From 1d40170dd367831b97cbdb89ad1b7241a241923b Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Fri, 13 Dec 2024 05:59:59 +0800
Subject: [PATCH] Return EXIT_UNSUPPORTED if __builtin_mul_overflow unavailable
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Since GCC 4.9 doesn't support __builtin_mul_overflow:

tst-fd_to_filename.c: In function ‘check_ranges’:
tst-fd_to_filename.c:51:3: error: implicit declaration of function ‘__builtin_mul_overflow’ [-Werror=implicit-function-declaration]
   while (!__builtin_mul_overflow (power, base, &power));
   ^
cc1: all warnings being treated as errors

return EXIT_UNSUPPORTED for GCC 4.9 or older.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
---
 misc/tst-fd_to_filename.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/misc/tst-fd_to_filename.c b/misc/tst-fd_to_filename.c
index acbba69d69c..37b31034edc 100644
--- a/misc/tst-fd_to_filename.c
+++ b/misc/tst-fd_to_filename.c
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <fcntl.h>
+#if __GNUC_PREREQ (5, 0)
 #include <fd_to_filename.h>
 #include <stdio.h>
 #include <support/check.h>
@@ -99,3 +100,12 @@ do_test (void)
 }
 
 #include <support/test-driver.c>
+#else
+#include <support/test-driver.h>
+
+int
+main (void)
+{
+  return EXIT_UNSUPPORTED;
+}
+#endif
-- 
2.47.2