| commit | author | age | ||
| 8c7455 | 1 | # =========================================================================== |
| JS | 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 17 | |
| 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}-${host_os}" in | |
| 258 | *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; | |
| 259 | *-osf* | *-hpux*) flag="-D_REENTRANT";; | |
| 260 | *solaris*) | |
| 261 | if test "$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 | |
