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1626a1cfcd
glibc/sysdeps/x86_64
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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
..
64
fpu Use trunc functions not __trunc functions in glibc libm. 2018-09-20 21:11:10 +00:00
multiarch Add support for GCC 9 attribute copy. 2018-11-09 17:24:12 -07:00
nptl x86: Rename __glibc_reserved2 to ssp_base in tcbhead_t 2018-07-25 04:39:39 -07:00
x32 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
____longjmp_chk.S
__longjmp.S x86: Support shadow stack pointer in setjmp/longjmp 2018-07-14 05:59:53 -07:00
_mcount.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
abort-instr.h
add_n.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
addmul_1.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bsd-_setjmp.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bsd-setjmp.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bzero.S
configure Add --enable-static-pie configure option to build static PIE [BZ #19574] 2017-12-15 17:12:14 -08:00
configure.ac Add --enable-static-pie configure option to build static PIE [BZ #19574] 2017-12-15 17:12:14 -08:00
crti.S x86: Add _CET_ENDBR to functions in crti.S 2018-07-17 16:05:18 -07:00
crtn.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-irel.h [BZ #20271] Add newlines in __libc_fatal calls. 2018-08-31 18:04:32 -07:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-machine.h elf: Unify symbol address run-time calculation [BZ #19818] 2018-04-04 23:09:37 +01:00
dl-procinfo.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-runtime.c
dl-tls.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tls.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tlsdesc.S x86: Add _CET_ENDBR to functions in dl-tlsdesc.S 2018-07-17 16:07:17 -07:00
dl-trampoline.h x86: Support IBT and SHSTK in Intel CET [BZ #21598] 2018-07-16 14:08:27 -07:00
dl-trampoline.S x86: Move STATE_SAVE_OFFSET/STATE_SAVE_MASK to sysdep.h 2018-08-06 06:25:43 -07:00
ffs.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ffsll.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
htonl.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifuncmain8.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ifuncmod8.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Implies
isa.h x86: Use _rdtsc intrinsic for HP_TIMING_NOW 2018-10-17 15:16:45 -07:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
l10nflist.c
ldbl2mpn.c
link-defines.sym
locale-defines.sym
localplt.data
lshift.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Makefile Rename the glibc.tune namespace to glibc.cpu 2018-08-02 23:49:19 +05:30
memchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcmp.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcopy.h
memcpy_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcpy.S
memmove_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mempcpy_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mempcpy.S
memrchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memset_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memset.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memusage.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mp_clz_tab.c
mul_1.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
preconfigure
preconfigure.ac
rawmemchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rshift.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rtld-offsets.sym
sched_cpucount.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setjmp.S x86: Support shadow stack pointer in setjmp/longjmp 2018-07-14 05:59:53 -07:00
stack-aliasing.h
stackguard-macros.h
stackinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
start.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
stpcpy.S
strcasecmp_l-nonascii.c
strcasecmp_l.S
strcasecmp.S
strcat.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchrnul.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcmp.S x86_64: Use _CET_NOTRACK in strcmp.S 2018-07-18 06:31:53 -07:00
strcpy.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcspn.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strlen.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strncase_l-nonascii.c
strncase_l.S
strncase.S
strncmp.S
strnlen.S
strpbrk.S
strrchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strspn.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sub_n.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
submul_1.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tls_get_addr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tls-macros.h
tlsdesc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tlsdesc.sym
tst-audit3.c
tst-audit4-aux.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-audit4.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-audit5.c
tst-audit6.c
tst-audit7.c
tst-audit10-aux.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-audit10.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-audit.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-auditmod3a.c
tst-auditmod3b.c
tst-auditmod4a.c
tst-auditmod4b.c
tst-auditmod5a.c
tst-auditmod5b.c
tst-auditmod6a.c
tst-auditmod6b.c
tst-auditmod6c.c
tst-auditmod7a.c
tst-auditmod7b.c
tst-auditmod10a.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-auditmod10b.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-avx512-aux.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-avx512.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-avx512mod.c
tst-avx-aux.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-avx.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-avxmod.c
tst-mallocalign1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-platform-1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-platformmod-1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-platformmod-2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-quad1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-quad1pie.c
tst-quad2.c
tst-quad2pie.c
tst-quadmod1.S x86-64: Add endbr64 to tst-quadmod[12].S 2018-07-24 05:12:14 -07:00
tst-quadmod1pie.S
tst-quadmod2.S x86-64: Add endbr64 to tst-quadmod[12].S 2018-07-24 05:12:14 -07:00
tst-quadmod2pie.S
tst-split-dynreloc.c
tst-split-dynreloc.lds
tst-sse.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-ssemod.c
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-x86_64-1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-x86_64mod-1.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Versions Move __fentry__ version definition to sysdeps/{i386,x86_64} 2018-08-10 09:07:44 +02:00
wcschr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcscmp.S x86-64: Optimize strcmp/wcscmp and strncmp/wcsncmp with AVX2 2018-06-01 16:32:43 -05:00
wcslen.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wcsrchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemset_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
wmemset.S
wordcopy.c