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From: Adhemerval Zanella <azanella@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc/azanella/clang] stdio: Disable attribute (optimize) if
 compiler does not support it
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a9ae131d1a39f3beaa677472f01e168f55249844

commit a9ae131d1a39f3beaa677472f01e168f55249844
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Mar 24 15:54:10 2022 -0300

    stdio: Disable attribute (optimize) if compiler does not support it

Diff:
---
 stdio-common/tst-printf-bz18872.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/stdio-common/tst-printf-bz18872.sh b/stdio-common/tst-printf-bz18872.sh
index 8cf3dc6738..37e4d7b632 100644
--- a/stdio-common/tst-printf-bz18872.sh
+++ b/stdio-common/tst-printf-bz18872.sh
@@ -31,7 +31,13 @@ cat <<'EOF'
   Compile do_test without optimization: GCC 4.9/5.0/6.0 takes a long time
   to build this source. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67396  */
 
-__attribute__ ((optimize ("-O0")))
+#if __GNUC_PREREQ (4, 4) || __glibc_has_attribute (__optimize__)
+# define attribute_optimize(level) __attribute__ ((optimize (level)))
+#else
+# define attribute_optimize(level)
+#endif
+
+attribute_optimize ("-O0")
 int do_test (void)
 {
     mtrace ();