melunko@47: dnl as-compiler-flag.m4 0.1.0
melunko@47: 
melunko@47: dnl autostars m4 macro for detection of compiler flags
melunko@47: 
melunko@47: dnl David Schleef <ds@schleef.org>
melunko@47: 
melunko@47: dnl $Id: as-compiler-flag.m4,v 1.1 2005/06/18 18:02:46 burgerman Exp $
melunko@47: 
melunko@47: dnl AS_COMPILER_FLAG(CFLAGS, ACTION-IF-ACCEPTED, [ACTION-IF-NOT-ACCEPTED])
melunko@47: dnl Tries to compile with the given CFLAGS.
melunko@47: dnl Runs ACTION-IF-ACCEPTED if the compiler can compile with the flags,
melunko@47: dnl and ACTION-IF-NOT-ACCEPTED otherwise.
melunko@47: 
melunko@47: AC_DEFUN([AS_COMPILER_FLAG],
melunko@47: [
melunko@47:   AC_MSG_CHECKING([to see if compiler understands $1])
melunko@47: 
melunko@47:   save_CFLAGS="$CFLAGS"
melunko@47:   CFLAGS="$CFLAGS $1"
melunko@47: 
melunko@47:   AC_TRY_COMPILE([ ], [], [flag_ok=yes], [flag_ok=no])
melunko@47:   CFLAGS="$save_CFLAGS"
melunko@47: 
melunko@47:   if test "X$flag_ok" = Xyes ; then
melunko@47:     $2
melunko@47:     true
melunko@47:   else
melunko@47:     $3
melunko@47:     true
melunko@47:   fi
melunko@47:   AC_MSG_RESULT([$flag_ok])
melunko@47: ])