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Re: On dropping -D_REENTRANT -D_THREAD_SAFE
From: |
Simon Josefsson |
Subject: |
Re: On dropping -D_REENTRANT -D_THREAD_SAFE |
Date: |
Sun, 06 Jan 2008 15:17:05 +0100 |
User-agent: |
Gnus/5.110007 (No Gnus v0.7) Emacs/22.1 (gnu/linux) |
Nikos Mavrogiannopoulos <address@hidden> writes:
> On Friday 04 January 2008, Simon Josefsson wrote:
>> For a long time configure.in has contained:
>>
>> dnl In order to use the reentrant libc functions.
>> dnl I hope it is portable enough.
>> CFLAGS="${CFLAGS} -D_REENTRANT -D_THREAD_SAFE"
>
> I believe these flags are used in solaris. Probably older systems
> require them too.
But does it have any effect for any functions we actually use?
libgnutls* uses very few POSIX/C89 functions that have thread-issues,
the only one I could find was that we use gmtime_r.
I checked on a solaris 5.10 machine, and the _REENTRANT symbol enables
prototypes for some functions like getlogin_r, ttyname_r, rand_r, and
actually also gmtime_r. However, the gmtime_r prototype, and most other
prototypes, are also always declared if !_STRICT_STDC:
#if defined(__EXTENSIONS__) || \
(!defined(_STRICT_STDC) && !defined(__XOPEN_OR_POSIX)) || \
(_POSIX_C_SOURCE - 0 >= 199506L) || defined(_REENTRANT)
extern struct tm *gmtime_r(const time_t *_RESTRICT_KYWD,
struct tm *_RESTRICT_KYWD);
So I think we are safe. To make sure, I'll build the latest daily
snapshot and build it on this machine now..
/Simon