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074c3a1b | 1 | # =========================================================================== |
8ca861a5 | 2 | # https://www.gnu.org/software/autoconf-archive/ax_pthread.html |
074c3a1b MJ |
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, | |
7be759d1 | 22 | # but also to link with them as well. For example, you might link with |
074c3a1b MJ |
23 | # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
24 | # | |
7be759d1 | 25 | # If you are only building threaded programs, you may wish to use these |
074c3a1b MJ |
26 | # variables in your default LIBS, CFLAGS, and CC: |
27 | # | |
28 | # LIBS="$PTHREAD_LIBS $LIBS" | |
29 | # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
30 | # CC="$PTHREAD_CC" | |
31 | # | |
32 | # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant | |
7be759d1 MJ |
33 | # has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to |
34 | # that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX). | |
074c3a1b MJ |
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> | |
b72f6acb | 58 | # Copyright (c) 2019 Marc Stevens <marc.stevens@cwi.nl> |
074c3a1b MJ |
59 | # |
60 | # This program is free software: you can redistribute it and/or modify it | |
61 | # under the terms of the GNU General Public License as published by the | |
62 | # Free Software Foundation, either version 3 of the License, or (at your | |
63 | # option) any later version. | |
64 | # | |
65 | # This program is distributed in the hope that it will be useful, but | |
66 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
67 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
68 | # Public License for more details. | |
69 | # | |
70 | # You should have received a copy of the GNU General Public License along | |
8ca861a5 | 71 | # with this program. If not, see <https://www.gnu.org/licenses/>. |
074c3a1b MJ |
72 | # |
73 | # As a special exception, the respective Autoconf Macro's copyright owner | |
74 | # gives unlimited permission to copy, distribute and modify the configure | |
75 | # scripts that are the output of Autoconf when processing the Macro. You | |
76 | # need not follow the terms of the GNU General Public License when using | |
77 | # or distributing such scripts, even though portions of the text of the | |
78 | # Macro appear in them. The GNU General Public License (GPL) does govern | |
79 | # all other use of the material that constitutes the Autoconf Macro. | |
80 | # | |
81 | # This special exception to the GPL applies to versions of the Autoconf | |
82 | # Macro released by the Autoconf Archive. When you make and distribute a | |
83 | # modified version of the Autoconf Macro, you may extend this special | |
84 | # exception to the GPL to apply to your modified version as well. | |
85 | ||
b72f6acb | 86 | #serial 27 |
074c3a1b MJ |
87 | |
88 | AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) | |
89 | AC_DEFUN([AX_PTHREAD], [ | |
90 | AC_REQUIRE([AC_CANONICAL_HOST]) | |
7be759d1 MJ |
91 | AC_REQUIRE([AC_PROG_CC]) |
92 | AC_REQUIRE([AC_PROG_SED]) | |
074c3a1b MJ |
93 | AC_LANG_PUSH([C]) |
94 | ax_pthread_ok=no | |
95 | ||
96 | # We used to check for pthread.h first, but this fails if pthread.h | |
7be759d1 | 97 | # requires special compiler flags (e.g. on Tru64 or Sequent). |
074c3a1b MJ |
98 | # It gets checked for in the link test anyway. |
99 | ||
100 | # First of all, check if the user has set any of the PTHREAD_LIBS, | |
101 | # etcetera environment variables, and if threads linking works using | |
102 | # them: | |
7be759d1 MJ |
103 | if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then |
104 | ax_pthread_save_CC="$CC" | |
105 | ax_pthread_save_CFLAGS="$CFLAGS" | |
106 | ax_pthread_save_LIBS="$LIBS" | |
107 | AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"]) | |
074c3a1b | 108 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
074c3a1b | 109 | LIBS="$PTHREAD_LIBS $LIBS" |
7be759d1 MJ |
110 | AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS]) |
111 | AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes]) | |
074c3a1b | 112 | AC_MSG_RESULT([$ax_pthread_ok]) |
7be759d1 | 113 | if test "x$ax_pthread_ok" = "xno"; then |
074c3a1b MJ |
114 | PTHREAD_LIBS="" |
115 | PTHREAD_CFLAGS="" | |
116 | fi | |
7be759d1 MJ |
117 | CC="$ax_pthread_save_CC" |
118 | CFLAGS="$ax_pthread_save_CFLAGS" | |
119 | LIBS="$ax_pthread_save_LIBS" | |
074c3a1b MJ |
120 | fi |
121 | ||
122 | # We must check for the threads library under a number of different | |
123 | # names; the ordering is very important because some systems | |
124 | # (e.g. DEC) have both -lpthread and -lpthreads, where one of the | |
125 | # libraries is broken (non-POSIX). | |
126 | ||
b72f6acb JG |
127 | # Create a list of thread flags to try. Items with a "," contain both |
128 | # C compiler flags (before ",") and linker flags (after ","). Other items | |
129 | # starting with a "-" are C compiler flags, and remaining items are | |
130 | # library names, except for "none" which indicates that we try without | |
131 | # any flags at all, and "pthread-config" which is a program returning | |
132 | # the flags for the Pth emulation library. | |
074c3a1b | 133 | |
7be759d1 | 134 | ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
074c3a1b MJ |
135 | |
136 | # The ordering *is* (sometimes) important. Some notes on the | |
137 | # individual items follow: | |
138 | ||
139 | # pthreads: AIX (must check this before -lpthread) | |
140 | # none: in case threads are in libc; should be tried before -Kthread and | |
141 | # other compiler flags to prevent continual compiler warnings | |
142 | # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) | |
7be759d1 MJ |
143 | # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64 |
144 | # (Note: HP C rejects this with "bad form for `-t' option") | |
145 | # -pthreads: Solaris/gcc (Note: HP C also rejects) | |
074c3a1b | 146 | # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
7be759d1 MJ |
147 | # doesn't hurt to check since this sometimes defines pthreads and |
148 | # -D_REENTRANT too), HP C (must be checked before -lpthread, which | |
149 | # is present but should not be used directly; and before -mthreads, | |
150 | # because the compiler interprets this as "-mt" + "-hreads") | |
151 | # -mthreads: Mingw32/gcc, Lynx/gcc | |
074c3a1b MJ |
152 | # pthread: Linux, etcetera |
153 | # --thread-safe: KAI C++ | |
154 | # pthread-config: use pthread-config program (for GNU Pth library) | |
155 | ||
7be759d1 MJ |
156 | case $host_os in |
157 | ||
158 | freebsd*) | |
159 | ||
160 | # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) | |
161 | # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) | |
162 | ||
163 | ax_pthread_flags="-kthread lthread $ax_pthread_flags" | |
164 | ;; | |
165 | ||
166 | hpux*) | |
167 | ||
168 | # From the cc(1) man page: "[-mt] Sets various -D flags to enable | |
169 | # multi-threading and also sets -lpthread." | |
170 | ||
171 | ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags" | |
172 | ;; | |
173 | ||
174 | openedition*) | |
175 | ||
176 | # IBM z/OS requires a feature-test macro to be defined in order to | |
177 | # enable POSIX threads at all, so give the user a hint if this is | |
178 | # not set. (We don't define these ourselves, as they can affect | |
179 | # other portions of the system API in unpredictable ways.) | |
180 | ||
181 | AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING], | |
182 | [ | |
183 | # if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS) | |
184 | AX_PTHREAD_ZOS_MISSING | |
185 | # endif | |
186 | ], | |
187 | [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])]) | |
188 | ;; | |
189 | ||
074c3a1b MJ |
190 | solaris*) |
191 | ||
192 | # On Solaris (at least, for some versions), libc contains stubbed | |
193 | # (non-functional) versions of the pthreads routines, so link-based | |
7be759d1 MJ |
194 | # tests will erroneously succeed. (N.B.: The stubs are missing |
195 | # pthread_cleanup_push, or rather a function called by this macro, | |
196 | # so we could check for that, but who knows whether they'll stub | |
197 | # that too in a future libc.) So we'll check first for the | |
198 | # standard Solaris way of linking pthreads (-mt -lpthread). | |
199 | ||
b72f6acb | 200 | ax_pthread_flags="-mt,-lpthread pthread $ax_pthread_flags" |
7be759d1 MJ |
201 | ;; |
202 | esac | |
203 | ||
b72f6acb JG |
204 | # Are we compiling with Clang? |
205 | ||
206 | AC_CACHE_CHECK([whether $CC is Clang], | |
207 | [ax_cv_PTHREAD_CLANG], | |
208 | [ax_cv_PTHREAD_CLANG=no | |
209 | # Note that Autoconf sets GCC=yes for Clang as well as GCC | |
210 | if test "x$GCC" = "xyes"; then | |
211 | AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG], | |
212 | [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */ | |
213 | # if defined(__clang__) && defined(__llvm__) | |
214 | AX_PTHREAD_CC_IS_CLANG | |
215 | # endif | |
216 | ], | |
217 | [ax_cv_PTHREAD_CLANG=yes]) | |
218 | fi | |
219 | ]) | |
220 | ax_pthread_clang="$ax_cv_PTHREAD_CLANG" | |
221 | ||
222 | ||
7be759d1 | 223 | # GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC) |
074c3a1b | 224 | |
b72f6acb JG |
225 | # Note that for GCC and Clang -pthread generally implies -lpthread, |
226 | # except when -nostdlib is passed. | |
227 | # This is problematic using libtool to build C++ shared libraries with pthread: | |
228 | # [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25460 | |
229 | # [2] https://bugzilla.redhat.com/show_bug.cgi?id=661333 | |
230 | # [3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468555 | |
231 | # To solve this, first try -pthread together with -lpthread for GCC | |
232 | ||
7be759d1 | 233 | AS_IF([test "x$GCC" = "xyes"], |
b72f6acb JG |
234 | [ax_pthread_flags="-pthread,-lpthread -pthread -pthreads $ax_pthread_flags"]) |
235 | ||
236 | # Clang takes -pthread (never supported any other flag), but we'll try with -lpthread first | |
237 | ||
238 | AS_IF([test "x$ax_pthread_clang" = "xyes"], | |
239 | [ax_pthread_flags="-pthread,-lpthread -pthread"]) | |
240 | ||
7be759d1 MJ |
241 | |
242 | # The presence of a feature test macro requesting re-entrant function | |
243 | # definitions is, on some systems, a strong hint that pthreads support is | |
244 | # correctly enabled | |
245 | ||
246 | case $host_os in | |
247 | darwin* | hpux* | linux* | osf* | solaris*) | |
248 | ax_pthread_check_macro="_REENTRANT" | |
074c3a1b MJ |
249 | ;; |
250 | ||
7be759d1 MJ |
251 | aix*) |
252 | ax_pthread_check_macro="_THREAD_SAFE" | |
253 | ;; | |
254 | ||
255 | *) | |
256 | ax_pthread_check_macro="--" | |
074c3a1b MJ |
257 | ;; |
258 | esac | |
7be759d1 MJ |
259 | AS_IF([test "x$ax_pthread_check_macro" = "x--"], |
260 | [ax_pthread_check_cond=0], | |
261 | [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"]) | |
262 | ||
7be759d1 | 263 | |
b72f6acb JG |
264 | if test "x$ax_pthread_ok" = "xno"; then |
265 | for ax_pthread_try_flag in $ax_pthread_flags; do | |
266 | ||
267 | case $ax_pthread_try_flag in | |
268 | none) | |
269 | AC_MSG_CHECKING([whether pthreads work without any flags]) | |
270 | ;; | |
271 | ||
272 | *,*) | |
273 | PTHREAD_CFLAGS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\1/"` | |
274 | PTHREAD_LIBS=`echo $ax_pthread_try_flag | sed "s/^\(.*\),\(.*\)$/\2/"` | |
275 | AC_MSG_CHECKING([whether pthreads work with "$PTHREAD_CFLAGS" and "$PTHREAD_LIBS"]) | |
276 | ;; | |
277 | ||
278 | -*) | |
279 | AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag]) | |
280 | PTHREAD_CFLAGS="$ax_pthread_try_flag" | |
281 | ;; | |
282 | ||
283 | pthread-config) | |
284 | AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) | |
285 | AS_IF([test "x$ax_pthread_config" = "xno"], [continue]) | |
286 | PTHREAD_CFLAGS="`pthread-config --cflags`" | |
287 | PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" | |
288 | ;; | |
289 | ||
290 | *) | |
291 | AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag]) | |
292 | PTHREAD_LIBS="-l$ax_pthread_try_flag" | |
293 | ;; | |
294 | esac | |
295 | ||
296 | ax_pthread_save_CFLAGS="$CFLAGS" | |
297 | ax_pthread_save_LIBS="$LIBS" | |
298 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
299 | LIBS="$PTHREAD_LIBS $LIBS" | |
300 | ||
301 | # Check for various functions. We must include pthread.h, | |
302 | # since some functions may be macros. (On the Sequent, we | |
303 | # need a special flag -Kthread to make this header compile.) | |
304 | # We check for pthread_join because it is in -lpthread on IRIX | |
305 | # while pthread_create is in libc. We check for pthread_attr_init | |
306 | # due to DEC craziness with -lpthreads. We check for | |
307 | # pthread_cleanup_push because it is one of the few pthread | |
308 | # functions on Solaris that doesn't have a non-functional libc stub. | |
309 | # We try pthread_create on general principles. | |
310 | ||
311 | AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> | |
312 | # if $ax_pthread_check_cond | |
313 | # error "$ax_pthread_check_macro must be defined" | |
314 | # endif | |
315 | static void *some_global = NULL; | |
316 | static void routine(void *a) | |
317 | { | |
318 | /* To avoid any unused-parameter or | |
319 | unused-but-set-parameter warning. */ | |
320 | some_global = a; | |
321 | } | |
322 | static void *start_routine(void *a) { return a; }], | |
323 | [pthread_t th; pthread_attr_t attr; | |
324 | pthread_create(&th, 0, start_routine, 0); | |
325 | pthread_join(th, 0); | |
326 | pthread_attr_init(&attr); | |
327 | pthread_cleanup_push(routine, 0); | |
328 | pthread_cleanup_pop(0) /* ; */])], | |
329 | [ax_pthread_ok=yes], | |
330 | []) | |
331 | ||
332 | CFLAGS="$ax_pthread_save_CFLAGS" | |
333 | LIBS="$ax_pthread_save_LIBS" | |
334 | ||
335 | AC_MSG_RESULT([$ax_pthread_ok]) | |
336 | AS_IF([test "x$ax_pthread_ok" = "xyes"], [break]) | |
337 | ||
338 | PTHREAD_LIBS="" | |
339 | PTHREAD_CFLAGS="" | |
340 | done | |
341 | fi | |
7be759d1 | 342 | |
7be759d1 MJ |
343 | |
344 | # Clang needs special handling, because older versions handle the -pthread | |
345 | # option in a rather... idiosyncratic way | |
346 | ||
347 | if test "x$ax_pthread_clang" = "xyes"; then | |
348 | ||
349 | # Clang takes -pthread; it has never supported any other flag | |
350 | ||
351 | # (Note 1: This will need to be revisited if a system that Clang | |
352 | # supports has POSIX threads in a separate library. This tends not | |
353 | # to be the way of modern systems, but it's conceivable.) | |
354 | ||
355 | # (Note 2: On some systems, notably Darwin, -pthread is not needed | |
356 | # to get POSIX threads support; the API is always present and | |
357 | # active. We could reasonably leave PTHREAD_CFLAGS empty. But | |
358 | # -pthread does define _REENTRANT, and while the Darwin headers | |
359 | # ignore this macro, third-party headers might not.) | |
360 | ||
7be759d1 MJ |
361 | # However, older versions of Clang make a point of warning the user |
362 | # that, in an invocation where only linking and no compilation is | |
363 | # taking place, the -pthread option has no effect ("argument unused | |
364 | # during compilation"). They expect -pthread to be passed in only | |
365 | # when source code is being compiled. | |
366 | # | |
367 | # Problem is, this is at odds with the way Automake and most other | |
368 | # C build frameworks function, which is that the same flags used in | |
369 | # compilation (CFLAGS) are also used in linking. Many systems | |
370 | # supported by AX_PTHREAD require exactly this for POSIX threads | |
371 | # support, and in fact it is often not straightforward to specify a | |
372 | # flag that is used only in the compilation phase and not in | |
373 | # linking. Such a scenario is extremely rare in practice. | |
374 | # | |
375 | # Even though use of the -pthread flag in linking would only print | |
376 | # a warning, this can be a nuisance for well-run software projects | |
377 | # that build with -Werror. So if the active version of Clang has | |
378 | # this misfeature, we search for an option to squash it. | |
379 | ||
380 | AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread], | |
381 | [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG], | |
382 | [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown | |
383 | # Create an alternate version of $ac_link that compiles and | |
384 | # links in two steps (.c -> .o, .o -> exe) instead of one | |
385 | # (.c -> exe), because the warning occurs only in the second | |
386 | # step | |
387 | ax_pthread_save_ac_link="$ac_link" | |
388 | ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g' | |
b72f6acb | 389 | ax_pthread_link_step=`AS_ECHO(["$ac_link"]) | sed "$ax_pthread_sed"` |
7be759d1 MJ |
390 | ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)" |
391 | ax_pthread_save_CFLAGS="$CFLAGS" | |
392 | for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do | |
393 | AS_IF([test "x$ax_pthread_try" = "xunknown"], [break]) | |
394 | CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS" | |
395 | ac_link="$ax_pthread_save_ac_link" | |
396 | AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], | |
397 | [ac_link="$ax_pthread_2step_ac_link" | |
398 | AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], | |
399 | [break]) | |
400 | ]) | |
401 | done | |
402 | ac_link="$ax_pthread_save_ac_link" | |
403 | CFLAGS="$ax_pthread_save_CFLAGS" | |
404 | AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no]) | |
405 | ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try" | |
406 | ]) | |
074c3a1b | 407 | |
7be759d1 MJ |
408 | case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in |
409 | no | unknown) ;; | |
410 | *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;; | |
411 | esac | |
074c3a1b | 412 | |
7be759d1 | 413 | fi # $ax_pthread_clang = yes |
074c3a1b | 414 | |
074c3a1b | 415 | |
074c3a1b MJ |
416 | |
417 | # Various other checks: | |
7be759d1 MJ |
418 | if test "x$ax_pthread_ok" = "xyes"; then |
419 | ax_pthread_save_CFLAGS="$CFLAGS" | |
420 | ax_pthread_save_LIBS="$LIBS" | |
074c3a1b | 421 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
7be759d1 | 422 | LIBS="$PTHREAD_LIBS $LIBS" |
074c3a1b MJ |
423 | |
424 | # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. | |
7be759d1 MJ |
425 | AC_CACHE_CHECK([for joinable pthread attribute], |
426 | [ax_cv_PTHREAD_JOINABLE_ATTR], | |
427 | [ax_cv_PTHREAD_JOINABLE_ATTR=unknown | |
428 | for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do | |
429 | AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], | |
430 | [int attr = $ax_pthread_attr; return attr /* ; */])], | |
431 | [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break], | |
432 | []) | |
433 | done | |
434 | ]) | |
435 | AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \ | |
436 | test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \ | |
437 | test "x$ax_pthread_joinable_attr_defined" != "xyes"], | |
438 | [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], | |
439 | [$ax_cv_PTHREAD_JOINABLE_ATTR], | |
440 | [Define to necessary symbol if this constant | |
441 | uses a non-standard name on your system.]) | |
442 | ax_pthread_joinable_attr_defined=yes | |
443 | ]) | |
444 | ||
445 | AC_CACHE_CHECK([whether more special flags are required for pthreads], | |
446 | [ax_cv_PTHREAD_SPECIAL_FLAGS], | |
447 | [ax_cv_PTHREAD_SPECIAL_FLAGS=no | |
448 | case $host_os in | |
449 | solaris*) | |
450 | ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS" | |
451 | ;; | |
452 | esac | |
453 | ]) | |
454 | AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \ | |
455 | test "x$ax_pthread_special_flags_added" != "xyes"], | |
456 | [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS" | |
457 | ax_pthread_special_flags_added=yes]) | |
074c3a1b MJ |
458 | |
459 | AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], | |
7be759d1 MJ |
460 | [ax_cv_PTHREAD_PRIO_INHERIT], |
461 | [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], | |
8ca861a5 MJ |
462 | [[int i = PTHREAD_PRIO_INHERIT; |
463 | return i;]])], | |
7be759d1 MJ |
464 | [ax_cv_PTHREAD_PRIO_INHERIT=yes], |
465 | [ax_cv_PTHREAD_PRIO_INHERIT=no]) | |
074c3a1b | 466 | ]) |
7be759d1 MJ |
467 | AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \ |
468 | test "x$ax_pthread_prio_inherit_defined" != "xyes"], | |
469 | [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.]) | |
470 | ax_pthread_prio_inherit_defined=yes | |
471 | ]) | |
074c3a1b | 472 | |
7be759d1 MJ |
473 | CFLAGS="$ax_pthread_save_CFLAGS" |
474 | LIBS="$ax_pthread_save_LIBS" | |
074c3a1b MJ |
475 | |
476 | # More AIX lossage: compile with *_r variant | |
7be759d1 | 477 | if test "x$GCC" != "xyes"; then |
074c3a1b MJ |
478 | case $host_os in |
479 | aix*) | |
480 | AS_CASE(["x/$CC"], | |
7be759d1 MJ |
481 | [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], |
482 | [#handle absolute path differently from PATH based program lookup | |
483 | AS_CASE(["x$CC"], | |
484 | [x/*], | |
485 | [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], | |
486 | [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) | |
074c3a1b MJ |
487 | ;; |
488 | esac | |
489 | fi | |
490 | fi | |
491 | ||
492 | test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" | |
493 | ||
494 | AC_SUBST([PTHREAD_LIBS]) | |
495 | AC_SUBST([PTHREAD_CFLAGS]) | |
496 | AC_SUBST([PTHREAD_CC]) | |
497 | ||
498 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
7be759d1 | 499 | if test "x$ax_pthread_ok" = "xyes"; then |
074c3a1b MJ |
500 | ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1]) |
501 | : | |
502 | else | |
503 | ax_pthread_ok=no | |
504 | $2 | |
505 | fi | |
506 | AC_LANG_POP | |
507 | ])dnl AX_PTHREAD |