _dl_tls_static_size = 2048;
+/* Size actually allocated in the static TLS block.  */
+size_t _dl_tls_static_used;
+/* Alignment requirement of the static TLS block.  */
+size_t _dl_tls_static_align;
+
+/* Generation counter for the dtv.  */
+size_t _dl_tls_generation;
+
+
+/* Additional definitions needed by TLS initialization.  */
+#ifdef TLS_INIT_HELPER
+TLS_INIT_HELPER
+#endif
+
+static void
+init_slotinfo (void)
+{
+  /* Create the slotinfo list.  */
+  static_slotinfo.si.len = (((char *) (&static_slotinfo + 1)
+			     - (char *) &static_slotinfo.si.slotinfo[0])
+			    / sizeof static_slotinfo.si.slotinfo[0]);
+  // static_slotinfo.si.next = NULL;	already zero
+
+  /* The slotinfo list.  Will be extended by the code doing dynamic
+     linking.  */
+  GL(dl_tls_max_dtv_idx) = 1;
+  GL(dl_tls_dtv_slotinfo_list) = &static_slotinfo.si;
+}
+
+static void
+init_static_tls (size_t memsz, size_t align)
+{
+  /* That is the size of the TLS memory for this object.  The initialized
+     value of _dl_tls_static_size is provided by dl-open.c to request some
+     surplus that permits dynamic loading of modules with IE-model TLS.  */
+  GL(dl_tls_static_size) = roundup (memsz + GL(dl_tls_static_size),
+				    TLS_TCB_ALIGN);
+#if TLS_TCB_AT_TP
+  GL(dl_tls_static_size) += TLS_TCB_SIZE;
+#endif
+  GL(dl_tls_static_used) = memsz;
+  /* The alignment requirement for the static TLS block.  */
+  GL(dl_tls_static_align) = align;
+  /* Number of elements in the static TLS block.  */
+  GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx);
+}
+
+void
+__libc_setup_tls (size_t tcbsize, size_t tcbalign)
+{
+  void *tlsblock;
+  size_t memsz = 0;
+  size_t filesz = 0;
+  void *initimage = NULL;
+  size_t align = 0;
+  size_t max_align = tcbalign;
+  size_t tcb_offset;
+  const ElfW(Phdr) *phdr;
+
+  /* Look through the TLS segment if there is any.  */
+  if (_dl_phdr != NULL)
+    for (phdr = _dl_phdr; phdr < &_dl_phdr[_dl_phnum]; ++phdr)
+      if (phdr->p_type == PT_TLS)
+	{
+	  /* Remember the values we need.  */
+	  memsz = phdr->p_memsz;
+	  filesz = phdr->p_filesz;
+	  initimage = (void *) phdr->p_vaddr;
+	  align = phdr->p_align;
+	  if (phdr->p_align > max_align)
+	    max_align = phdr->p_align;
+	  break;
+	}
+
+  /* We have to set up the TCB block which also (possibly) contains
+     'errno'.  Therefore we avoid 'malloc' which might touch 'errno'.
+     Instead we use 'sbrk' which would only uses 'errno' if it fails.
+     In this case we are right away out of memory and the user gets
+     what she/he deserves.
+
+     The initialized value of _dl_tls_static_size is provided by dl-open.c
+     to request some surplus that permits dynamic loading of modules with
+     IE-model TLS.  */
+#if TLS_TCB_AT_TP
+  /* Align the TCB offset to the maximum alignment, as
+     _dl_allocate_tls_storage (in elf/dl-tls.c) does using __libc_memalign
+     and dl_tls_static_align.  */
+  tcb_offset = roundup (memsz + GL(dl_tls_static_size), max_align);
+  tlsblock = __sbrk (tcb_offset + tcbsize + max_align);
+#elif TLS_DTV_AT_TP
+  tcb_offset = roundup (tcbsize, align ?: 1);
+  tlsblock = __sbrk (tcb_offset + memsz + max_align
+		     + TLS_PRE_TCB_SIZE + GL(dl_tls_static_size));
+  tlsblock += TLS_PRE_TCB_SIZE;
+#else
+  /* In case a model with a different layout for the TCB and DTV
+     is defined add another #elif here and in the following #ifs.  */
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+#endif
+
+  /* Align the TLS block.  */
+  tlsblock = (void *) (((uintptr_t) tlsblock + max_align - 1)
+		       & ~(max_align - 1));
+
+  /* Initialize the dtv.  [0] is the length, [1] the generation counter.  */
+  _dl_static_dtv[0].counter = (sizeof (_dl_static_dtv) / sizeof (_dl_static_dtv[0])) - 2;
+  // _dl_static_dtv[1].counter = 0;		would be needed if not already done
+
+  struct link_map *main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
+
+  /* Initialize the TLS block.  */
+#if TLS_TCB_AT_TP
+  _dl_static_dtv[2].pointer.val = ((char *) tlsblock + tcb_offset
+			       - roundup (memsz, align ?: 1));
+  main_map->l_tls_offset = roundup (memsz, align ?: 1);
+#elif TLS_DTV_AT_TP
+  _dl_static_dtv[2].pointer.val = (char *) tlsblock + tcb_offset;
+  main_map->l_tls_offset = tcb_offset;
+#else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+#endif
+  _dl_static_dtv[2].pointer.is_static = true;
+  /* sbrk gives us zero'd memory, so we don't need to clear the remainder.  */
+  memcpy (_dl_static_dtv[2].pointer.val, initimage, filesz);
+
+  /* Install the pointer to the dtv.  */
+
+  /* Initialize the thread pointer.  */
+#if TLS_TCB_AT_TP
+  INSTALL_DTV ((char *) tlsblock + tcb_offset, _dl_static_dtv);
+
+  const char *lossage = TLS_INIT_TP ((char *) tlsblock + tcb_offset);
+#elif TLS_DTV_AT_TP
+  INSTALL_DTV (tlsblock, _dl_static_dtv);
+  const char *lossage = TLS_INIT_TP (tlsblock);
+#else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+#endif
+  if (__builtin_expect (lossage != NULL, 0))
+    __libc_fatal (lossage);
+
+  /* Update the executable's link map with enough information to make
+     the TLS routines happy.  */
+  main_map->l_tls_align = align;
+  main_map->l_tls_blocksize = memsz;
+  main_map->l_tls_initimage = initimage;
+  main_map->l_tls_initimage_size = filesz;
+  main_map->l_tls_modid = 1;
+
+  init_slotinfo ();
+  // static_slotinfo.si.slotinfo[1].gen = 0; already zero
+  static_slotinfo.si.slotinfo[1].map = main_map;
+
+  memsz = roundup (memsz, align ?: 1);
+
+#if TLS_DTV_AT_TP
+  memsz += tcb_offset;
+#endif
+
+  init_static_tls (memsz, MAX (TLS_TCB_ALIGN, max_align));
+}
+
+/* This is called only when the data structure setup was skipped at startup,
+   when there was no need for it then.  Now we have dynamically loaded
+   something needing TLS, or libpthread needs it.  */
+int
+internal_function
+_dl_tls_setup (void)
+{
+  init_slotinfo ();
+  init_static_tls (
+#if TLS_TCB_AT_TP
+		   TLS_TCB_SIZE,
+#else
+		   0,
+#endif
+		   TLS_TCB_ALIGN);
+  return 0;
+}
+
+
+/* This is the minimal initialization function used when libpthread is
+   not used.  */
+void
+__attribute__ ((weak))
+__pthread_initialize_minimal (void)
+{
+  __libc_setup_tls (TLS_INIT_TCB_SIZE, TLS_INIT_TCB_ALIGN);
+}
diff --git a/ap/libc/glibc/glibc-2.23/csu/start.c b/ap/libc/glibc/glibc-2.23/csu/start.c
new file mode 100644
index 0000000..d7d7a85
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/start.c
@@ -0,0 +1,11 @@
+/* This file should define the low-level program entry point,
+   which should set up `__environ', and then do:
+     __libc_init(argc, argv, __environ);
+     exit(main(argc, argv, __environ));
+
+   This file should be prepared to be the first thing in the text section (on
+   Unix systems), or otherwise appropriately special.  */
+
+/* The first piece of initialized data.  */
+int __data_start = 0;
+weak_alias (__data_start, data_start)
diff --git a/ap/libc/glibc/glibc-2.23/csu/sysdep.c b/ap/libc/glibc/glibc-2.23/csu/sysdep.c
new file mode 100644
index 0000000..5442eee
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/sysdep.c
@@ -0,0 +1,2 @@
+/* This file should contain any system-dependent functions
+   that will be used by many parts of the library.  */
diff --git a/ap/libc/glibc/glibc-2.23/csu/tst-atomic-long.c b/ap/libc/glibc/glibc-2.23/csu/tst-atomic-long.c
new file mode 100644
index 0000000..6b62299
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/tst-atomic-long.c
@@ -0,0 +1,27 @@
+/* Tests for atomic.h macros.
+   Copyright (C) 2003-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <bits/wordsize.h>
+
+#define atomic_t long
+#if __WORDSIZE == 64
+# define TEST_ATOMIC64 1
+#endif
+
+#include "tst-atomic.c"
diff --git a/ap/libc/glibc/glibc-2.23/csu/tst-atomic.c b/ap/libc/glibc/glibc-2.23/csu/tst-atomic.c
new file mode 100644
index 0000000..f7dcac1
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/tst-atomic.c
@@ -0,0 +1,640 @@
+/* Tests for atomic.h macros.
+   Copyright (C) 2003-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <atomic.h>
+
+#ifndef atomic_t
+# define atomic_t int
+#endif
+
+/* Test various atomic.h macros.  */
+static int
+do_test (void)
+{
+  atomic_t mem, expected;
+  int ret = 0;
+
+#ifdef atomic_compare_and_exchange_val_acq
+  mem = 24;
+  if (atomic_compare_and_exchange_val_acq (&mem, 35, 24) != 24
+      || mem != 35)
+    {
+      puts ("atomic_compare_and_exchange_val_acq test 1 failed");
+      ret = 1;
+    }
+
+  mem = 12;
+  if (atomic_compare_and_exchange_val_acq (&mem, 10, 15) != 12
+      || mem != 12)
+    {
+      puts ("atomic_compare_and_exchange_val_acq test 2 failed");
+      ret = 1;
+    }
+
+  mem = -15;
+  if (atomic_compare_and_exchange_val_acq (&mem, -56, -15) != -15
+      || mem != -56)
+    {
+      puts ("atomic_compare_and_exchange_val_acq test 3 failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  if (atomic_compare_and_exchange_val_acq (&mem, 17, 0) != -1
+      || mem != -1)
+    {
+      puts ("atomic_compare_and_exchange_val_acq test 4 failed");
+      ret = 1;
+    }
+#endif
+
+  mem = 24;
+  if (atomic_compare_and_exchange_bool_acq (&mem, 35, 24)
+      || mem != 35)
+    {
+      puts ("atomic_compare_and_exchange_bool_acq test 1 failed");
+      ret = 1;
+    }
+
+  mem = 12;
+  if (! atomic_compare_and_exchange_bool_acq (&mem, 10, 15)
+      || mem != 12)
+    {
+      puts ("atomic_compare_and_exchange_bool_acq test 2 failed");
+      ret = 1;
+    }
+
+  mem = -15;
+  if (atomic_compare_and_exchange_bool_acq (&mem, -56, -15)
+      || mem != -56)
+    {
+      puts ("atomic_compare_and_exchange_bool_acq test 3 failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  if (! atomic_compare_and_exchange_bool_acq (&mem, 17, 0)
+      || mem != -1)
+    {
+      puts ("atomic_compare_and_exchange_bool_acq test 4 failed");
+      ret = 1;
+    }
+
+  mem = 64;
+  if (atomic_exchange_acq (&mem, 31) != 64
+      || mem != 31)
+    {
+      puts ("atomic_exchange_acq test failed");
+      ret = 1;
+    }
+
+  mem = 2;
+  if (atomic_exchange_and_add (&mem, 11) != 2
+      || mem != 13)
+    {
+      puts ("atomic_exchange_and_add test failed");
+      ret = 1;
+    }
+
+  mem = 2;
+  if (atomic_exchange_and_add_acq (&mem, 11) != 2
+      || mem != 13)
+    {
+      puts ("atomic_exchange_and_add test failed");
+      ret = 1;
+    }
+
+  mem = 2;
+  if (atomic_exchange_and_add_rel (&mem, 11) != 2
+      || mem != 13)
+    {
+      puts ("atomic_exchange_and_add test failed");
+      ret = 1;
+    }
+
+  mem = -21;
+  atomic_add (&mem, 22);
+  if (mem != 1)
+    {
+      puts ("atomic_add test failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  atomic_increment (&mem);
+  if (mem != 0)
+    {
+      puts ("atomic_increment test failed");
+      ret = 1;
+    }
+
+  mem = 2;
+  if (atomic_increment_val (&mem) != 3)
+    {
+      puts ("atomic_increment_val test failed");
+      ret = 1;
+    }
+
+  mem = 0;
+  if (atomic_increment_and_test (&mem)
+      || mem != 1)
+    {
+      puts ("atomic_increment_and_test test 1 failed");
+      ret = 1;
+    }
+
+  mem = 35;
+  if (atomic_increment_and_test (&mem)
+      || mem != 36)
+    {
+      puts ("atomic_increment_and_test test 2 failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  if (! atomic_increment_and_test (&mem)
+      || mem != 0)
+    {
+      puts ("atomic_increment_and_test test 3 failed");
+      ret = 1;
+    }
+
+  mem = 17;
+  atomic_decrement (&mem);
+  if (mem != 16)
+    {
+      puts ("atomic_decrement test failed");
+      ret = 1;
+    }
+
+  if (atomic_decrement_val (&mem) != 15)
+    {
+      puts ("atomic_decrement_val test failed");
+      ret = 1;
+    }
+
+  mem = 0;
+  if (atomic_decrement_and_test (&mem)
+      || mem != -1)
+    {
+      puts ("atomic_decrement_and_test test 1 failed");
+      ret = 1;
+    }
+
+  mem = 15;
+  if (atomic_decrement_and_test (&mem)
+      || mem != 14)
+    {
+      puts ("atomic_decrement_and_test test 2 failed");
+      ret = 1;
+    }
+
+  mem = 1;
+  if (! atomic_decrement_and_test (&mem)
+      || mem != 0)
+    {
+      puts ("atomic_decrement_and_test test 3 failed");
+      ret = 1;
+    }
+
+  mem = 1;
+  if (atomic_decrement_if_positive (&mem) != 1
+      || mem != 0)
+    {
+      puts ("atomic_decrement_if_positive test 1 failed");
+      ret = 1;
+    }
+
+  mem = 0;
+  if (atomic_decrement_if_positive (&mem) != 0
+      || mem != 0)
+    {
+      puts ("atomic_decrement_if_positive test 2 failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  if (atomic_decrement_if_positive (&mem) != -1
+      || mem != -1)
+    {
+      puts ("atomic_decrement_if_positive test 3 failed");
+      ret = 1;
+    }
+
+  mem = -12;
+  if (! atomic_add_negative (&mem, 10)
+      || mem != -2)
+    {
+      puts ("atomic_add_negative test 1 failed");
+      ret = 1;
+    }
+
+  mem = 0;
+  if (atomic_add_negative (&mem, 100)
+      || mem != 100)
+    {
+      puts ("atomic_add_negative test 2 failed");
+      ret = 1;
+    }
+
+  mem = 15;
+  if (atomic_add_negative (&mem, -10)
+      || mem != 5)
+    {
+      puts ("atomic_add_negative test 3 failed");
+      ret = 1;
+    }
+
+  mem = -12;
+  if (atomic_add_negative (&mem, 14)
+      || mem != 2)
+    {
+      puts ("atomic_add_negative test 4 failed");
+      ret = 1;
+    }
+
+  mem = 0;
+  if (! atomic_add_negative (&mem, -1)
+      || mem != -1)
+    {
+      puts ("atomic_add_negative test 5 failed");
+      ret = 1;
+    }
+
+  mem = -31;
+  if (atomic_add_negative (&mem, 31)
+      || mem != 0)
+    {
+      puts ("atomic_add_negative test 6 failed");
+      ret = 1;
+    }
+
+  mem = -34;
+  if (atomic_add_zero (&mem, 31)
+      || mem != -3)
+    {
+      puts ("atomic_add_zero test 1 failed");
+      ret = 1;
+    }
+
+  mem = -36;
+  if (! atomic_add_zero (&mem, 36)
+      || mem != 0)
+    {
+      puts ("atomic_add_zero test 2 failed");
+      ret = 1;
+    }
+
+  mem = 113;
+  if (atomic_add_zero (&mem, -13)
+      || mem != 100)
+    {
+      puts ("atomic_add_zero test 3 failed");
+      ret = 1;
+    }
+
+  mem = -18;
+  if (atomic_add_zero (&mem, 20)
+      || mem != 2)
+    {
+      puts ("atomic_add_zero test 4 failed");
+      ret = 1;
+    }
+
+  mem = 10;
+  if (atomic_add_zero (&mem, -20)
+      || mem != -10)
+    {
+      puts ("atomic_add_zero test 5 failed");
+      ret = 1;
+    }
+
+  mem = 10;
+  if (! atomic_add_zero (&mem, -10)
+      || mem != 0)
+    {
+      puts ("atomic_add_zero test 6 failed");
+      ret = 1;
+    }
+
+  mem = 0;
+  atomic_bit_set (&mem, 1);
+  if (mem != 2)
+    {
+      puts ("atomic_bit_set test 1 failed");
+      ret = 1;
+    }
+
+  mem = 8;
+  atomic_bit_set (&mem, 3);
+  if (mem != 8)
+    {
+      puts ("atomic_bit_set test 2 failed");
+      ret = 1;
+    }
+
+#ifdef TEST_ATOMIC64
+  mem = 16;
+  atomic_bit_set (&mem, 35);
+  if (mem != 0x800000010LL)
+    {
+      puts ("atomic_bit_set test 3 failed");
+      ret = 1;
+    }
+#endif
+
+  mem = 0;
+  if (atomic_bit_test_set (&mem, 1)
+      || mem != 2)
+    {
+      puts ("atomic_bit_test_set test 1 failed");
+      ret = 1;
+    }
+
+  mem = 8;
+  if (! atomic_bit_test_set (&mem, 3)
+      || mem != 8)
+    {
+      puts ("atomic_bit_test_set test 2 failed");
+      ret = 1;
+    }
+
+#ifdef TEST_ATOMIC64
+  mem = 16;
+  if (atomic_bit_test_set (&mem, 35)
+      || mem != 0x800000010LL)
+    {
+      puts ("atomic_bit_test_set test 3 failed");
+      ret = 1;
+    }
+
+  mem = 0x100000000LL;
+  if (! atomic_bit_test_set (&mem, 32)
+      || mem != 0x100000000LL)
+    {
+      puts ("atomic_bit_test_set test 4 failed");
+      ret = 1;
+    }
+#endif
+
+#ifdef catomic_compare_and_exchange_val_acq
+  mem = 24;
+  if (catomic_compare_and_exchange_val_acq (&mem, 35, 24) != 24
+      || mem != 35)
+    {
+      puts ("catomic_compare_and_exchange_val_acq test 1 failed");
+      ret = 1;
+    }
+
+  mem = 12;
+  if (catomic_compare_and_exchange_val_acq (&mem, 10, 15) != 12
+      || mem != 12)
+    {
+      puts ("catomic_compare_and_exchange_val_acq test 2 failed");
+      ret = 1;
+    }
+
+  mem = -15;
+  if (catomic_compare_and_exchange_val_acq (&mem, -56, -15) != -15
+      || mem != -56)
+    {
+      puts ("catomic_compare_and_exchange_val_acq test 3 failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  if (catomic_compare_and_exchange_val_acq (&mem, 17, 0) != -1
+      || mem != -1)
+    {
+      puts ("catomic_compare_and_exchange_val_acq test 4 failed");
+      ret = 1;
+    }
+#endif
+
+  mem = 24;
+  if (catomic_compare_and_exchange_bool_acq (&mem, 35, 24)
+      || mem != 35)
+    {
+      puts ("catomic_compare_and_exchange_bool_acq test 1 failed");
+      ret = 1;
+    }
+
+  mem = 12;
+  if (! catomic_compare_and_exchange_bool_acq (&mem, 10, 15)
+      || mem != 12)
+    {
+      puts ("catomic_compare_and_exchange_bool_acq test 2 failed");
+      ret = 1;
+    }
+
+  mem = -15;
+  if (catomic_compare_and_exchange_bool_acq (&mem, -56, -15)
+      || mem != -56)
+    {
+      puts ("catomic_compare_and_exchange_bool_acq test 3 failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  if (! catomic_compare_and_exchange_bool_acq (&mem, 17, 0)
+      || mem != -1)
+    {
+      puts ("catomic_compare_and_exchange_bool_acq test 4 failed");
+      ret = 1;
+    }
+
+  mem = 2;
+  if (catomic_exchange_and_add (&mem, 11) != 2
+      || mem != 13)
+    {
+      puts ("catomic_exchange_and_add test failed");
+      ret = 1;
+    }
+
+  mem = -21;
+  catomic_add (&mem, 22);
+  if (mem != 1)
+    {
+      puts ("catomic_add test failed");
+      ret = 1;
+    }
+
+  mem = -1;
+  catomic_increment (&mem);
+  if (mem != 0)
+    {
+      puts ("catomic_increment test failed");
+      ret = 1;
+    }
+
+  mem = 2;
+  if (catomic_increment_val (&mem) != 3)
+    {
+      puts ("catomic_increment_val test failed");
+      ret = 1;
+    }
+
+  mem = 17;
+  catomic_decrement (&mem);
+  if (mem != 16)
+    {
+      puts ("catomic_decrement test failed");
+      ret = 1;
+    }
+
+  if (catomic_decrement_val (&mem) != 15)
+    {
+      puts ("catomic_decrement_val test failed");
+      ret = 1;
+    }
+
+  /* Tests for C11-like atomics.  */
+  mem = 11;
+  if (atomic_load_relaxed (&mem) != 11 || atomic_load_acquire (&mem) != 11)
+    {
+      puts ("atomic_load_{relaxed,acquire} test failed");
+      ret = 1;
+    }
+
+  atomic_store_relaxed (&mem, 12);
+  if (mem != 12)
+    {
+      puts ("atomic_store_relaxed test failed");
+      ret = 1;
+    }
+  atomic_store_release (&mem, 13);
+  if (mem != 13)
+    {
+      puts ("atomic_store_release test failed");
+      ret = 1;
+    }
+
+  mem = 14;
+  expected = 14;
+  if (!atomic_compare_exchange_weak_relaxed (&mem, &expected, 25)
+      || mem != 25 || expected != 14)
+    {
+      puts ("atomic_compare_exchange_weak_relaxed test 1 failed");
+      ret = 1;
+    }
+  if (atomic_compare_exchange_weak_relaxed (&mem, &expected, 14)
+      || mem != 25 || expected != 25)
+    {
+      puts ("atomic_compare_exchange_weak_relaxed test 2 failed");
+      ret = 1;
+    }
+  mem = 14;
+  expected = 14;
+  if (!atomic_compare_exchange_weak_acquire (&mem, &expected, 25)
+      || mem != 25 || expected != 14)
+    {
+      puts ("atomic_compare_exchange_weak_acquire test 1 failed");
+      ret = 1;
+    }
+  if (atomic_compare_exchange_weak_acquire (&mem, &expected, 14)
+      || mem != 25 || expected != 25)
+    {
+      puts ("atomic_compare_exchange_weak_acquire test 2 failed");
+      ret = 1;
+    }
+  mem = 14;
+  expected = 14;
+  if (!atomic_compare_exchange_weak_release (&mem, &expected, 25)
+      || mem != 25 || expected != 14)
+    {
+      puts ("atomic_compare_exchange_weak_release test 1 failed");
+      ret = 1;
+    }
+  if (atomic_compare_exchange_weak_release (&mem, &expected, 14)
+      || mem != 25 || expected != 25)
+    {
+      puts ("atomic_compare_exchange_weak_release test 2 failed");
+      ret = 1;
+    }
+
+  mem = 23;
+  if (atomic_exchange_acquire (&mem, 42) != 23 || mem != 42)
+    {
+      puts ("atomic_exchange_acquire test failed");
+      ret = 1;
+    }
+  mem = 23;
+  if (atomic_exchange_release (&mem, 42) != 23 || mem != 42)
+    {
+      puts ("atomic_exchange_release test failed");
+      ret = 1;
+    }
+
+  mem = 23;
+  if (atomic_fetch_add_relaxed (&mem, 1) != 23 || mem != 24)
+    {
+      puts ("atomic_fetch_add_relaxed test failed");
+      ret = 1;
+    }
+  mem = 23;
+  if (atomic_fetch_add_acquire (&mem, 1) != 23 || mem != 24)
+    {
+      puts ("atomic_fetch_add_acquire test failed");
+      ret = 1;
+    }
+  mem = 23;
+  if (atomic_fetch_add_release (&mem, 1) != 23 || mem != 24)
+    {
+      puts ("atomic_fetch_add_release test failed");
+      ret = 1;
+    }
+  mem = 23;
+  if (atomic_fetch_add_acq_rel (&mem, 1) != 23 || mem != 24)
+    {
+      puts ("atomic_fetch_add_acq_rel test failed");
+      ret = 1;
+    }
+
+  mem = 3;
+  if (atomic_fetch_and_acquire (&mem, 2) != 3 || mem != 2)
+    {
+      puts ("atomic_fetch_and_acquire test failed");
+      ret = 1;
+    }
+
+  mem = 4;
+  if (atomic_fetch_or_relaxed (&mem, 2) != 4 || mem != 6)
+    {
+      puts ("atomic_fetch_or_relaxed test failed");
+      ret = 1;
+    }
+  mem = 4;
+  if (atomic_fetch_or_acquire (&mem, 2) != 4 || mem != 6)
+    {
+      puts ("atomic_fetch_or_acquire test failed");
+      ret = 1;
+    }
+
+  /* This is a single-threaded test, so we can't test the effects of the
+     fences.  */
+  atomic_thread_fence_acquire ();
+  atomic_thread_fence_release ();
+  atomic_thread_fence_seq_cst ();
+
+  return ret;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/ap/libc/glibc/glibc-2.23/csu/tst-empty.c b/ap/libc/glibc/glibc-2.23/csu/tst-empty.c
new file mode 100644
index 0000000..e99468e
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/tst-empty.c
@@ -0,0 +1,9 @@
+/* The most useful C program known to man.  */
+static int
+do_test (void)
+{
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/ap/libc/glibc/glibc-2.23/csu/version.c b/ap/libc/glibc/glibc-2.23/csu/version.c
new file mode 100644
index 0000000..15aab34
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/csu/version.c
@@ -0,0 +1,74 @@
+/* Copyright (C) 1992-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "version.h"
+#include <tls.h>
+#include <libc-abis.h>
+#include <gnu/libc-version.h>
+
+static const char __libc_release[] = RELEASE;
+static const char __libc_version[] = VERSION;
+
+static const char banner[] =
+"GNU C Library "PKGVERSION RELEASE" release version "VERSION", by Roland McGrath et al.\n\
+Copyright (C) 2016 Free Software Foundation, Inc.\n\
+This is free software; see the source for copying conditions.\n\
+There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A\n\
+PARTICULAR PURPOSE.\n\
+Compiled by GNU CC version "__VERSION__".\n"
+#include "version-info.h"
+#ifdef LIBC_ABIS_STRING
+LIBC_ABIS_STRING
+#endif
+"For bug reporting instructions, please see:\n\
+"REPORT_BUGS_TO".\n";
+
+#include <unistd.h>
+
+extern void __libc_print_version (void);
+void
+__libc_print_version (void)
+{
+  __write (STDOUT_FILENO, banner, sizeof banner - 1);
+}
+
+extern const char *__gnu_get_libc_release (void);
+const char *
+__gnu_get_libc_release (void)
+{
+  return __libc_release;
+}
+weak_alias (__gnu_get_libc_release, gnu_get_libc_release)
+
+extern const char *__gnu_get_libc_version (void);
+const char *
+__gnu_get_libc_version (void)
+{
+  return __libc_version;
+}
+weak_alias (__gnu_get_libc_version, gnu_get_libc_version)
+
+/* This function is the entry point for the shared object.
+   Running the library as a program will get here.  */
+
+extern void __libc_main (void) __attribute__ ((noreturn));
+void
+__libc_main (void)
+{
+  __libc_print_version ();
+  _exit (0);
+}