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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
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bits
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sys
misc: Sync cdefs.h with gnulib
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acct.c
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allocate_once.c
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ar.h
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brk.c
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bug18240.c
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bug-hsearch1.c
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2009-01-23 20:41:36 +00:00
chflags.c
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chroot.c
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daemon.c
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dirname.c
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efgcvt_r-template.c
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fstab.c
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fstab.h
Remove pre-ISO C support
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fsync.c
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ftruncate64.c
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getttyent.c
Fix -Os getc_unlocked linknamespace, localplt issues (bug 15105, bug 19463).
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getusershell.c
Remove internal usage of extensible stat functions
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getxattr.c
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syscall.h
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sysexits.h
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syslog.c
Correct locking and cancellation cleanup in syslog functions (bug 26100)
2020-08-18 11:27:03 +02:00
syslog.h
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tst-empty.c
Move all tests out of the csu subdirectory
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tst-error1.c
Split DIAG_* macros to new header libc-diag.h.
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tst-hsearch.c
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tst-insremque.c
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tst-mntent2.c
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tst-mntent.c
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ttyent.h
Remove pre-ISO C support
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ttyslot.c
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Versions
Add the __libc_single_threaded variable
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