1
# ===========================================================================
2
# http://autoconf-archive.cryp.to/acx_pthread.html
3
# ===========================================================================
7
# ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
11
# This macro figures out how to build C programs using POSIX threads. It
12
# sets the PTHREAD_LIBS output variable to the threads library and linker
13
# flags, and the PTHREAD_CFLAGS output variable to any special C compiler
14
# flags that are needed. (The user can also force certain compiler
15
# flags/libs to be tested by setting these environment variables.)
17
# Also sets PTHREAD_CC to any special C compiler that is needed for
18
# multi-threaded programs (defaults to the value of CC otherwise). (This
19
# is necessary on AIX to use the special cc_r compiler alias.)
21
# NOTE: You are assumed to not only compile your program with these flags,
22
# but also link it with them as well. e.g. you should link with
23
# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
25
# If you are only building threads programs, you may wish to use these
26
# variables in your default LIBS, CFLAGS, and CC:
28
# LIBS="$PTHREAD_LIBS $LIBS"
29
# CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
32
# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
33
# has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
34
# (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
36
# ACTION-IF-FOUND is a list of shell commands to run if a threads library
37
# is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
38
# is not found. If ACTION-IF-FOUND is not specified, the default action
39
# will define HAVE_PTHREAD.
41
# Please let the authors know if this macro fails on any platform, or if
42
# you have any other suggestions or comments. This macro was based on work
43
# by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
44
# from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
45
# Alejandro Forero Cuervo to the autoconf macro repository. We are also
46
# grateful for the helpful feedback of numerous users.
50
# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
52
# This program is free software: you can redistribute it and/or modify it
53
# under the terms of the GNU General Public License as published by the
54
# Free Software Foundation, either version 3 of the License, or (at your
55
# option) any later version.
57
# This program is distributed in the hope that it will be useful, but
58
# WITHOUT ANY WARRANTY; without even the implied warranty of
59
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
60
# Public License for more details.
62
# You should have received a copy of the GNU General Public License along
63
# with this program. If not, see <http://www.gnu.org/licenses/>.
65
# As a special exception, the respective Autoconf Macro's copyright owner
66
# gives unlimited permission to copy, distribute and modify the configure
67
# scripts that are the output of Autoconf when processing the Macro. You
68
# need not follow the terms of the GNU General Public License when using
69
# or distributing such scripts, even though portions of the text of the
70
# Macro appear in them. The GNU General Public License (GPL) does govern
71
# all other use of the material that constitutes the Autoconf Macro.
73
# This special exception to the GPL applies to versions of the Autoconf
74
# Macro released by the Autoconf Archive. When you make and distribute a
75
# modified version of the Autoconf Macro, you may extend this special
76
# exception to the GPL to apply to your modified version as well.
78
AC_DEFUN([ACX_PTHREAD], [
79
AC_REQUIRE([AC_CANONICAL_HOST])
84
# We used to check for pthread.h first, but this fails if pthread.h
85
# requires special compiler flags (e.g. on True64 or Sequent).
86
# It gets checked for in the link test anyway.
88
# First of all, check if the user has set any of the PTHREAD_LIBS,
89
# etcetera environment variables, and if threads linking works using
91
if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
93
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
95
LIBS="$PTHREAD_LIBS $LIBS"
96
AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
97
AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
98
AC_MSG_RESULT($acx_pthread_ok)
99
if test x"$acx_pthread_ok" = xno; then
104
CFLAGS="$save_CFLAGS"
107
# We must check for the threads library under a number of different
108
# names; the ordering is very important because some systems
109
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
110
# libraries is broken (non-POSIX).
112
# Create a list of thread flags to try. Items starting with a "-" are
113
# C compiler flags, and other items are library names, except for "none"
114
# which indicates that we try without any flags at all, and "pthread-config"
115
# which is a program returning the flags for the Pth emulation library.
117
acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
119
# The ordering *is* (sometimes) important. Some notes on the
120
# individual items follow:
122
# pthreads: AIX (must check this before -lpthread)
123
# none: in case threads are in libc; should be tried before -Kthread and
124
# other compiler flags to prevent continual compiler warnings
125
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
126
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
127
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
128
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
129
# -pthreads: Solaris/gcc
130
# -mthreads: Mingw32/gcc, Lynx/gcc
131
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
132
# doesn't hurt to check since this sometimes defines pthreads too;
133
# also defines -D_REENTRANT)
134
# ... -mt is also the pthreads flag for HP/aCC
135
# pthread: Linux, etcetera
136
# --thread-safe: KAI C++
137
# pthread-config: use pthread-config program (for GNU Pth library)
139
case "${host_cpu}-${host_os}" in
142
# On linux "none" works, but boost requires -pthread, so, try first "-pthread"
143
acx_pthread_flags="-pthread pthreads none -Kthread -kthread lthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
148
# On Solaris (at least, for some versions), libc contains stubbed
149
# (non-functional) versions of the pthreads routines, so link-based
150
# tests will erroneously succeed. (We need to link with -pthreads/-mt/
151
# -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
152
# a function called by this macro, so we could check for that, but
153
# who knows whether they'll stub that too in a future libc.) So,
154
# we'll just look for -pthreads and -lpthread first:
156
acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
160
if test x"$acx_pthread_ok" = xno; then
161
for flag in $acx_pthread_flags; do
165
AC_MSG_CHECKING([whether pthreads work without any flags])
169
AC_MSG_CHECKING([whether pthreads work with $flag])
170
PTHREAD_CFLAGS="$flag"
174
AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
175
if test x"$acx_pthread_config" = xno; then continue; fi
176
PTHREAD_CFLAGS="`pthread-config --cflags`"
177
PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
181
AC_MSG_CHECKING([for the pthreads library -l$flag])
182
PTHREAD_LIBS="-l$flag"
187
save_CFLAGS="$CFLAGS"
188
LIBS="$PTHREAD_LIBS $LIBS"
189
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
191
# Check for various functions. We must include pthread.h,
192
# since some functions may be macros. (On the Sequent, we
193
# need a special flag -Kthread to make this header compile.)
194
# We check for pthread_join because it is in -lpthread on IRIX
195
# while pthread_create is in libc. We check for pthread_attr_init
196
# due to DEC craziness with -lpthreads. We check for
197
# pthread_cleanup_push because it is one of the few pthread
198
# functions on Solaris that doesn't have a non-functional libc stub.
199
# We try pthread_create on general principles.
200
AC_TRY_LINK([#include <pthread.h>],
201
[pthread_t th; pthread_join(th, 0);
202
pthread_attr_init(0); pthread_cleanup_push(0, 0);
203
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
204
[acx_pthread_ok=yes])
207
CFLAGS="$save_CFLAGS"
209
AC_MSG_RESULT($acx_pthread_ok)
210
if test "x$acx_pthread_ok" = xyes; then
219
# Various other checks:
220
if test "x$acx_pthread_ok" = xyes; then
222
LIBS="$PTHREAD_LIBS $LIBS"
223
save_CFLAGS="$CFLAGS"
224
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
226
# Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
227
AC_MSG_CHECKING([for joinable pthread attribute])
229
for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
230
AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
231
[attr_name=$attr; break])
233
AC_MSG_RESULT($attr_name)
234
if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
235
AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
236
[Define to necessary symbol if this constant
237
uses a non-standard name on your system.])
240
AC_MSG_CHECKING([if more special flags are required for pthreads])
242
case "${host_cpu}-${host_os}" in
243
*-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
244
*solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
246
AC_MSG_RESULT(${flag})
247
if test "x$flag" != xno; then
248
PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
252
CFLAGS="$save_CFLAGS"
254
# More AIX lossage: must compile with xlc_r or cc_r
255
if test x"$GCC" != xyes; then
256
AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
264
AC_SUBST(PTHREAD_LIBS)
265
AC_SUBST(PTHREAD_CFLAGS)
268
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
269
if test x"$acx_pthread_ok" = xyes; then
270
ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
added
removed
m4/acx_pthread.m4
