| dnl as-compiler-flag.m4 0.1.0 |
| |
| dnl autostars m4 macro for detection of compiler flags |
| |
| dnl David Schleef <ds@schleef.org> |
| |
| dnl $Id: as-compiler-flag.m4,v 1.1 2005/12/15 23:35:19 ds Exp $ |
| |
| dnl AS_COMPILER_FLAG(CFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED]) |
| dnl Tries to compile with the given CFLAGS. |
| dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags, |
| dnl and ACTION-IF-NOT-ACCEPTED otherwise. |
| |
| AC_DEFUN([AS_COMPILER_FLAG], |
| [ |
| AC_MSG_CHECKING([to see if compiler understands $1]) |
| |
| save_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $1" |
| |
| AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no]) |
| CFLAGS="$save_CFLAGS" |
| |
| if test "X$flag_ok" = Xyes ; then |
| m4_ifvaln([$2],[$2]) |
| true |
| else |
| m4_ifvaln([$3],[$3]) |
| true |
| fi |
| AC_MSG_RESULT([$flag_ok]) |
| ]) |
| |
| dnl AS_COMPILER_FLAGS(VAR, FLAGS) |
| dnl Tries to compile with the given CFLAGS. |
| |
| AC_DEFUN([AS_COMPILER_FLAGS], |
| [ |
| list=$2 |
| flags_supported="" |
| flags_unsupported="" |
| AC_MSG_CHECKING([for supported compiler flags]) |
| for each in $list |
| do |
| save_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $each" |
| AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no]) |
| CFLAGS="$save_CFLAGS" |
| |
| if test "X$flag_ok" = Xyes ; then |
| flags_supported="$flags_supported $each" |
| else |
| flags_unsupported="$flags_unsupported $each" |
| fi |
| done |
| AC_MSG_RESULT([$flags_supported]) |
| if test "X$flags_unsupported" != X ; then |
| AC_MSG_WARN([unsupported compiler flags: $flags_unsupported]) |
| fi |
| $1="$$1 $flags_supported" |
| ]) |
| |