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Re: How to make a 'pthread' program ?
From: |
Bob Friesenhahn |
Subject: |
Re: How to make a 'pthread' program ? |
Date: |
Mon, 2 Jan 2006 10:49:50 -0600 (CST) |
On Tue, 3 Jan 2006, Steven Woody wrote:
on linux, simplly adding a '-pthread' option to the command line gcc, i can
make a multi-thread c program. but if using automake, i only got many
undefined reference to pthread_xxx errors. i've already add the '-pthread'
to the myprogram_CFLAGS variable.
The '-pthread' option is a non-standard compiler extension which
causes different pre-processor definitions to be applied, and
different/additional libraries to be applied. You should not assume
that other compilers/platforms work with '-pthread'. So if you insert
it into myprogram_CFLAGS then your package will only work if the
compiler supports the '-pthread' option.
Note that CFLAGS is only applied when compiling. The LDFLAGS value is
used while linking so if you want to use '-pthread' then you should
supply it for both CFLAGS and LDFLAGS.
The Autoconf macro archive includes a macro for determining the
correct options to use in a platform-independent way.
Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/