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