[glibc/azanella/clang] Handle pragma GCC optimize for clang

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=92b07aa885131c0c5298afcda41ae8bde356a636

commit 92b07aa885131c0c5298afcda41ae8bde356a636
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Mar 24 16:17:59 2022 -0300

    Handle pragma GCC optimize for clang

Diff:
---
 libio/tst-bz24051.c  | 6 +++++-
 libio/tst-bz24153.c  | 6 +++++-
 malloc/tst-tcfree3.c | 6 +++++-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/libio/tst-bz24051.c b/libio/tst-bz24051.c
index f315525071..3649dbbdbd 100644
--- a/libio/tst-bz24051.c
+++ b/libio/tst-bz24051.c
@@ -19,7 +19,11 @@
 
 /* Prevent putchar -> _IO_putc inline expansion.  */
 #define __NO_INLINE__
-#pragma GCC optimize("O0")
+#ifdef __clang__
+# pragma clang optimize off
+#else
+# pragma GCC optimize("O0")
+#endif
 
 #include <stdio.h>
 #include <string.h>
diff --git a/libio/tst-bz24153.c b/libio/tst-bz24153.c
index a069bf0695..9cfaa3b83c 100644
--- a/libio/tst-bz24153.c
+++ b/libio/tst-bz24153.c
@@ -18,7 +18,11 @@
 
 /* Prevent getchar -> getc inline expansion.  */
 #define __NO_INLINE__
-#pragma GCC optimize ("O0")
+#ifdef __clang__
+# pragma clang optimize off
+#else
+# pragma GCC optimize("O0")
+#endif
 
 #include <stdarg.h>
 #include <stdio.h>
diff --git a/malloc/tst-tcfree3.c b/malloc/tst-tcfree3.c
index 3a3149b3b2..215134a9ae 100644
--- a/malloc/tst-tcfree3.c
+++ b/malloc/tst-tcfree3.c
@@ -20,7 +20,11 @@
 #include <string.h>
 
 /* Prevent GCC from optimizing away any malloc/free pairs.  */
-#pragma GCC optimize ("O0")
+#ifdef __clang__
+# pragma clang optimize off
+#else
+# pragma GCC optimize("O0")
+#endif
 
 static int
 do_test (void)