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-rw-r--r--m4/japhar_grep_cflags.m447
1 files changed, 47 insertions, 0 deletions
diff --git a/m4/japhar_grep_cflags.m4 b/m4/japhar_grep_cflags.m4
new file mode 100644
index 0000000..cf2ea4a
--- /dev/null
+++ b/m4/japhar_grep_cflags.m4
@@ -0,0 +1,47 @@
+dnl
+dnl JAPHAR_GREP_CFLAGS(flag, cmd_if_missing, cmd_if_present)
+dnl
+dnl From Japhar. Report changes to japhar@hungry.com
+dnl
+AC_DEFUN([JAPHAR_GREP_CFLAGS],
+[case "$CFLAGS" in
+"$1" | "$1 "* | *" $1" | *" $1 "* )
+ ifelse($#, 3, [$3], [:])
+ ;;
+*)
+ $2
+ ;;
+esac
+])
+
+dnl
+dnl Test for __attribute__ ((unused))
+dnl Based on code from the tcpdump version 3.7.2 source.
+dnl
+
+AC_DEFUN([AC_C___ATTRIBUTE__], [
+AC_MSG_CHECKING(for __attribute__)
+AC_CACHE_VAL(ac_cv___attribute__, [
+AC_TRY_COMPILE([
+#include <stdlib.h>
+static void foo (void) __attribute__ ((unused));
+
+static void
+foo (void)
+{
+ exit(1);
+}
+],
+[
+ exit (0);
+],
+ac_cv___attribute__=yes,
+ac_cv___attribute__=no)])
+if test "$ac_cv___attribute__" = "yes"; then
+ AC_DEFINE(UNUSED, __attribute__ ((unused)), [define if your compiler has __att
+ribute__ ((unused))])
+else
+ AC_DEFINE(UNUSED,,)
+fi
+AC_MSG_RESULT($ac_cv___attribute__)
+])