| 1 | # This was retrieved from
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| 2 | # http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi
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| 3 | # See also (perhaps for new versions?)
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| 4 | # http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi
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| 5 | #
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| 6 | # We've rewritten the inconsistency check code (from avahi), to work
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| 7 | # more broadly. In particular, it no longer assumes ld accepts -zdefs.
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| 8 | # This caused a restructing of the code, but the functionality has only
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| 9 | # changed a little.
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| 10 |
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| 11 | dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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| 12 | dnl
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| 13 | dnl @summary figure out how to build C programs using POSIX threads
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| 14 | dnl
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| 15 | dnl This macro figures out how to build C programs using POSIX threads.
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| 16 | dnl It sets the PTHREAD_LIBS output variable to the threads library and
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| 17 | dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
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| 18 | dnl C compiler flags that are needed. (The user can also force certain
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| 19 | dnl compiler flags/libs to be tested by setting these environment
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| 20 | dnl variables.)
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| 21 | dnl
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| 22 | dnl Also sets PTHREAD_CC to any special C compiler that is needed for
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| 23 | dnl multi-threaded programs (defaults to the value of CC otherwise).
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| 24 | dnl (This is necessary on AIX to use the special cc_r compiler alias.)
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| 25 | dnl
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| 26 | dnl NOTE: You are assumed to not only compile your program with these
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| 27 | dnl flags, but also link it with them as well. e.g. you should link
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| 28 | dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
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| 29 | dnl $LIBS
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| 30 | dnl
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| 31 | dnl If you are only building threads programs, you may wish to use
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| 32 | dnl these variables in your default LIBS, CFLAGS, and CC:
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| 33 | dnl
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| 34 | dnl LIBS="$PTHREAD_LIBS $LIBS"
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| 35 | dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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| 36 | dnl CC="$PTHREAD_CC"
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| 37 | dnl
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| 38 | dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
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| 39 | dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
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| 40 | dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
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| 41 | dnl
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| 42 | dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
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| 43 | dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
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| 44 | dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
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| 45 | dnl default action will define HAVE_PTHREAD.
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| 46 | dnl
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| 47 | dnl Please let the authors know if this macro fails on any platform, or
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| 48 | dnl if you have any other suggestions or comments. This macro was based
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| 49 | dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
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| 50 | dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
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| 51 | dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
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| 52 | dnl We are also grateful for the helpful feedback of numerous users.
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| 53 | dnl
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| 54 | dnl @category InstalledPackages
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| 55 | dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
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| 56 | dnl @version 2006-05-29
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| 57 | dnl @license GPLWithACException
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| 58 | dnl
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| 59 | dnl Checks for GCC shared/pthread inconsistency based on work by
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| 60 | dnl Marcin Owsiany <marcin@owsiany.pl>
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| 61 |
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| 62 |
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| 63 | AC_DEFUN([ACX_PTHREAD], [
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| 64 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 65 | AC_LANG_SAVE
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| 66 | AC_LANG_C
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| 67 | acx_pthread_ok=no
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| 68 |
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| 69 | # We used to check for pthread.h first, but this fails if pthread.h
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| 70 | # requires special compiler flags (e.g. on True64 or Sequent).
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| 71 | # It gets checked for in the link test anyway.
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| 72 |
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| 73 | # First of all, check if the user has set any of the PTHREAD_LIBS,
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| 74 | # etcetera environment variables, and if threads linking works using
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| 75 | # them:
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| 76 | if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
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| 77 | save_CFLAGS="$CFLAGS"
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| 78 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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| 79 | save_LIBS="$LIBS"
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| 80 | LIBS="$PTHREAD_LIBS $LIBS"
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| 81 | AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
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| 82 | AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
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| 83 | AC_MSG_RESULT($acx_pthread_ok)
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| 84 | if test x"$acx_pthread_ok" = xno; then
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| 85 | PTHREAD_LIBS=""
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| 86 | PTHREAD_CFLAGS=""
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| 87 | fi
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| 88 | LIBS="$save_LIBS"
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| 89 | CFLAGS="$save_CFLAGS"
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| 90 | fi
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| 91 |
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| 92 | # We must check for the threads library under a number of different
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| 93 | # names; the ordering is very important because some systems
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| 94 | # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
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| 95 | # libraries is broken (non-POSIX).
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| 96 |
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| 97 | # Create a list of thread flags to try. Items starting with a "-" are
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| 98 | # C compiler flags, and other items are library names, except for "none"
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| 99 | # which indicates that we try without any flags at all, and "pthread-config"
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| 100 | # which is a program returning the flags for the Pth emulation library.
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| 101 |
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| 102 | acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
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| 103 |
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| 104 | # The ordering *is* (sometimes) important. Some notes on the
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| 105 | # individual items follow:
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| 106 |
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| 107 | # pthreads: AIX (must check this before -lpthread)
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| 108 | # none: in case threads are in libc; should be tried before -Kthread and
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| 109 | # other compiler flags to prevent continual compiler warnings
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| 110 | # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
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| 111 | # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
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| 112 | # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
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| 113 | # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
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| 114 | # -pthreads: Solaris/gcc
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| 115 | # -mthreads: Mingw32/gcc, Lynx/gcc
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| 116 | # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
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| 117 | # doesn't hurt to check since this sometimes defines pthreads too;
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| 118 | # also defines -D_REENTRANT)
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| 119 | # ... -mt is also the pthreads flag for HP/aCC
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| 120 | # pthread: Linux, etcetera
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| 121 | # --thread-safe: KAI C++
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| 122 | # pthread-config: use pthread-config program (for GNU Pth library)
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| 123 |
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| 124 | case "${host_cpu}-${host_os}" in
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| 125 | *solaris*)
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| 126 |
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| 127 | # On Solaris (at least, for some versions), libc contains stubbed
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| 128 | # (non-functional) versions of the pthreads routines, so link-based
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| 129 | # tests will erroneously succeed. (We need to link with -pthreads/-mt/
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| 130 | # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
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| 131 | # a function called by this macro, so we could check for that, but
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| 132 | # who knows whether they'll stub that too in a future libc.) So,
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| 133 | # we'll just look for -pthreads and -lpthread first:
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| 134 |
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| 135 | acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
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| 136 | ;;
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| 137 | esac
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| 138 |
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| 139 | if test x"$acx_pthread_ok" = xno; then
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| 140 | for flag in $acx_pthread_flags; do
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| 141 |
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| 142 | case $flag in
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| 143 | none)
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| 144 | AC_MSG_CHECKING([whether pthreads work without any flags])
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| 145 | ;;
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| 146 |
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| 147 | -*)
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| 148 | AC_MSG_CHECKING([whether pthreads work with $flag])
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| 149 | PTHREAD_CFLAGS="$flag"
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| 150 | ;;
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| 151 |
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| 152 | pthread-config)
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| 153 | AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
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| 154 | if test x"$acx_pthread_config" = xno; then continue; fi
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| 155 | PTHREAD_CFLAGS="`pthread-config --cflags`"
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| 156 | PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
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| 157 | ;;
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| 158 |
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| 159 | *)
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| 160 | AC_MSG_CHECKING([for the pthreads library -l$flag])
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| 161 | PTHREAD_LIBS="-l$flag"
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| 162 | ;;
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| 163 | esac
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| 164 |
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| 165 | save_LIBS="$LIBS"
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| 166 | save_CFLAGS="$CFLAGS"
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| 167 | LIBS="$PTHREAD_LIBS $LIBS"
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| 168 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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| 169 |
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| 170 | # Check for various functions. We must include pthread.h,
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| 171 | # since some functions may be macros. (On the Sequent, we
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| 172 | # need a special flag -Kthread to make this header compile.)
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| 173 | # We check for pthread_join because it is in -lpthread on IRIX
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| 174 | # while pthread_create is in libc. We check for pthread_attr_init
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| 175 | # due to DEC craziness with -lpthreads. We check for
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| 176 | # pthread_cleanup_push because it is one of the few pthread
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| 177 | # functions on Solaris that doesn't have a non-functional libc stub.
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| 178 | # We try pthread_create on general principles.
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| 179 | AC_TRY_LINK([#include <pthread.h>],
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| 180 | [pthread_t th; pthread_join(th, 0);
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| 181 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
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| 182 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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| 183 | [acx_pthread_ok=yes])
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| 184 |
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| 185 | LIBS="$save_LIBS"
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| 186 | CFLAGS="$save_CFLAGS"
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| 187 |
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| 188 | AC_MSG_RESULT($acx_pthread_ok)
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| 189 | if test "x$acx_pthread_ok" = xyes; then
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| 190 | break;
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| 191 | fi
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| 192 |
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| 193 | PTHREAD_LIBS=""
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| 194 | PTHREAD_CFLAGS=""
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| 195 | done
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| 196 | fi
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| 197 |
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| 198 | # Various other checks:
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| 199 | if test "x$acx_pthread_ok" = xyes; then
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| 200 | save_LIBS="$LIBS"
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| 201 | LIBS="$PTHREAD_LIBS $LIBS"
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| 202 | save_CFLAGS="$CFLAGS"
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| 203 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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| 204 |
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| 205 | # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
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| 206 | AC_MSG_CHECKING([for joinable pthread attribute])
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| 207 | attr_name=unknown
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| 208 | for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
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| 209 | AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
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| 210 | [attr_name=$attr; break])
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| 211 | done
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| 212 | AC_MSG_RESULT($attr_name)
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| 213 | if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
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| 214 | AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
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| 215 | [Define to necessary symbol if this constant
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| 216 | uses a non-standard name on your system.])
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| 217 | fi
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| 218 |
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| 219 | AC_MSG_CHECKING([if more special flags are required for pthreads])
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| 220 | flag=no
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| 221 | case "${host_cpu}-${host_os}" in
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| 222 | *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
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| 223 | *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
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| 224 | esac
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| 225 | AC_MSG_RESULT(${flag})
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| 226 | if test "x$flag" != xno; then
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| 227 | PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
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| 228 | fi
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| 229 |
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| 230 | LIBS="$save_LIBS"
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| 231 | CFLAGS="$save_CFLAGS"
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| 232 | # More AIX lossage: must compile with xlc_r or cc_r
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| 233 | if test x"$GCC" != xyes; then
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| 234 | AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
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| 235 | else
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| 236 | PTHREAD_CC=$CC
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| 237 | fi
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| 238 |
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| 239 | # The next part tries to detect GCC inconsistency with -shared on some
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| 240 | # architectures and systems. The problem is that in certain
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| 241 | # configurations, when -shared is specified, GCC "forgets" to
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| 242 | # internally use various flags which are still necessary.
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| 243 |
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| 244 | #
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| 245 | # Prepare the flags
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| 246 | #
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| 247 | save_CFLAGS="$CFLAGS"
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| 248 | save_LIBS="$LIBS"
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| 249 | save_CC="$CC"
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| 250 |
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| 251 | # Try with the flags determined by the earlier checks.
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| 252 | #
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| 253 | # -Wl,-z,defs forces link-time symbol resolution, so that the
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| 254 | # linking checks with -shared actually have any value
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| 255 | #
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| 256 | # FIXME: -fPIC is required for -shared on many architectures,
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| 257 | # so we specify it here, but the right way would probably be to
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| 258 | # properly detect whether it is actually required.
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| 259 | CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
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| 260 | LIBS="$PTHREAD_LIBS $LIBS"
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| 261 | CC="$PTHREAD_CC"
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| 262 |
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| 263 | # In order not to create several levels of indentation, we test
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| 264 | # the value of "$done" until we find the cure or run out of ideas.
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| 265 | done="no"
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| 266 |
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| 267 | # First, make sure the CFLAGS we added are actually accepted by our
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| 268 | # compiler. If not (and OS X's ld, for instance, does not accept -z),
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| 269 | # then we can't do this test.
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| 270 | if test x"$done" = xno; then
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| 271 | AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
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| 272 | AC_TRY_LINK(,, , [done=yes])
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| 273 |
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| 274 | if test "x$done" = xyes ; then
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| 275 | AC_MSG_RESULT([no])
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| 276 | else
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| 277 | AC_MSG_RESULT([yes])
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| 278 | fi
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| 279 | fi
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| 280 |
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| 281 | if test x"$done" = xno; then
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| 282 | AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
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| 283 | AC_TRY_LINK([#include <pthread.h>],
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| 284 | [pthread_t th; pthread_join(th, 0);
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| 285 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
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| 286 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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| 287 | [done=yes])
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| 288 |
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| 289 | if test "x$done" = xyes; then
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| 290 | AC_MSG_RESULT([yes])
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| 291 | else
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| 292 | AC_MSG_RESULT([no])
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| 293 | fi
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| 294 | fi
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| 295 |
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| 296 | #
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| 297 | # Linux gcc on some architectures such as mips/mipsel forgets
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| 298 | # about -lpthread
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| 299 | #
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| 300 | if test x"$done" = xno; then
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| 301 | AC_MSG_CHECKING([whether -lpthread fixes that])
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| 302 | LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
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| 303 | AC_TRY_LINK([#include <pthread.h>],
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| 304 | [pthread_t th; pthread_join(th, 0);
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| 305 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
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| 306 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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| 307 | [done=yes])
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| 308 |
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| 309 | if test "x$done" = xyes; then
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| 310 | AC_MSG_RESULT([yes])
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| 311 | PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
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| 312 | else
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| 313 | AC_MSG_RESULT([no])
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| 314 | fi
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| 315 | fi
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| 316 | #
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| 317 | # FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
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| 318 | #
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| 319 | if test x"$done" = xno; then
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| 320 | AC_MSG_CHECKING([whether -lc_r fixes that])
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| 321 | LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
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| 322 | AC_TRY_LINK([#include <pthread.h>],
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| 323 | [pthread_t th; pthread_join(th, 0);
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| 324 | pthread_attr_init(0); pthread_cleanup_push(0, 0);
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| 325 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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| 326 | [done=yes])
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| 327 |
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| 328 | if test "x$done" = xyes; then
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| 329 | AC_MSG_RESULT([yes])
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| 330 | PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
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| 331 | else
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| 332 | AC_MSG_RESULT([no])
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| 333 | fi
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| 334 | fi
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| 335 | if test x"$done" = xno; then
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| 336 | # OK, we have run out of ideas
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| 337 | AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
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| 338 |
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| 339 | # so it's not safe to assume that we may use pthreads
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| 340 | acx_pthread_ok=no
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| 341 | fi
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| 342 |
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| 343 | CFLAGS="$save_CFLAGS"
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| 344 | LIBS="$save_LIBS"
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| 345 | CC="$save_CC"
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| 346 | else
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| 347 | PTHREAD_CC="$CC"
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| 348 | fi
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| 349 |
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| 350 | AC_SUBST(PTHREAD_LIBS)
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| 351 | AC_SUBST(PTHREAD_CFLAGS)
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| 352 | AC_SUBST(PTHREAD_CC)
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| 353 |
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| 354 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
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| 355 | if test x"$acx_pthread_ok" = xyes; then
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| 356 | ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
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| 357 | :
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| 358 | else
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| 359 | acx_pthread_ok=no
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| 360 | $2
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| 361 | fi
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| 362 | AC_LANG_RESTORE
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| 363 | ])dnl ACX_PTHREAD
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