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-rw-r--r--m4macros/detectcflags.m420
1 files changed, 20 insertions, 0 deletions
diff --git a/m4macros/detectcflags.m4 b/m4macros/detectcflags.m4
new file mode 100644
index 0000000..ee33456
--- /dev/null
+++ b/m4macros/detectcflags.m4
@@ -0,0 +1,20 @@
+dnl GIMP_DETECT_CFLAGS(RESULT, FLAGSET)
+dnl Detect if the compiler supports a set of flags
+
+AC_DEFUN([GIMP_DETECT_CFLAGS],
+[
+ $1=
+ for flag in $2; do
+ if test -z "[$]$1"; then
+ $1_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -Werror $flag"
+ AC_MSG_CHECKING([whether [$]CC understands [$]flag])
+ AC_TRY_COMPILE([], [], [$1_works=yes], [$1_works=no])
+ AC_MSG_RESULT([$]$1_works)
+ CFLAGS="[$]$1_save_CFLAGS"
+ if test "x[$]$1_works" = "xyes"; then
+ $1="$flag"
+ fi
+ fi
+ done
+])