From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Thu, 24 Apr 2025 20:15:39 +0000 (-0300)
Subject: stdio: Fix test-printf-ldbl-compat.c build with ubsan
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=967c9fd3ebc14ae994b9ed428df503ea476cf801;p=thirdparty%2Fglibc.git

stdio: Fix test-printf-ldbl-compat.c build with ubsan

On powercp64le with --enable-ubsan the build fails with:

In file included from ../include/bits/stdio2.h:1,
                 from ../libio/stdio.h:967,
                 from ../include/stdio.h:14,
                 from ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c:21,
                 from ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ieee128.c:1:
In function ‘vfprintf’,
    inlined from ‘do_test_call_varg’ at ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c:56:3:
../libio/bits/stdio2.h:166:10: error: null format string [-Werror=format-overflow=]
  166 |   return __vfprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘vsnprintf’,
    inlined from ‘do_test_call_varg’ at ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c:68:3:
../libio/bits/stdio2.h:100:10: error: null format string [-Werror=format-truncation=]
  100 |   return __builtin___vsnprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  101 |                                     __glibc_objsize (__s), __fmt, __ap);
      |                                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘fprintf’,
    inlined from ‘do_test_call_rarg.constprop’ at ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c:104:3:
../libio/bits/stdio2.h:111:10: error: null format string [-Werror=format-overflow=]
  111 |   return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  112 |                         __va_arg_pack ());
      |                         ~~~~~~~~~~~~~~~~~
In function ‘printf’,
    inlined from ‘do_test_call_rarg.constprop’ at ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c:108:3:
../libio/bits/stdio2.h:118:10: error: null format string [-Werror=format-overflow=]
  118 |   return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘snprintf’,
    inlined from ‘do_test_call_rarg.constprop’ at ../sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c:112:3:
../libio/bits/stdio2.h:68:10: error: null format string [-Werror=format-truncation=]
   68 |   return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   69 |                                    __glibc_objsize (__s), __fmt,
      |                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   70 |                                    __va_arg_pack ());
      |                                    ~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
---

diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c b/sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c
index 0bd40c3aed..7276535106 100644
--- a/sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c
+++ b/sysdeps/ieee754/ldbl-128ibm-compat/test-printf-ldbl-compat.c
@@ -25,6 +25,7 @@
 #include <support/check.h>
 
 static void
+__attribute_disable_usbsan__
 do_test_call_varg (FILE *stream, const char *format, ...)
 {
   char *buffer = NULL;
@@ -79,6 +80,7 @@ do_test_call_varg (FILE *stream, const char *format, ...)
 }
 
 static void
+__attribute_disable_usbsan__
 do_test_call_rarg (FILE *stream, const char *format, long double ld, double d)
 {
   char *buffer = NULL;