/[pcre]/code/trunk/m4/ax_pthread.m4
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Contents of /code/trunk/m4/ax_pthread.m4

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Revision 1019 - (show annotations)
Mon Aug 27 13:15:02 2012 UTC (7 years, 1 month ago) by ph10
File size: 12534 byte(s)
Daniel Richard G's patch for checking POSIX threads when JIT is configure.
1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_pthread.html
3 # ===========================================================================
4 #
5 # SYNOPSIS
6 #
7 # AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
8 #
9 # DESCRIPTION
10 #
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.)
16 #
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.)
20 #
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 $LIBS
24 #
25 # If you are only building threads programs, you may wish to use these
26 # variables in your default LIBS, CFLAGS, and CC:
27 #
28 # LIBS="$PTHREAD_LIBS $LIBS"
29 # CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
30 # CC="$PTHREAD_CC"
31 #
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).
35 #
36 # Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
37 # PTHREAD_PRIO_INHERIT symbol is defined when compiling with
38 # PTHREAD_CFLAGS.
39 #
40 # ACTION-IF-FOUND is a list of shell commands to run if a threads library
41 # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
42 # is not found. If ACTION-IF-FOUND is not specified, the default action
43 # will define HAVE_PTHREAD.
44 #
45 # Please let the authors know if this macro fails on any platform, or if
46 # you have any other suggestions or comments. This macro was based on work
47 # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
48 # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
49 # Alejandro Forero Cuervo to the autoconf macro repository. We are also
50 # grateful for the helpful feedback of numerous users.
51 #
52 # Updated for Autoconf 2.68 by Daniel Richard G.
53 #
54 # LICENSE
55 #
56 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
57 # Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
58 #
59 # This program is free software: you can redistribute it and/or modify it
60 # under the terms of the GNU General Public License as published by the
61 # Free Software Foundation, either version 3 of the License, or (at your
62 # option) any later version.
63 #
64 # This program is distributed in the hope that it will be useful, but
65 # WITHOUT ANY WARRANTY; without even the implied warranty of
66 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
67 # Public License for more details.
68 #
69 # You should have received a copy of the GNU General Public License along
70 # with this program. If not, see <http://www.gnu.org/licenses/>.
71 #
72 # As a special exception, the respective Autoconf Macro's copyright owner
73 # gives unlimited permission to copy, distribute and modify the configure
74 # scripts that are the output of Autoconf when processing the Macro. You
75 # need not follow the terms of the GNU General Public License when using
76 # or distributing such scripts, even though portions of the text of the
77 # Macro appear in them. The GNU General Public License (GPL) does govern
78 # all other use of the material that constitutes the Autoconf Macro.
79 #
80 # This special exception to the GPL applies to versions of the Autoconf
81 # Macro released by the Autoconf Archive. When you make and distribute a
82 # modified version of the Autoconf Macro, you may extend this special
83 # exception to the GPL to apply to your modified version as well.
84
85 #serial 18
86
87 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
88 AC_DEFUN([AX_PTHREAD], [
89 AC_REQUIRE([AC_CANONICAL_HOST])
90 AC_LANG_PUSH([C])
91 ax_pthread_ok=no
92
93 # We used to check for pthread.h first, but this fails if pthread.h
94 # requires special compiler flags (e.g. on True64 or Sequent).
95 # It gets checked for in the link test anyway.
96
97 # First of all, check if the user has set any of the PTHREAD_LIBS,
98 # etcetera environment variables, and if threads linking works using
99 # them:
100 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
101 save_CFLAGS="$CFLAGS"
102 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
103 save_LIBS="$LIBS"
104 LIBS="$PTHREAD_LIBS $LIBS"
105 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
106 AC_TRY_LINK_FUNC(pthread_join, ax_pthread_ok=yes)
107 AC_MSG_RESULT($ax_pthread_ok)
108 if test x"$ax_pthread_ok" = xno; then
109 PTHREAD_LIBS=""
110 PTHREAD_CFLAGS=""
111 fi
112 LIBS="$save_LIBS"
113 CFLAGS="$save_CFLAGS"
114 fi
115
116 # We must check for the threads library under a number of different
117 # names; the ordering is very important because some systems
118 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
119 # libraries is broken (non-POSIX).
120
121 # Create a list of thread flags to try. Items starting with a "-" are
122 # C compiler flags, and other items are library names, except for "none"
123 # which indicates that we try without any flags at all, and "pthread-config"
124 # which is a program returning the flags for the Pth emulation library.
125
126 ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
127
128 # The ordering *is* (sometimes) important. Some notes on the
129 # individual items follow:
130
131 # pthreads: AIX (must check this before -lpthread)
132 # none: in case threads are in libc; should be tried before -Kthread and
133 # other compiler flags to prevent continual compiler warnings
134 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
135 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
136 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
137 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
138 # -pthreads: Solaris/gcc
139 # -mthreads: Mingw32/gcc, Lynx/gcc
140 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
141 # doesn't hurt to check since this sometimes defines pthreads too;
142 # also defines -D_REENTRANT)
143 # ... -mt is also the pthreads flag for HP/aCC
144 # pthread: Linux, etcetera
145 # --thread-safe: KAI C++
146 # pthread-config: use pthread-config program (for GNU Pth library)
147
148 case ${host_os} in
149 solaris*)
150
151 # On Solaris (at least, for some versions), libc contains stubbed
152 # (non-functional) versions of the pthreads routines, so link-based
153 # tests will erroneously succeed. (We need to link with -pthreads/-mt/
154 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
155 # a function called by this macro, so we could check for that, but
156 # who knows whether they'll stub that too in a future libc.) So,
157 # we'll just look for -pthreads and -lpthread first:
158
159 ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
160 ;;
161
162 darwin*)
163 ax_pthread_flags="-pthread $ax_pthread_flags"
164 ;;
165 esac
166
167 if test x"$ax_pthread_ok" = xno; then
168 for flag in $ax_pthread_flags; do
169
170 case $flag in
171 none)
172 AC_MSG_CHECKING([whether pthreads work without any flags])
173 ;;
174
175 -*)
176 AC_MSG_CHECKING([whether pthreads work with $flag])
177 PTHREAD_CFLAGS="$flag"
178 ;;
179
180 pthread-config)
181 AC_CHECK_PROG(ax_pthread_config, pthread-config, yes, no)
182 if test x"$ax_pthread_config" = xno; then continue; fi
183 PTHREAD_CFLAGS="`pthread-config --cflags`"
184 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
185 ;;
186
187 *)
188 AC_MSG_CHECKING([for the pthreads library -l$flag])
189 PTHREAD_LIBS="-l$flag"
190 ;;
191 esac
192
193 save_LIBS="$LIBS"
194 save_CFLAGS="$CFLAGS"
195 LIBS="$PTHREAD_LIBS $LIBS"
196 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
197
198 # Check for various functions. We must include pthread.h,
199 # since some functions may be macros. (On the Sequent, we
200 # need a special flag -Kthread to make this header compile.)
201 # We check for pthread_join because it is in -lpthread on IRIX
202 # while pthread_create is in libc. We check for pthread_attr_init
203 # due to DEC craziness with -lpthreads. We check for
204 # pthread_cleanup_push because it is one of the few pthread
205 # functions on Solaris that doesn't have a non-functional libc stub.
206 # We try pthread_create on general principles.
207 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
208 static void routine(void *a) { a = 0; }
209 static void *start_routine(void *a) { return a; }],
210 [pthread_t th; pthread_attr_t attr;
211 pthread_create(&th, 0, start_routine, 0);
212 pthread_join(th, 0);
213 pthread_attr_init(&attr);
214 pthread_cleanup_push(routine, 0);
215 pthread_cleanup_pop(0) /* ; */])],
216 [ax_pthread_ok=yes],
217 [])
218
219 LIBS="$save_LIBS"
220 CFLAGS="$save_CFLAGS"
221
222 AC_MSG_RESULT($ax_pthread_ok)
223 if test "x$ax_pthread_ok" = xyes; then
224 break;
225 fi
226
227 PTHREAD_LIBS=""
228 PTHREAD_CFLAGS=""
229 done
230 fi
231
232 # Various other checks:
233 if test "x$ax_pthread_ok" = xyes; then
234 save_LIBS="$LIBS"
235 LIBS="$PTHREAD_LIBS $LIBS"
236 save_CFLAGS="$CFLAGS"
237 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
238
239 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
240 AC_MSG_CHECKING([for joinable pthread attribute])
241 attr_name=unknown
242 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
243 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
244 [int attr = $attr; return attr /* ; */])],
245 [attr_name=$attr; break],
246 [])
247 done
248 AC_MSG_RESULT($attr_name)
249 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
250 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
251 [Define to necessary symbol if this constant
252 uses a non-standard name on your system.])
253 fi
254
255 AC_MSG_CHECKING([if more special flags are required for pthreads])
256 flag=no
257 case ${host_os} in
258 aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
259 osf* | hpux*) flag="-D_REENTRANT";;
260 solaris*)
261 if test "$GCC" = "yes"; then
262 flag="-D_REENTRANT"
263 else
264 flag="-mt -D_REENTRANT"
265 fi
266 ;;
267 esac
268 AC_MSG_RESULT(${flag})
269 if test "x$flag" != xno; then
270 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
271 fi
272
273 AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
274 ax_cv_PTHREAD_PRIO_INHERIT, [
275 AC_LINK_IFELSE([
276 AC_LANG_PROGRAM([[#include <pthread.h>]], [[int i = PTHREAD_PRIO_INHERIT;]])],
277 [ax_cv_PTHREAD_PRIO_INHERIT=yes],
278 [ax_cv_PTHREAD_PRIO_INHERIT=no])
279 ])
280 AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
281 AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.]))
282
283 LIBS="$save_LIBS"
284 CFLAGS="$save_CFLAGS"
285
286 # More AIX lossage: must compile with xlc_r or cc_r
287 if test x"$GCC" != xyes; then
288 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
289 else
290 PTHREAD_CC=$CC
291 fi
292 else
293 PTHREAD_CC="$CC"
294 fi
295
296 AC_SUBST(PTHREAD_LIBS)
297 AC_SUBST(PTHREAD_CFLAGS)
298 AC_SUBST(PTHREAD_CC)
299
300 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
301 if test x"$ax_pthread_ok" = xyes; then
302 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
303 :
304 else
305 ax_pthread_ok=no
306 $2
307 fi
308 AC_LANG_POP
309 ])dnl AX_PTHREAD

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