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Martin Sebor 1626a1cfcd Add support for GCC 9 attribute copy. 
GCC 9 has gained an enhancement to help detect attribute mismatches
between alias declarations and their targets.  It consists of a new
warning, -Wattribute-alias, an enhancement to an existing warning,
-Wmissing-attributes, and a new attribute called copy.

The purpose of the warnings is to help identify either possible bugs
(an alias declared with more restrictive attributes than its target
promises) or optimization or diagnostic opportunities (an alias target
missing some attributes that it could be declared with that might
benefit analysis and code generation).  The purpose of the new
attribute is to easily apply (almost) the same set of attributes
to one declaration as those already present on another.

As expected (and intended) the enhancement triggers warnings for
many alias declarations in Glibc code.  This change, tested on
x86_64-linux, avoids all instances of the new warnings by making
use of the attribute where appropriate.  To fully benefit from
the enhancement Glibc will need to be compiled with
 -Wattribute-alias=2 and remaining warnings reviewed and dealt with
(there are a couple of thousand but most should be straightforward
to deal with).

ChangeLog:

	* include/libc-symbols.h (__attribute_copy__): Define macro unless
	it's already defined.
	(_strong_alias): Use __attribute_copy__.
	(_weak_alias,  __hidden_ver1,  __hidden_nolink2): Same.
	* misc/sys/cdefs.h (__attribute_copy__): New macro.
	* sysdeps/x86_64/multiarch/memchr.c (memchr): Use __attribute_copy__.
	* sysdeps/x86_64/multiarch/memcmp.c (memcmp): Same.
	* sysdeps/x86_64/multiarch/mempcpy.c (mempcpy): Same.
	* sysdeps/x86_64/multiarch/memset.c (memset): Same.
	* sysdeps/x86_64/multiarch/stpcpy.c (stpcpy): Same.
	* sysdeps/x86_64/multiarch/strcat.c (strcat): Same.
	* sysdeps/x86_64/multiarch/strchr.c (strchr): Same.
	* sysdeps/x86_64/multiarch/strcmp.c (strcmp): Same.
	* sysdeps/x86_64/multiarch/strcpy.c (strcpy): Same.
	* sysdeps/x86_64/multiarch/strcspn.c (strcspn): Same.
	* sysdeps/x86_64/multiarch/strlen.c (strlen): Same.
	* sysdeps/x86_64/multiarch/strncmp.c (strncmp): Same.
	* sysdeps/x86_64/multiarch/strncpy.c (strncpy): Same.
	* sysdeps/x86_64/multiarch/strnlen.c (strnlen): Same.
	* sysdeps/x86_64/multiarch/strpbrk.c (strpbrk): Same.
	* sysdeps/x86_64/multiarch/strrchr.c (strrchr): Same.
	* sysdeps/x86_64/multiarch/strspn.c (strspn): Same.
 		2018-11-09 17:24:12 -07:00
..
Makefile x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
bcopy.S Use IFUNC memmove/memset in x86-64 bcopy/bzero 2012-10-11 13:58:16 -07:00
ifunc-avx2.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-impl-list.c x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
ifunc-memcmp.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-memmove.h x86-64: Check Prefer_FSRM in ifunc-memmove.h 2018-05-21 16:54:59 -07:00
ifunc-memset.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-sse4_2.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-strcasecmp.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-unaligned-ssse3.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifunc-wmemset.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memchr-avx2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memchr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memchr.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
memcmp-avx2-movbe.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcmp-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcmp-sse4.S x86-64: Use _CET_NOTRACK in memcmp-sse4.S 2018-07-18 08:07:32 -07:00
memcmp-ssse3.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcmp.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
memcpy-ssse3-back.S x86-64: Use _CET_NOTRACK in memcpy-ssse3-back.S 2018-07-18 06:38:23 -07:00
memcpy-ssse3.S x86-64: Use _CET_NOTRACK in memcpy-ssse3.S 2018-07-18 06:39:46 -07:00
memcpy.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcpy_chk-nonshared.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcpy_chk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove-avx-unaligned-erms.S X86-64: Use non-temporal store in memcpy on large data 2016-04-12 08:10:47 -07:00
memmove-avx512-no-vzeroupper.S Don't write beyond destination in __mempcpy_avx512_no_vzeroupper (bug 23196) 2018-05-23 09:50:57 +02:00
memmove-avx512-unaligned-erms.S Require binutils 2.24 to build x86-64 glibc [BZ #20139] 2016-07-01 06:03:05 -07:00
memmove-sse2-unaligned-erms.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove-ssse3-back.S Improve 64bit memcpy/memmove for Atom, Core 2 and Core i7 2010-06-30 08:26:11 -07:00
memmove-ssse3.S Improve 64bit memcpy/memmove for Atom, Core 2 and Core i7 2010-06-30 08:26:11 -07:00
memmove-vec-unaligned-erms.S x86-64: Skip zero length in __mem[pcpy|move|set]_erms 2018-05-23 11:25:42 -07:00
memmove.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove_chk-nonshared.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove_chk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mempcpy.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
mempcpy_chk-nonshared.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mempcpy_chk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memrchr-avx2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memrchr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memrchr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memset-avx2-unaligned-erms.S x86-64: Optimize wmemset with SSE2/AVX2/AVX512 2017-06-05 11:09:59 -07:00
memset-avx512-no-vzeroupper.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memset-avx512-unaligned-erms.S x86-64: Optimize wmemset with SSE2/AVX2/AVX512 2017-06-05 11:09:59 -07:00
memset-sse2-unaligned-erms.S x86: Don't include <init-arch.h> in assembly codes 2018-08-03 08:05:00 -07:00
memset-vec-unaligned-erms.S x86-64: Skip zero length in __mem[pcpy|move|set]_erms 2018-05-23 11:25:42 -07:00
memset.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
memset_chk-nonshared.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memset_chk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rawmemchr-avx2.S x86-64: Optimize memchr/rawmemchr/wmemchr with SSE2/AVX2 2017-06-09 05:13:31 -07:00
rawmemchr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rawmemchr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sched_cpucount.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
stpcpy-sse2-unaligned.S Improved st{r,p}{,n}cpy for SSE2 and SSSE3 on x86-64 2011-06-24 15:14:22 -04:00
stpcpy-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
stpcpy-ssse3.S Improved st{r,p}{,n}cpy for SSE2 and SSSE3 on x86-64 2011-06-24 15:14:22 -04:00
stpcpy.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
stpncpy-c.c x86-64: Implement strcpy family IFUNC selectors in C 2017-06-12 09:06:09 -07:00
stpncpy-sse2-unaligned.S Improved st{r,p}{,n}cpy for SSE2 and SSSE3 on x86-64 2011-06-24 15:14:22 -04:00
stpncpy-ssse3.S Improved st{r,p}{,n}cpy for SSE2 and SSSE3 on x86-64 2011-06-24 15:14:22 -04:00
stpncpy.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcasecmp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcasecmp_l-avx.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcasecmp_l-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcasecmp_l-sse4_2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcasecmp_l-ssse3.S Fix x86-64 build without multiarch. 2010-08-14 14:56:32 -07:00
strcasecmp_l.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcat-sse2-unaligned.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcat-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcat-ssse3.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcat.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strchr-avx2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchr-sse2-no-bsf.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchr.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strchrnul-avx2.S x86-64: Optimize strchr/strchrnul/wcschr with AVX2 2017-06-09 05:42:29 -07:00
strchrnul-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchrnul.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcmp-avx2.S x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
strcmp-sse2-unaligned.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcmp-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcmp-sse4_2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcmp-sse42.S x86-64: Use _CET_NOTRACK in strcmp-sse42.S 2018-07-18 06:37:09 -07:00
strcmp-ssse3.S Remove NOT_IN_libc 2014-11-24 15:03:45 +05:30
strcmp.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strcpy-sse2-unaligned.S x86-64: Use _CET_NOTRACK in strcpy-sse2-unaligned.S 2018-07-18 06:33:06 -07:00
strcpy-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcpy-ssse3.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcpy.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strcspn-c.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcspn-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcspn.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strlen-avx2.S x86-64: Remove the unnecessary testl in strlen-avx2.S 2018-05-14 03:41:35 -07:00
strlen-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strlen.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strncase.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncase_l-avx.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncase_l-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncase_l-sse4_2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncase_l-ssse3.S Add optimized strncasecmp versions for x86-64. 2010-08-14 22:04:01 -07:00
strncase_l.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncat-c.c x86-64: Use IFUNC strncat inside libc.so 2018-05-16 09:04:35 -07:00
strncat-sse2-unaligned.S Improve 64 bit strcat functions with SSE2/SSSE3 2011-07-19 17:11:54 -04:00
strncat-ssse3.S Improve 64 bit strcat functions with SSE2/SSSE3 2011-07-19 17:11:54 -04:00
strncat.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strncmp-avx2.S x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
strncmp-sse2.S x86: Make strncmp usable from rtld 2018-06-12 15:00:33 +02:00
strncmp-sse4_2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncmp-ssse3.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncmp.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strncpy-c.c x86-64: Implement strcpy family IFUNC selectors in C 2017-06-12 09:06:09 -07:00
strncpy-sse2-unaligned.S Improved st{r,p}{,n}cpy for SSE2 and SSSE3 on x86-64 2011-06-24 15:14:22 -04:00
strncpy-ssse3.S Improved st{r,p}{,n}cpy for SSE2 and SSSE3 on x86-64 2011-06-24 15:14:22 -04:00
strncpy.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strnlen-avx2.S x86-64: Optimize strlen/strnlen/wcslen/wcsnlen with AVX2 2017-06-09 05:18:18 -07:00
strnlen-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strnlen.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strpbrk-c.c x86-64: Implement strcspn/strpbrk/strspn IFUNC selectors in C 2017-06-15 08:59:05 -07:00
strpbrk-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strpbrk.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strrchr-avx2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strrchr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strrchr.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strspn-c.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strspn-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strspn.c Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
strstr-sse2-unaligned.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strstr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-multiarch.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
varshift.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
varshift.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcschr-avx2.S x86-64: Optimize strchr/strchrnul/wcschr with AVX2 2017-06-09 05:42:29 -07:00
wcschr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcschr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcscmp-avx2.S x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcscmp-sse2.S x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcscmp.c x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcscpy-c.c Remove NOT_IN_libc 2014-11-24 15:03:45 +05:30
wcscpy-ssse3.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcscpy.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcslen-avx2.S x86-64: Optimize strlen/strnlen/wcslen/wcsnlen with AVX2 2017-06-09 05:18:18 -07:00
wcslen-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcslen.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcsncmp-avx2.S x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcsncmp-sse2.c x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcsncmp.c x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcsnlen-avx2.S x86-64: Optimize strlen/strnlen/wcslen/wcsnlen with AVX2 2017-06-09 05:18:18 -07:00
wcsnlen-c.c x86-64: Move wcsnlen.S to multiarch/wcsnlen-sse4_1.S 2017-06-06 06:12:32 -07:00
wcsnlen-sse4_1.S x86-64: Move wcsnlen.S to multiarch/wcsnlen-sse4_1.S 2017-06-06 06:12:32 -07:00
wcsnlen.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcsrchr-avx2.S x86-64: Optimize strrchr/wcsrchr with AVX2 2017-06-09 05:45:52 -07:00
wcsrchr-sse2.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcsrchr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemchr-avx2.S x86-64: Optimize memchr/rawmemchr/wmemchr with SSE2/AVX2 2017-06-09 05:13:31 -07:00
wmemchr-sse2.S x86-64: Optimize memchr/rawmemchr/wmemchr with SSE2/AVX2 2017-06-09 05:13:31 -07:00
wmemchr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemcmp-avx2-movbe.S x86-64: Optimize memcmp/wmemcmp with AVX2 and MOVBE 2017-06-05 12:52:55 -07:00
wmemcmp-c.c Remove NOT_IN_libc 2014-11-24 15:03:45 +05:30
wmemcmp-sse4.S Optimized memcmp and wmemcmp for x86-64 and x86-32 2011-10-15 11:10:08 -04:00
wmemcmp-ssse3.S Optimized memcmp and wmemcmp for x86-64 and x86-32 2011-10-15 11:10:08 -04:00
wmemcmp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemset.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemset_chk-nonshared.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemset_chk.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00