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<sys/cdefs.h>: Inhibit macro expansion for __glibc_has_include

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This is currently ineffective with GCC because of GCC PR 80005, but
it makes sense to anticipate a fix for this defect.

Suggested by Zack Weinberg.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2019-06-14 15:46:02 +02:00
parent cf27468602
commit 8d141877e0
2 changed files with 9 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2019-06-14 Florian Weimer <fweimer@redhat.com>
* misc/sys/cdefs.h (__glibc_has_include): Do not use a
function-like macro, so that __has_include can inhibit expansion
of its argument.
2019-06-13 Joseph Myers <joseph@codesourcery.com> 2019-06-13 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/bits/in.h (IPV6_ROUTER_ALERT_ISOLATE): * sysdeps/unix/sysv/linux/bits/in.h (IPV6_ROUTER_ALERT_ISOLATE):

4
misc/sys/cdefs.h
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@ -413,7 +413,9 @@
#endif #endif
#ifdef __has_include #ifdef __has_include
# define __glibc_has_include(header) __has_include (header) /* Do not use a function-like macro, so that __has_include can inhibit
macro expansion. */
# define __glibc_has_include __has_include
#else #else
# define __glibc_has_include(header) 0 # define __glibc_has_include(header) 0
#endif #endif