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authorJo-Philipp Wich <jow@openwrt.org>2011-01-02 01:14:45 +0000
committerJo-Philipp Wich <jow@openwrt.org>2011-01-02 01:14:45 +0000
commitc208b4a1027efb6b445e33ed50de6b1bd2fe7f16 (patch)
tree2bf262533e4178c538803efc4861f5dca0339e0c /tools/missing-macros/src/m4/as-compiler-flag.m4
parent3ef04d175516f7f29c6209653b7e3acd0705d953 (diff)
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missing-macros: add as-compiler-flag.m4 and as-version.m4
SVN-Revision: 24877
Diffstat (limited to 'tools/missing-macros/src/m4/as-compiler-flag.m4')
-rw-r--r--tools/missing-macros/src/m4/as-compiler-flag.m462
1 files changed, 62 insertions, 0 deletions
diff --git a/tools/missing-macros/src/m4/as-compiler-flag.m4 b/tools/missing-macros/src/m4/as-compiler-flag.m4
new file mode 100644
index 0000000000..0f660cf079
--- /dev/null
+++ b/tools/missing-macros/src/m4/as-compiler-flag.m4
@@ -0,0 +1,62 @@
+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"
+])
+