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Autoconf Macro: acx_pthread
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<h1>
acx_pthread
</h1>
<h2>
SYNOPSIS
</h2>
<p class="indent" style="white-space:nowrap;">
<code>ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])</code>
</p>
<h2>
DESCRIPTION
</h2>
<div class="indent">
<p>
This macro figures out how to build C programs using POSIX threads. It sets
the PTHREAD_LIBS output variable to the threads library and linker flags,
and the PTHREAD_CFLAGS output variable to any special C compiler flags that
are needed. (The user can also force certain compiler flags/libs to be
tested by setting these environment variables.)
</p>
<p>
Also sets PTHREAD_CC to any special C compiler that is needed for
multi-threaded programs (defaults to the value of CC otherwise). (This is
necessary on AIX to use the special cc_r compiler alias.)
</p>
<p>
NOTE: You are assumed to not only compile your program with these flags,
but also link it with them as well. e.g. you should link with $PTHREAD_CC
$CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
</p>
<p>
If you are only building threads programs, you may wish to use these
variables in your default LIBS, CFLAGS, and CC:
</p>
<pre>
LIBS="$PTHREAD_LIBS $LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
CC="$PTHREAD_CC"
</pre>
<p>
In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant has a
nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name (e.g.
PTHREAD_CREATE_UNDETACHED on AIX).
</p>
<p>
ACTION-IF-FOUND is a list of shell commands to run if a threads library is
found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is not
found. If ACTION-IF-FOUND is not specified, the default action will define
HAVE_PTHREAD.
</p>
<p>
Please let the authors know if this macro fails on any platform, or if you
have any other suggestions or comments. This macro was based on work by SGJ
on autoconf scripts for FFTW (<a href=
"http://www.fftw.org/">http://www.fftw.org/</a>) (with help from M. Frigo),
as well as ac_pthread and hb_pthread macros posted by Alejandro Forero
Cuervo to the autoconf macro repository. We are also grateful for the
helpful feedback of numerous users.
</p>
</div>
<h2>
SOURCE CODE
</h2>
<p class="indent">
<a href=
"http://autoconf-archive.cryp.to/acx_pthread.m4">http://autoconf-archive.cryp.to/acx_pthread.m4</a>
</p>
<h2>
LICENSE
</h2>
<div class="indent">
<p style="white-space:nowrap;">
Copyright © 2008 Steven G. Johnson <stevenj@alum.mit.edu>
</p>
<p>
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
</p>
<p>
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
</p>
<p>
You should have received a copy of the GNU General Public License along
with this program. If not, see <<a href=
"http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>>.
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As a special exception, the respective Autoconf Macro's copyright owner
gives unlimited permission to copy, distribute and modify the configure
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use of the material that constitutes the Autoconf Macro.
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