Diff of /trunk/config/acx_pthread.m4

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	revision 123, Mon Jun 28 18:05:04 2010 UTC	revision 1113, Thu May 5 04:11:52 2011 UTC
#	Line 1	Line 1
1		dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
2	dnl	dnl
3	dnl  ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])	dnl @summary figure out how to build C programs using POSIX threads
4	dnl	dnl
5	dnl Description	dnl This macro figures out how to build C programs using POSIX threads.
6	dnl	dnl It sets the PTHREAD_LIBS output variable to the threads library and
7	dnl This macro figures out how to build C programs using POSIX threads. It	dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
8	dnl sets the PTHREAD_LIBS output variable to the threads library and linker	dnl C compiler flags that are needed. (The user can also force certain
9	dnl flags, and the PTHREAD_CFLAGS output variable to any special C compiler	dnl compiler flags/libs to be tested by setting these environment
10	dnl flags that are needed. (The user can also force certain compiler	dnl variables.)
	dnl flags/libs to be tested by setting these environment variables.)
11	dnl	dnl
12	dnl Also sets PTHREAD_CC to any special C compiler that is needed for	dnl Also sets PTHREAD_CC to any special C compiler that is needed for
13	dnl multi-threaded programs (defaults to the value of CC otherwise). (This is	dnl multi-threaded programs (defaults to the value of CC otherwise).
14	dnl necessary on AIX to use the special cc_r compiler alias.)	dnl (This is necessary on AIX to use the special cc_r compiler alias.)
15	dnl	dnl
16	dnl NOTE: You are assumed to not only compile your program with these flags,	dnl NOTE: You are assumed to not only compile your program with these
17	dnl but also link it with them as well. e.g. you should link with $PTHREAD_CC	dnl flags, but also link it with them as well. e.g. you should link
18	dnl $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS	dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
19		dnl $LIBS
20	dnl	dnl
21	dnl If you are only building threads programs, you may wish to use these	dnl If you are only building threads programs, you may wish to use
22	dnl variables in your default LIBS, CFLAGS, and CC:	dnl these variables in your default LIBS, CFLAGS, and CC:
23	dnl	dnl
24	dnl        LIBS="$PTHREAD_LIBS $LIBS"	dnl        LIBS="$PTHREAD_LIBS $LIBS"
25	dnl        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"	dnl        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
26	dnl        CC="$PTHREAD_CC"	dnl        CC="$PTHREAD_CC"
27	dnl	dnl
28	dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant	dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
29	dnl has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name	dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
30	dnl (e.g. PTHREAD_CREATE_UNDETACHED on AIX).	dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
31	dnl	dnl
32	dnl ACTION-IF-FOUND is a list of shell commands to run if a threads library	dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
33	dnl is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it	dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
34	dnl is not found. If ACTION-IF-FOUND is not specified, the default action	dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
35	dnl will define HAVE_PTHREAD.	dnl default action will define HAVE_PTHREAD.
36	dnl	dnl
37	dnl Please let the authors know if this macro fails on any platform, or if	dnl Please let the authors know if this macro fails on any platform, or
38	dnl you have any other suggestions or comments. This macro was based on work	dnl if you have any other suggestions or comments. This macro was based
39	dnl by SGJ on autoconf scripts for FFTW (www.fftw.org) (with help from M.	dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
40	dnl Frigo), as well as ac_pthread and hb_pthread macros posted by AFC to the	dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
41	dnl autoconf macro repository. We are also grateful for the helpful feedback	dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
42	dnl of numerous users.	dnl We are also grateful for the helpful feedback of numerous users.
43	dnl	dnl
44	dnl Version: 1.8 (last modified: 2003-05-21)	dnl @category InstalledPackages
45	dnl Author: Steven G. Johnson <stevenj@alum.mit.edu> and	dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
46	dnl         Alejandro Forero Cuervo <bachue@bachue.com>	dnl @version 2006-05-29
47	dnl	dnl @license GPLWithACException
	dnl from http://www.gnu.org/software/ac-archive/htmldoc/index.html
	dnl
	dnl License:
	dnl GNU General Public License
	dnl [http://www.gnu.org/software/ac-archive/htmldoc/COPYING.html]
	dnl with this special exception
	dnl [http://www.gnu.org/software/ac-archive/htmldoc/COPYING-Exception.html].
	dnl
48
49	AC_DEFUN([ACX_PTHREAD], [	AC_DEFUN([ACX_PTHREAD], [
50	AC_REQUIRE([AC_CANONICAL_HOST])	AC_REQUIRE([AC_CANONICAL_HOST])
#	Line 89	Line 82
82
83	# Create a list of thread flags to try.  Items starting with a "-" are	# Create a list of thread flags to try.  Items starting with a "-" are
84	# C compiler flags, and other items are library names, except for "none"	# C compiler flags, and other items are library names, except for "none"
85	# which indicates that we try without any flags at all.	# which indicates that we try without any flags at all, and "pthread-config"
86		# which is a program returning the flags for the Pth emulation library.
87
88	acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt"	acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
89
90	# The ordering *is* (sometimes) important.  Some notes on the	# The ordering *is* (sometimes) important.  Some notes on the
91	# individual items follow:	# individual items follow:
#	Line 108	Line 102
102	# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it	# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
103	#      doesn't hurt to check since this sometimes defines pthreads too;	#      doesn't hurt to check since this sometimes defines pthreads too;
104	#      also defines -D_REENTRANT)	#      also defines -D_REENTRANT)
105		#      ... -mt is also the pthreads flag for HP/aCC
106	# pthread: Linux, etcetera	# pthread: Linux, etcetera
107	# --thread-safe: KAI C++	# --thread-safe: KAI C++
108		# pthread-config: use pthread-config program (for GNU Pth library)
109
110	case "${host_cpu}-${host_os}" in	case "${host_cpu}-${host_os}" in
111	*solaris*)	*solaris*)
112
113	# On Solaris (at least, for some versions), libc contains stubbed	# On Solaris (at least, for some versions), libc contains stubbed
114	# (non-functional) versions of the pthreads routines, so link-based	# (non-functional) versions of the pthreads routines, so link-based
115	# tests will erroneously succeed.  (We need to link with -pthread or	# tests will erroneously succeed.  (We need to link with -pthreads/-mt/
116	# -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather	# -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
117	# a function called by this macro, so we could check for that, but	# a function called by this macro, so we could check for that, but
118	# who knows whether they'll stub that too in a future libc.)  So,	# who knows whether they'll stub that too in a future libc.)  So,
119	# we'll just look for -pthreads and -lpthread first:	# we'll just look for -pthreads and -lpthread first:
120
121	acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"	acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
122	;;	;;
123	esac	esac
124
#	Line 139	Line 135
135	PTHREAD_CFLAGS="$flag"	PTHREAD_CFLAGS="$flag"
136	;;	;;
137
138		pthread-config)
139		AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
140		if test x"$acx_pthread_config" = xno; then continue; fi
141		PTHREAD_CFLAGS="`pthread-config --cflags`"
142		PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
143		;;
144
145	*)	*)
146	AC_MSG_CHECKING([for the pthreads library -l$flag])	AC_MSG_CHECKING([for the pthreads library -l$flag])
147	PTHREAD_LIBS="-l$flag"	PTHREAD_LIBS="-l$flag"
#	Line 185	Line 188
188	save_CFLAGS="$CFLAGS"	save_CFLAGS="$CFLAGS"
189	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
190
191	# Detect AIX lossage: threads are created detached by default	# Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
	# and the JOINABLE attribute has a nonstandard name (UNDETACHED).
192	AC_MSG_CHECKING([for joinable pthread attribute])	AC_MSG_CHECKING([for joinable pthread attribute])
193	AC_TRY_LINK([#include <pthread.h>],	attr_name=unknown
194	[int attr=PTHREAD_CREATE_JOINABLE;],	for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
195	ok=PTHREAD_CREATE_JOINABLE, ok=unknown)	AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
196	if test x"$ok" = xunknown; then	[attr_name=$attr; break])
197	AC_TRY_LINK([#include <pthread.h>],	done
198	[int attr=PTHREAD_CREATE_UNDETACHED;],	AC_MSG_RESULT($attr_name)
199	ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)	if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
200	fi	AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
201	if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then	[Define to necessary symbol if this constant
	AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
	[Define to the necessary symbol if this constant
202	uses a non-standard name on your system.])	uses a non-standard name on your system.])
203	fi	fi
	AC_MSG_RESULT(${ok})
	if test x"$ok" = xunknown; then
	AC_MSG_WARN([we do not know how to create joinable pthreads])
	fi
204
205	AC_MSG_CHECKING([if more special flags are required for pthreads])	AC_MSG_CHECKING([if more special flags are required for pthreads])
206	flag=no	flag=no
207	case "${host_cpu}-${host_os}" in	case "${host_cpu}-${host_os}" in
208	*-aix* | *-freebsd*)     flag="-D_THREAD_SAFE";;	*-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
209	*solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;	*solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
210	esac	esac
211	AC_MSG_RESULT(${flag})	AC_MSG_RESULT(${flag})
#	Line 220	Line 216
216	LIBS="$save_LIBS"	LIBS="$save_LIBS"
217	CFLAGS="$save_CFLAGS"	CFLAGS="$save_CFLAGS"
218
219	# More AIX lossage: must compile with cc_r	# More AIX lossage: must compile with xlc_r or cc_r
220	AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})	if test x"$GCC" != xyes; then
221		AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
222		else
223		PTHREAD_CC=$CC
224		fi
225	else	else
226	PTHREAD_CC="$CC"	PTHREAD_CC="$CC"
227	fi	fi

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