Mercurial > octave-nkf
annotate m4/ax_pthread.m4 @ 20039:eba80000fa0d rc-4-0-0-2
maint: Bump version number for 4.0.0-rc2.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 20 Mar 2015 16:19:38 -0400 |
| parents | d6240c099a02 |
| children |
| rev | line source |
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| 9497 | 1 # =========================================================================== |
| 10951 | 2 # http://www.gnu.org/software/autoconf-archive/ax_pthread.html |
| 9497 | 3 # =========================================================================== |
| 4 # | |
| 5 # SYNOPSIS | |
| 6 # | |
| 10951 | 7 # AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
| 9497 | 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 $LIBS | |
| 24 # | |
| 25 # If you are only building threads programs, you may wish to use these | |
| 26 # variables in your default LIBS, CFLAGS, and CC: | |
| 27 # | |
| 10951 | 28 # LIBS="$PTHREAD_LIBS $LIBS" |
| 29 # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" | |
| 30 # CC="$PTHREAD_CC" | |
| 9497 | 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 # | |
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36 # Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the |
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37 # PTHREAD_PRIO_INHERIT symbol is defined when compiling with |
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38 # PTHREAD_CFLAGS. |
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39 # |
| 9497 | 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 # | |
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52 # Updated for Autoconf 2.68 by Daniel Richard G. |
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53 # |
| 9497 | 54 # LICENSE |
| 55 # | |
| 56 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> | |
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57 # Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG> |
| 9497 | 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 | |
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85 #serial 21 |
| 10951 | 86 |
| 87 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) | |
| 88 AC_DEFUN([AX_PTHREAD], [ | |
| 9497 | 89 AC_REQUIRE([AC_CANONICAL_HOST]) |
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90 AC_LANG_PUSH([C]) |
| 10951 | 91 ax_pthread_ok=no |
| 9497 | 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=$PTHREAD_CFLAGS]) | |
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106 AC_TRY_LINK_FUNC([pthread_join], [ax_pthread_ok=yes]) |
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107 AC_MSG_RESULT([$ax_pthread_ok]) |
| 10951 | 108 if test x"$ax_pthread_ok" = xno; then |
| 9497 | 109 PTHREAD_LIBS="" |
| 110 PTHREAD_CFLAGS="" | |
| 111 fi | |
| 112 LIBS="$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 | |
| 10951 | 126 ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
| 9497 | 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 | |
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148 case ${host_os} in |
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149 solaris*) |
| 9497 | 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 | |
| 10951 | 159 ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags" |
| 9497 | 160 ;; |
| 10951 | 161 |
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162 darwin*) |
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163 ax_pthread_flags="-pthread $ax_pthread_flags" |
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164 ;; |
| 9497 | 165 esac |
| 166 | |
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167 # Clang doesn't consider unrecognized options an error unless we specify |
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168 # -Werror. We throw in some extra Clang-specific options to ensure that |
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169 # this doesn't happen for GCC, which also accepts -Werror. |
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170 |
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171 AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags]) |
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172 save_CFLAGS="$CFLAGS" |
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173 ax_pthread_extra_flags="-Werror" |
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174 CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument" |
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175 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])], |
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176 [AC_MSG_RESULT([yes])], |
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177 [ax_pthread_extra_flags= |
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178 AC_MSG_RESULT([no])]) |
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179 CFLAGS="$save_CFLAGS" |
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180 |
| 10951 | 181 if test x"$ax_pthread_ok" = xno; then |
| 182 for flag in $ax_pthread_flags; do | |
| 9497 | 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 | |
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194 pthread-config) |
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195 AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) |
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196 if test x"$ax_pthread_config" = xno; then continue; fi |
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197 PTHREAD_CFLAGS="`pthread-config --cflags`" |
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198 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
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199 ;; |
| 9497 | 200 |
| 201 *) | |
| 202 AC_MSG_CHECKING([for the pthreads library -l$flag]) | |
| 203 PTHREAD_LIBS="-l$flag" | |
| 204 ;; | |
| 205 esac | |
| 206 | |
| 207 save_LIBS="$LIBS" | |
| 208 save_CFLAGS="$CFLAGS" | |
| 209 LIBS="$PTHREAD_LIBS $LIBS" | |
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210 CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags" |
| 9497 | 211 |
| 212 # Check for various functions. We must include pthread.h, | |
| 213 # since some functions may be macros. (On the Sequent, we | |
| 214 # need a special flag -Kthread to make this header compile.) | |
| 215 # We check for pthread_join because it is in -lpthread on IRIX | |
| 216 # while pthread_create is in libc. We check for pthread_attr_init | |
| 217 # due to DEC craziness with -lpthreads. We check for | |
| 218 # pthread_cleanup_push because it is one of the few pthread | |
| 219 # functions on Solaris that doesn't have a non-functional libc stub. | |
| 220 # We try pthread_create on general principles. | |
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221 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> |
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222 static void routine(void *a) { a = 0; } |
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223 static void *start_routine(void *a) { return a; }], |
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224 [pthread_t th; pthread_attr_t attr; |
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225 pthread_create(&th, 0, start_routine, 0); |
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226 pthread_join(th, 0); |
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227 pthread_attr_init(&attr); |
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228 pthread_cleanup_push(routine, 0); |
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229 pthread_cleanup_pop(0) /* ; */])], |
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230 [ax_pthread_ok=yes], |
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231 []) |
| 9497 | 232 |
| 233 LIBS="$save_LIBS" | |
| 234 CFLAGS="$save_CFLAGS" | |
| 235 | |
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236 AC_MSG_RESULT([$ax_pthread_ok]) |
| 10951 | 237 if test "x$ax_pthread_ok" = xyes; then |
| 9497 | 238 break; |
| 239 fi | |
| 240 | |
| 241 PTHREAD_LIBS="" | |
| 242 PTHREAD_CFLAGS="" | |
| 243 done | |
| 244 fi | |
| 245 | |
| 246 # Various other checks: | |
| 10951 | 247 if test "x$ax_pthread_ok" = xyes; then |
| 9497 | 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. | |
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254 AC_MSG_CHECKING([for joinable pthread attribute]) |
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255 attr_name=unknown |
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256 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
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257 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], |
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258 [int attr = $attr; return attr /* ; */])], |
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259 [attr_name=$attr; break], |
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260 []) |
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261 done |
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262 AC_MSG_RESULT([$attr_name]) |
| 9497 | 263 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then |
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264 AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name], |
| 9497 | 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 | |
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271 case ${host_os} in |
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272 aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";; |
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273 osf* | hpux*) flag="-D_REENTRANT";; |
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274 solaris*) |
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275 if test "$GCC" = "yes"; then |
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276 flag="-D_REENTRANT" |
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277 else |
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278 # TODO: What about Clang on Solaris? |
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279 flag="-mt -D_REENTRANT" |
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280 fi |
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281 ;; |
| 9497 | 282 esac |
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283 AC_MSG_RESULT([$flag]) |
| 9497 | 284 if test "x$flag" != xno; then |
| 285 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" | |
| 286 fi | |
| 287 | |
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288 AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], |
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289 [ax_cv_PTHREAD_PRIO_INHERIT], [ |
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290 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], |
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291 [[int i = PTHREAD_PRIO_INHERIT;]])], |
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292 [ax_cv_PTHREAD_PRIO_INHERIT=yes], |
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293 [ax_cv_PTHREAD_PRIO_INHERIT=no]) |
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294 ]) |
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295 AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], |
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296 [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])]) |
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297 |
| 9497 | 298 LIBS="$save_LIBS" |
| 299 CFLAGS="$save_CFLAGS" | |
| 300 | |
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301 # More AIX lossage: compile with *_r variant |
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302 if test "x$GCC" != xyes; then |
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303 case $host_os in |
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304 aix*) |
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305 AS_CASE(["x/$CC"], |
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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], |
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307 [#handle absolute path differently from PATH based program lookup |
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308 AS_CASE(["x$CC"], |
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309 [x/*], |
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310 [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], |
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311 [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) |
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312 ;; |
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313 esac |
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314 fi |
| 9497 | 315 fi |
| 316 | |
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317 test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" |
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318 |
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319 AC_SUBST([PTHREAD_LIBS]) |
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320 AC_SUBST([PTHREAD_CFLAGS]) |
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321 AC_SUBST([PTHREAD_CC]) |
| 9497 | 322 |
| 323 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: | |
| 10951 | 324 if test x"$ax_pthread_ok" = xyes; then |
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325 ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1]) |
| 9497 | 326 : |
| 327 else | |
| 10951 | 328 ax_pthread_ok=no |
| 9497 | 329 $2 |
| 330 fi | |
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331 AC_LANG_POP |
| 10951 | 332 ])dnl AX_PTHREAD |