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authorSiddhesh Poyarekar <siddhesh@sourceware.org>2020-11-03 15:09:28 +0530
committerSiddhesh Poyarekar <siddhesh@sourceware.org>2020-11-05 10:02:10 +0530
commitdc274b141666766b8ef70992d887e3c0c5e41bed (patch)
treef6c94c06251e84766a709dcf94632506fb7bc3b5 /string/bits
parent9a99c682144bdbd40792ebf822fe9264e0376fb5 (diff)
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Remove __warn_memset_zero_len [BZ #25399]
Non-gcc compilers (clang and possibly other compilers that do not masquerade as gcc 5.0 or later) are unable to use __warn_memset_zero_len since the symbol is no longer available on glibc built with gcc 5.0 or later. While it was likely an oversight that caused this omission, the fact that it wasn't noticed until recently (when clang closed the gap on _FORTIFY_SUPPORT) that the symbol was missing. Given that both gcc and clang are capable of doing this check in the compiler, drop all remaining signs of __warn_memset_zero_len from glibc so that no more objects are built with this symbol in future.
Diffstat (limited to 'string/bits')
-rw-r--r--string/bits/string_fortified.h15
1 files changed, 0 insertions, 15 deletions
diff --git a/string/bits/string_fortified.h b/string/bits/string_fortified.h
index 309d0f3..c8d3051 100644
--- a/string/bits/string_fortified.h
+++ b/string/bits/string_fortified.h
@@ -22,11 +22,6 @@
# error "Never use <bits/string_fortified.h> directly; include <string.h> instead."
#endif
-#if !__GNUC_PREREQ (5,0)
-__warndecl (__warn_memset_zero_len,
- "memset used with constant zero length parameter; this could be due to transposed parameters");
-#endif
-
__fortify_function void *
__NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
size_t __len))
@@ -58,16 +53,6 @@ __NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
__fortify_function void *
__NTH (memset (void *__dest, int __ch, size_t __len))
{
- /* GCC-5.0 and newer implements these checks in the compiler, so we don't
- need them here. */
-#if !__GNUC_PREREQ (5,0)
- if (__builtin_constant_p (__len) && __len == 0
- && (!__builtin_constant_p (__ch) || __ch != 0))
- {
- __warn_memset_zero_len ();
- return __dest;
- }
-#endif
return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
}