1 files changed, 26 insertions, 0 deletions
diff --git a/m4/fr_have_bounded_attribute.m4 b/m4/fr_have_bounded_attribute.m4
new file mode 100644
index 0000000..50c3305
--- /dev/null
+++ b/m4/fr_have_bounded_attribute.m4
@@ -0,0 +1,26 @@
+dnl #
+dnl #  Check if we have __attribute__((__bounded__)) (usually only OpenBSD with GCC)
+dnl #
+AC_DEFUN([FR_HAVE_BOUNDED_ATTRIBUTE],[
+  AC_CACHE_CHECK([for __attribute__((__bounded__)) support in compiler], [ax_cv_cc_bounded_attribute],[
+    CFLAGS_SAVED=$CFLAGS
+    CFLAGS="$CFLAGS -Werror"
+    AC_RUN_IFELSE(
+      [
+        AC_LANG_SOURCE([
+          void test(char *buff) __attribute__ ((__bounded__ (__string__, 1, 1)));
+          int main(int argc, char **argv) {
+            if ((argc < 0) || !argv) return 1; /* -Werror=unused-parameter */
+            return 0;
+          }
+        ])
+      ],
+      [ax_cv_cc_bounded_attribute=yes],
+      [ax_cv_cc_bounded_attribute=no]
+    )
+    CFLAGS="$CFLAGS_SAVED"
+  ])
+  if test "x$ax_cv_cc_bounded_attribute" = "xyes"; then
+    AC_DEFINE(HAVE_ATTRIBUTE_BOUNDED, 1, [Define if your compiler supports the __bounded__ attribute (usually OpenBSD gcc).])
+  fi
+])