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ax_pthread.m4 13 KB

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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. #serial 20
  85. AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
  86. AC_DEFUN([AX_PTHREAD], [
  87. AC_REQUIRE([AC_CANONICAL_HOST])
  88. AC_LANG_PUSH([C])
  89. ax_pthread_ok=no
  90. # We used to check for pthread.h first, but this fails if pthread.h
  91. # requires special compiler flags (e.g. on True64 or Sequent).
  92. # It gets checked for in the link test anyway.
  93. # First of all, check if the user has set any of the PTHREAD_LIBS,
  94. # etcetera environment variables, and if threads linking works using
  95. # them:
  96. if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
  97. save_CFLAGS="$CFLAGS"
  98. CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
  99. save_LIBS="$LIBS"
  100. LIBS="$PTHREAD_LIBS $LIBS"
  101. AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
  102. AC_TRY_LINK_FUNC(pthread_join, ax_pthread_ok=yes)
  103. AC_MSG_RESULT($ax_pthread_ok)
  104. if test x"$ax_pthread_ok" = xno; then
  105. PTHREAD_LIBS=""
  106. PTHREAD_CFLAGS=""
  107. fi
  108. LIBS="$save_LIBS"
  109. CFLAGS="$save_CFLAGS"
  110. fi
  111. # We must check for the threads library under a number of different
  112. # names; the ordering is very important because some systems
  113. # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
  114. # libraries is broken (non-POSIX).
  115. # Create a list of thread flags to try. Items starting with a "-" are
  116. # C compiler flags, and other items are library names, except for "none"
  117. # which indicates that we try without any flags at all, and "pthread-config"
  118. # which is a program returning the flags for the Pth emulation library.
  119. ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
  120. # The ordering *is* (sometimes) important. Some notes on the
  121. # individual items follow:
  122. # pthreads: AIX (must check this before -lpthread)
  123. # none: in case threads are in libc; should be tried before -Kthread and
  124. # other compiler flags to prevent continual compiler warnings
  125. # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
  126. # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
  127. # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
  128. # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
  129. # -pthreads: Solaris/gcc
  130. # -mthreads: Mingw32/gcc, Lynx/gcc
  131. # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
  132. # doesn't hurt to check since this sometimes defines pthreads too;
  133. # also defines -D_REENTRANT)
  134. # ... -mt is also the pthreads flag for HP/aCC
  135. # pthread: Linux, etcetera
  136. # --thread-safe: KAI C++
  137. # pthread-config: use pthread-config program (for GNU Pth library)
  138. case ${host_os} in
  139. solaris*)
  140. # On Solaris (at least, for some versions), libc contains stubbed
  141. # (non-functional) versions of the pthreads routines, so link-based
  142. # tests will erroneously succeed. (We need to link with -pthreads/-mt/
  143. # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
  144. # a function called by this macro, so we could check for that, but
  145. # who knows whether they'll stub that too in a future libc.) So,
  146. # we'll just look for -pthreads and -lpthread first:
  147. ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
  148. ;;
  149. darwin*)
  150. AC_REQUIRE([WOLFSSL_DARWIN_USING_CLANG])
  151. AS_IF([test x"$wolfssl_darwin_clang" = x"yes"],
  152. [ax_pthread_flags="$ax_pthread_flags"],
  153. [ax_pthread_flags="-pthread $ax_pthread_flags"])
  154. ;;
  155. esac
  156. if test x"$ax_pthread_ok" = xno; then
  157. for flag in $ax_pthread_flags; do
  158. case $flag in
  159. none)
  160. AC_MSG_CHECKING([whether pthreads work without any flags])
  161. ;;
  162. -*)
  163. AC_MSG_CHECKING([whether pthreads work with $flag])
  164. PTHREAD_CFLAGS="$flag"
  165. ;;
  166. pthread-config)
  167. AC_CHECK_PROG(ax_pthread_config, pthread-config, yes, no)
  168. if test x"$ax_pthread_config" = xno; then continue; fi
  169. PTHREAD_CFLAGS="`pthread-config --cflags`"
  170. PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
  171. ;;
  172. *)
  173. AC_MSG_CHECKING([for the pthreads library -l$flag])
  174. PTHREAD_LIBS="-l$flag"
  175. ;;
  176. esac
  177. save_LIBS="$LIBS"
  178. save_CFLAGS="$CFLAGS"
  179. LIBS="$PTHREAD_LIBS $LIBS"
  180. CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
  181. # Check for various functions. We must include pthread.h,
  182. # since some functions may be macros. (On the Sequent, we
  183. # need a special flag -Kthread to make this header compile.)
  184. # We check for pthread_join because it is in -lpthread on IRIX
  185. # while pthread_create is in libc. We check for pthread_attr_init
  186. # due to DEC craziness with -lpthreads. We check for
  187. # pthread_cleanup_push because it is one of the few pthread
  188. # functions on Solaris that doesn't have a non-functional libc stub.
  189. # We try pthread_create on general principles.
  190. AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
  191. static void routine(void *a) { a = 0; }
  192. static void *start_routine(void *a) { return a; }],
  193. [pthread_t th; pthread_attr_t attr;
  194. pthread_create(&th, 0, start_routine, 0);
  195. pthread_join(th, 0);
  196. pthread_attr_init(&attr);
  197. pthread_cleanup_push(routine, 0);
  198. pthread_cleanup_pop(0) /* ; */])],
  199. [ax_pthread_ok=yes],
  200. [])
  201. LIBS="$save_LIBS"
  202. CFLAGS="$save_CFLAGS"
  203. AC_MSG_RESULT($ax_pthread_ok)
  204. if test "x$ax_pthread_ok" = xyes; then
  205. break;
  206. fi
  207. PTHREAD_LIBS=""
  208. PTHREAD_CFLAGS=""
  209. done
  210. fi
  211. # Various other checks:
  212. if test "x$ax_pthread_ok" = xyes; then
  213. save_LIBS="$LIBS"
  214. LIBS="$PTHREAD_LIBS $LIBS"
  215. save_CFLAGS="$CFLAGS"
  216. CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
  217. # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
  218. AC_MSG_CHECKING([for joinable pthread attribute])
  219. attr_name=unknown
  220. for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
  221. AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
  222. [int attr = $attr; return attr /* ; */])],
  223. [attr_name=$attr; break],
  224. [])
  225. done
  226. AC_MSG_RESULT($attr_name)
  227. if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
  228. AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
  229. [Define to necessary symbol if this constant
  230. uses a non-standard name on your system.])
  231. fi
  232. AC_MSG_CHECKING([if more special flags are required for pthreads])
  233. flag=no
  234. case ${host_os} in
  235. aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
  236. osf* | hpux*) flag="-D_REENTRANT";;
  237. solaris*)
  238. if test "$GCC" = "yes"; then
  239. flag="-D_REENTRANT"
  240. else
  241. flag="-mt -D_REENTRANT"
  242. fi
  243. ;;
  244. esac
  245. AC_MSG_RESULT(${flag})
  246. if test "x$flag" != xno; then
  247. PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
  248. fi
  249. AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
  250. ax_cv_PTHREAD_PRIO_INHERIT, [
  251. AC_LINK_IFELSE([
  252. AC_LANG_PROGRAM([[#include <pthread.h>]], [[int i = PTHREAD_PRIO_INHERIT;]])],
  253. [ax_cv_PTHREAD_PRIO_INHERIT=yes],
  254. [ax_cv_PTHREAD_PRIO_INHERIT=no])
  255. ])
  256. AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
  257. AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.]))
  258. LIBS="$save_LIBS"
  259. CFLAGS="$save_CFLAGS"
  260. # More AIX lossage: compile with *_r variant
  261. if test "x$GCC" != xyes; then
  262. case $host_os in
  263. aix*)
  264. AS_CASE(["x/$CC"],
  265. [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
  266. [#handle absolute path differently from PATH based program lookup
  267. AS_CASE(["x$CC"],
  268. [x/*],
  269. [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
  270. [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
  271. ;;
  272. esac
  273. fi
  274. fi
  275. test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
  276. AC_SUBST(PTHREAD_LIBS)
  277. AC_SUBST(PTHREAD_CFLAGS)
  278. AC_SUBST(PTHREAD_CC)
  279. # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
  280. if test x"$ax_pthread_ok" = xyes; then
  281. ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
  282. :
  283. else
  284. ax_pthread_ok=no
  285. $2
  286. fi
  287. AC_LANG_POP
  288. ])dnl AX_PTHREAD