Annotation of embedaddon/pcre/m4/ax_pthread.m4, revision 1.1
1.1 ! misho 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 18
! 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 $ax_pthread_flags"
! 164: ;;
! 165: esac
! 166:
! 167: if test x"$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 ${host_os} in
! 258: aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
! 259: osf* | hpux*) flag="-D_REENTRANT";;
! 260: solaris*)
! 261: if test "$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
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