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glibc/misc
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Adhemerval Zanella c8ba52ab33 misc: Sync cdefs.h with gnulib 
It adds __glibc_has_builtin, __glibc_has_extension, and
__attribute_maybe_unused__ alongsize with some fixes.

The differences are:

--- glibc
+++ gnulib
@@ -259,7 +259,9 @@
 # define __attribute_const__ /* Ignore */
 #endif

-#if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
+#if defined __STDC_VERSION__ && 201710L < __STDC_VERSION__
+# define __attribute_maybe_unused__ [[__maybe_unused__]]
+#elif __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
 # define __attribute_maybe_unused__ __attribute__ ((__unused__))
 #else
 # define __attribute_maybe_unused__ /* Ignore */
@@ -485,7 +487,7 @@

 /* The #ifndef lets Gnulib avoid including these on non-glibc
    platforms, where the includes typically do not exist.  */
-#ifdef __GLIBC__
+#ifndef __WORDSIZE
 # include <bits/wordsize.h>
 # include <bits/long-double.h>
 #endif

The [[__attribute_maybe_unused__]] attribute removal __ is due Joseph
questioning gcc support with -std=c2x or -std=gnu2x [1].

The _WORDSIZE replacement by __GLIBC__ is because it does not play
well with internal cdefs.h that also uses
__LDOUBLE_REDIRECTS_TO_FLOAT128_ABI.

Checked on x86_64-linux-gnu.

[1] https://sourceware.org/pipermail/libc-alpha/2021-January/121600.html
2021-02-09 16:57:52 -03:00
..
bits Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sys misc: Sync cdefs.h with gnulib 2021-02-09 16:57:52 -03:00
acct.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
allocate_once.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ar.h Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
brk.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug18240.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
bug-hsearch1.c .. 2009-01-23 20:41:36 +00:00
chflags.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
chroot.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
daemon.c Remove internal usage of extensible stat functions 2020-09-11 14:35:32 -03:00
dirname.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
efgcvt_r-template.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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fd_to_filename.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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fstab.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
fstab.h Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
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getttyent.c Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463). 2018-02-21 18:01:11 +00:00
getusershell.c Remove internal usage of extensible stat functions 2020-09-11 14:35:32 -03:00
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mntent_r.c mntent: Use __putc_unlocked instead of fputc_unlocked 2021-01-08 21:02:12 +05:30
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revoke.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
sbrk.c Use hidden visibility for early static PIE code 2021-01-21 15:55:01 +00:00
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stab.h Update. 1997-06-21 02:59:26 +00:00
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syscall.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
syscall.h update from main archive 960107 1997-01-07 23:29:44 +00:00
sysexits.h Update. 1999-06-09 13:08:30 +00:00
syslog.c Correct locking and cancellation cleanup in syslog functions (bug 26100) 2020-08-18 11:27:03 +02:00
syslog.h initial import 1995-02-18 01:27:10 +00:00
truncate64.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
truncate.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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tst-efgcvt-template.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-empty.c Move all tests out of the csu subdirectory 2016-12-21 11:52:19 +01:00
tst-error1.c Split DIAG_* macros to new header libc-diag.h. 2017-02-25 09:59:46 -05:00
tst-fd_to_filename.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-fdset.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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tst-hsearch.c Modify several tests to use test-skeleton.c 2014-11-05 15:24:08 +05:30
tst-insremque.c [BZ #2766] 2006-06-17 17:01:42 +00:00
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tst-mntent2.c Fix warning in misc/tst-mntent2.c. 2014-12-16 10:27:16 +01:00
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tst-mntent-escape.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
tst-mntent.c getmntent: fix memory corruption w/blank lines [BZ #18887] 2015-08-29 18:07:00 -04:00
tst-preadvwritev2-common.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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tst-warn-wide.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
ttyent.h Remove pre-ISO C support 2012-01-07 23:57:22 -05:00
ttyslot.c As a minor cleanup remove the (r)index defines from include/string.h as 2017-02-06 18:15:18 +00:00
ualarm.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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Versions Add the __libc_single_threaded variable 2020-07-06 11:15:58 +02:00
vhangup.c Update copyright dates with scripts/update-copyrights 2021-01-02 12:17:34 -08:00
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