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[Bug libc/21327] Libstdc++ would like another way to get some POSIX declarations that it currently gets via _GNU_SOURCE
- From: "jwakely.gcc at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 30 Oct 2017 13:33:15 +0000
- Subject: [Bug libc/21327] Libstdc++ would like another way to get some POSIX declarations that it currently gets via _GNU_SOURCE
- Auto-submitted: auto-generated
- References: <bug-21327-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21327
--- Comment #2 from Jonathan Wakely <jwakely.gcc at gmail dot com> ---
I forgot the following names that are used from <pthread.h> via libgcc's
<gthr-posix.h> header. These are declared unconditionally (even without
_GNU_SOURCE) but ideally libstdc++ wouldn't have to include <pthread.h> to use
these features:
pthread_once_t
PTHREAD_ONCE_INIT
pthread_once
pthread_cond_t
PTHREAD_COND_INITIALIZER
pthread_cond_timedwait
pthread_mutex_t
PTHREAD_MUTEX_INITIALIZER
PTHREAD_RECURSIVE_MUTEX_INITIALIZER
pthread_mutex_lock
pthread_mutex_trylock
pthread_mutex_unlock
On the other hand, I'm not terribly concerned if these names are visible. They
might not be reserved by the C++ standard, but users who expect to be able to
redefine these names for their own uses on a GNU/Linux system are probably not
sane.
I should also say that we use __locale_t from <locale.h>, as well as uselocale.
But that's in the implementation namespace so isn't a problem. If we just had
access to __locale_t and __uselocale that would be fine. The code that uses
freelocale and other APIs are compiled into libstdc++.so so we can use
_GNU_SOURCE there. Since __locale_t is an opaque type we could just declare it
ourselves without including <locale.h> if necessary:
typedef struct __locale_struct *__locale_t;
extern "C" __locale_t __uselocale(__locale_t);
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