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Re: Option -pthread in test suite with cross compilers

From: Florian Weimer <fweimer at redhat dot com>
To: Dave Korn <dave dot korn dot cygwin at gmail dot com>
Cc: Hans-Peter Nilsson <hp at bitrange dot com>, Ralf Corsepius <ralf dot corsepius at rtems dot org>, Sebastian Huber <sebastian dot huber at embedded-brains dot de>, gcc at gcc dot gnu dot org
Date: Wed, 06 Jun 2012 15:14:05 +0200
Subject: Re: Option -pthread in test suite with cross compilers
References: <4FB5F922.3070205@embedded-brains.de> <4FB605FE.2030500@rtems.org> <alpine.BSF.2.00.1206022340570.29863@dair.pair.com> <4FCF5682.2010004@gmail.com>

On 06/06/2012 03:09 PM, Dave Korn wrote:

I am not sure, but AFAICT, -pthread is Linux-specific.
No, it's the canonical multi-os option to enable pthreads, as
generic as it gets.


   According to the manual(*), it's a machine-dependent option for RS6000 and
Solaris 2 only!

And there's a lot of confusion about whether you have to throw in -D_REENTRANT as well (on GNU/Linux and on other systems).

I think on GNU/Linux, pthread detection mostly happens at run time these days, and you ought to use the _r API variants (which are available without -pthread) in library code. I even think you shouldn't link against the library unless you actually create threads.


--
Florian Weimer / Red Hat Product Security Team

Follow-Ups:
- Re: Option -pthread in test suite with cross compilers
  - From: Jonathan Wakely

References:
- Re: Option -pthread in test suite with cross compilers
  - From: Hans-Peter Nilsson
- Re: Option -pthread in test suite with cross compilers
  - From: Dave Korn

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