From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 19 Dec 2025 18:52:22 +0000 (-0300)
Subject: stdio: Fix tst-vfprintf-user-type on clang
X-Git-Tag: glibc-2.43~62
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc78f67ca122f77341ece4275e9b9a38349d9c37;p=thirdparty%2Fglibc.git

stdio: Fix tst-vfprintf-user-type on clang

The pointer alias comparison will be optimized away by the compiler,
so use an indirection point to prevent it (similar to
malloc/tst-malloc-aux.h).

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
---

diff --git a/stdio-common/tst-vfprintf-user-type.c b/stdio-common/tst-vfprintf-user-type.c
index 3fc98b30f1..3bcca88974 100644
--- a/stdio-common/tst-vfprintf-user-type.c
+++ b/stdio-common/tst-vfprintf-user-type.c
@@ -183,7 +183,9 @@ do_test (void)
 #else
   extern int asprintf_alias (char **, const char *, ...) __asm__ ("asprintf");
 #endif
-  TEST_VERIFY (asprintf_alias == asprintf);
+  static __typeof (asprintf) * volatile asprintf_indirect = asprintf;
+  TEST_VERIFY (asprintf_alias == asprintf_indirect);
+
   char *str = NULL;
   TEST_VERIFY (asprintf_alias (&str, "[[%P]]", 123L, 456.0) >= 0);
   TEST_COMPARE_STRING (str, "[[(123, 456.000000)]]");