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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 21 | |
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 $ax_pthread_flags" | |
164 | ;; | |
165 | esac | |
166 | ||
167 | # Clang doesn't consider unrecognized options an error unless we specify | |
168 | # -Werror. We throw in some extra Clang-specific options to ensure that | |
169 | # this doesn't happen for GCC, which also accepts -Werror. | |
170 | ||
171 | AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags]) | |
172 | save_CFLAGS="$CFLAGS" | |
173 | ax_pthread_extra_flags="-Werror" | |
174 | CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument" | |
175 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])], | |
176 | [AC_MSG_RESULT([yes])], | |
177 | [ax_pthread_extra_flags= | |
178 | AC_MSG_RESULT([no])]) | |
179 | CFLAGS="$save_CFLAGS" | |
180 | ||
181 | if test x"$ax_pthread_ok" = xno; then | |
182 | for flag in $ax_pthread_flags; do | |
183 | ||
184 | case $flag in | |
185 | none) | |
186 | AC_MSG_CHECKING([whether pthreads work without any flags]) | |
187 | ;; | |
188 | ||
189 | -*) | |
190 | AC_MSG_CHECKING([whether pthreads work with $flag]) | |
191 | PTHREAD_CFLAGS="$flag" | |
192 | ;; | |
193 | ||
194 | pthread-config) | |
195 | AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) | |
196 | if test x"$ax_pthread_config" = xno; then continue; fi | |
197 | PTHREAD_CFLAGS="`pthread-config --cflags`" | |
198 | PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" | |
199 | ;; | |
200 | ||
201 | *) | |
202 | AC_MSG_CHECKING([for the pthreads library -l$flag]) | |
203 | PTHREAD_LIBS="-l$flag" | |
204 | ;; | |
205 | esac | |
206 | ||
207 | save_LIBS="$LIBS" | |
208 | save_CFLAGS="$CFLAGS" | |
209 | LIBS="$PTHREAD_LIBS $LIBS" | |
210 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags" | |
211 | ||
212 | # Check for various functions. We must include pthread.h, | |
213 | # since some functions may be macros. (On the Sequent, we | |
214 | # need a special flag -Kthread to make this header compile.) | |
215 | # We check for pthread_join because it is in -lpthread on IRIX | |
216 | # while pthread_create is in libc. We check for pthread_attr_init | |
217 | # due to DEC craziness with -lpthreads. We check for | |
218 | # pthread_cleanup_push because it is one of the few pthread | |
219 | # functions on Solaris that doesn't have a non-functional libc stub. | |
220 | # We try pthread_create on general principles. | |
221 | AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> | |
222 | static void routine(void *a) { a = 0; } | |
223 | static void *start_routine(void *a) { return a; }], | |
224 | [pthread_t th; pthread_attr_t attr; | |
225 | pthread_create(&th, 0, start_routine, 0); | |
226 | pthread_join(th, 0); | |
227 | pthread_attr_init(&attr); | |
228 | pthread_cleanup_push(routine, 0); | |
229 | pthread_cleanup_pop(0) /* ; */])], | |
230 | [ax_pthread_ok=yes], | |
231 | []) | |
232 | ||
233 | LIBS="$save_LIBS" | |
234 | CFLAGS="$save_CFLAGS" | |
235 | ||
236 | AC_MSG_RESULT([$ax_pthread_ok]) | |
237 | if test "x$ax_pthread_ok" = xyes; then | |
238 | break; | |
239 | fi | |
240 | ||
241 | PTHREAD_LIBS="" | |
242 | PTHREAD_CFLAGS="" | |
243 | done | |
244 | fi | |
245 | ||
246 | # Various other checks: | |
247 | if test "x$ax_pthread_ok" = xyes; then | |
248 | save_LIBS="$LIBS" | |
249 | LIBS="$PTHREAD_LIBS $LIBS" | |
250 | save_CFLAGS="$CFLAGS" | |
251 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
252 | ||
253 | # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. | |
254 | AC_MSG_CHECKING([for joinable pthread attribute]) | |
255 | attr_name=unknown | |
256 | for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do | |
257 | AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], | |
258 | [int attr = $attr; return attr /* ; */])], | |
259 | [attr_name=$attr; break], | |
260 | []) | |
261 | done | |
262 | AC_MSG_RESULT([$attr_name]) | |
263 | if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then | |
264 | AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name], | |
265 | [Define to necessary symbol if this constant | |
266 | uses a non-standard name on your system.]) | |
267 | fi | |
268 | ||
269 | AC_MSG_CHECKING([if more special flags are required for pthreads]) | |
270 | flag=no | |
271 | case ${host_os} in | |
272 | aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";; | |
273 | osf* | hpux*) flag="-D_REENTRANT";; | |
274 | solaris*) | |
275 | if test "$GCC" = "yes"; then | |
276 | flag="-D_REENTRANT" | |
277 | else | |
278 | # TODO: What about Clang on Solaris? | |
279 | flag="-mt -D_REENTRANT" | |
280 | fi | |
281 | ;; | |
282 | esac | |
283 | AC_MSG_RESULT([$flag]) | |
284 | if test "x$flag" != xno; then | |
285 | PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" | |
286 | fi | |
287 | ||
288 | AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], | |
289 | [ax_cv_PTHREAD_PRIO_INHERIT], [ | |
290 | AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], | |
291 | [[int i = PTHREAD_PRIO_INHERIT;]])], | |
292 | [ax_cv_PTHREAD_PRIO_INHERIT=yes], | |
293 | [ax_cv_PTHREAD_PRIO_INHERIT=no]) | |
294 | ]) | |
295 | AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], | |
296 | [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])]) | |
297 | ||
298 | LIBS="$save_LIBS" | |
299 | CFLAGS="$save_CFLAGS" | |
300 | ||
301 | # More AIX lossage: compile with *_r variant | |
302 | if test "x$GCC" != xyes; then | |
303 | case $host_os in | |
304 | aix*) | |
305 | AS_CASE(["x/$CC"], | |
306 | [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], | |
307 | [#handle absolute path differently from PATH based program lookup | |
308 | AS_CASE(["x$CC"], | |
309 | [x/*], | |
310 | [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], | |
311 | [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) | |
312 | ;; | |
313 | esac | |
314 | fi | |
315 | fi | |
316 | ||
317 | test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" | |
318 | ||
319 | AC_SUBST([PTHREAD_LIBS]) | |
320 | AC_SUBST([PTHREAD_CFLAGS]) | |
321 | AC_SUBST([PTHREAD_CC]) | |
322 | ||
323 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
324 | if test x"$ax_pthread_ok" = xyes; then | |
325 | ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1]) | |
326 | : | |
327 | else | |
328 | ax_pthread_ok=no | |
329 | $2 | |
330 | fi | |
331 | AC_LANG_POP | |
332 | ])dnl AX_PTHREAD |