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comparison m4/m4_ax_pthread.m4 @ 1528:7770ef82c463
Configure correct C compiler options for Pthreads
author | Adam Chlipala <adam@chlipala.net> |
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date | Thu, 04 Aug 2011 17:06:50 -0400 |
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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 16 | |
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_cpu}-${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_cpu}-${host_os}" in | |
258 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; | |
259 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; | |
260 esac | |
261 AC_MSG_RESULT(${flag}) | |
262 if test "x$flag" != xno; then | |
263 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" | |
264 fi | |
265 | |
266 AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], | |
267 ax_cv_PTHREAD_PRIO_INHERIT, [ | |
268 AC_LINK_IFELSE([ | |
269 AC_LANG_PROGRAM([[#include <pthread.h>]], [[int i = PTHREAD_PRIO_INHERIT;]])], | |
270 [ax_cv_PTHREAD_PRIO_INHERIT=yes], | |
271 [ax_cv_PTHREAD_PRIO_INHERIT=no]) | |
272 ]) | |
273 AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], | |
274 AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.])) | |
275 | |
276 LIBS="$save_LIBS" | |
277 CFLAGS="$save_CFLAGS" | |
278 | |
279 # More AIX lossage: must compile with xlc_r or cc_r | |
280 if test x"$GCC" != xyes; then | |
281 AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) | |
282 else | |
283 PTHREAD_CC=$CC | |
284 fi | |
285 else | |
286 PTHREAD_CC="$CC" | |
287 fi | |
288 | |
289 AC_SUBST(PTHREAD_LIBS) | |
290 AC_SUBST(PTHREAD_CFLAGS) | |
291 AC_SUBST(PTHREAD_CC) | |
292 | |
293 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
294 if test x"$ax_pthread_ok" = xyes; then | |
295 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) | |
296 : | |
297 else | |
298 ax_pthread_ok=no | |
299 $2 | |
300 fi | |
301 AC_LANG_POP | |
302 ])dnl AX_PTHREAD |