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- dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
- dnl
- dnl @summary figure out how to build C programs using POSIX threads
- dnl
- dnl This macro figures out how to build C programs using POSIX threads.
- dnl It sets the PTHREAD_LIBS output variable to the threads library and
- dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
- dnl C compiler flags that are needed. (The user can also force certain
- dnl compiler flags/libs to be tested by setting these environment
- dnl variables.)
- dnl
- dnl Also sets PTHREAD_CC to any special C compiler that is needed for
- dnl multi-threaded programs (defaults to the value of CC otherwise).
- dnl (This is necessary on AIX to use the special cc_r compiler alias.)
- dnl
- dnl NOTE: You are assumed to not only compile your program with these
- dnl flags, but also link it with them as well. e.g. you should link
- dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
- dnl $LIBS
- dnl
- dnl If you are only building threads programs, you may wish to use
- dnl these variables in your default LIBS, CFLAGS, and CC:
- dnl
- dnl LIBS="$PTHREAD_LIBS $LIBS"
- dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
- dnl CC="$PTHREAD_CC"
- dnl
- dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
- dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
- dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
- dnl
- dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
- dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
- dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
- dnl default action will define HAVE_PTHREAD.
- dnl
- dnl Please let the authors know if this macro fails on any platform, or
- dnl if you have any other suggestions or comments. This macro was based
- dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
- dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
- dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
- dnl We are also grateful for the helpful feedback of numerous users.
- dnl
- dnl @category InstalledPackages
- dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
- dnl @version 2006-05-29
- dnl @license GPLWithACException
- dnl
- dnl Checks for GCC shared/pthread inconsistency based on work by
- dnl Marcin Owsiany <marcin@owsiany.pl>
- AC_DEFUN([ACX_PTHREAD], [
- AC_REQUIRE([AC_CANONICAL_HOST])
- AC_LANG_SAVE
- AC_LANG_C
- acx_pthread_ok=no
- if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
- save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
- save_LIBS="$LIBS"
- LIBS="$PTHREAD_LIBS $LIBS"
- AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
- AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
- AC_MSG_RESULT($acx_pthread_ok)
- if test x"$acx_pthread_ok" = xno; then
- PTHREAD_LIBS=""
- PTHREAD_CFLAGS=""
- fi
- LIBS="$save_LIBS"
- CFLAGS="$save_CFLAGS"
- fi
- acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
- case "${host_cpu}-${host_os}" in
- *solaris*)
-
-
-
-
-
-
-
- acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
- ;;
- esac
- if test x"$acx_pthread_ok" = xno; then
- for flag in $acx_pthread_flags; do
- case $flag in
- none)
- AC_MSG_CHECKING([whether pthreads work without any flags])
- ;;
- -*)
- AC_MSG_CHECKING([whether pthreads work with $flag])
- PTHREAD_CFLAGS="$flag"
- ;;
- pthread-config)
- AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
- if test x"$acx_pthread_config" = xno; then continue; fi
- PTHREAD_CFLAGS="`pthread-config --cflags`"
- PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
- ;;
- *)
- AC_MSG_CHECKING([for the pthreads library -l$flag])
- PTHREAD_LIBS="-l$flag"
- ;;
- esac
- save_LIBS="$LIBS"
- save_CFLAGS="$CFLAGS"
- LIBS="$PTHREAD_LIBS $LIBS"
- CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-
-
-
-
-
-
-
-
-
- AC_TRY_LINK([
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [acx_pthread_ok=yes])
- LIBS="$save_LIBS"
- CFLAGS="$save_CFLAGS"
- AC_MSG_RESULT($acx_pthread_ok)
- if test "x$acx_pthread_ok" = xyes; then
- break;
- fi
- PTHREAD_LIBS=""
- PTHREAD_CFLAGS=""
- done
- fi
- if test "x$acx_pthread_ok" = xyes; then
- save_LIBS="$LIBS"
- LIBS="$PTHREAD_LIBS $LIBS"
- save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-
- AC_MSG_CHECKING([for joinable pthread attribute])
- attr_name=unknown
- for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
- AC_TRY_LINK([
- [attr_name=$attr; break])
- done
- AC_MSG_RESULT($attr_name)
- if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
- AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
- [Define to necessary symbol if this constant
- uses a non-standard name on your system.])
- fi
- AC_MSG_CHECKING([if more special flags are required for pthreads])
- flag=no
- case "${host_cpu}-${host_os}" in
- *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
- *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
- esac
- AC_MSG_RESULT(${flag})
- if test "x$flag" != xno; then
- PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
- fi
- LIBS="$save_LIBS"
- CFLAGS="$save_CFLAGS"
-
- if test x"$GCC" != xyes; then
- AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
- else
- PTHREAD_CC=$CC
- fi
-
-
-
-
-
-
-
-
- save_CFLAGS="$CFLAGS"
- save_LIBS="$LIBS"
- save_CC="$CC"
-
-
-
-
-
-
-
-
-
- CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
- LIBS="$PTHREAD_LIBS $LIBS"
- CC="$PTHREAD_CC"
-
-
-
- done="no"
-
-
-
-
- if test x"$done" = xno; then
- AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
- AC_TRY_LINK(,, , [done=yes])
-
- if test "x$done" = xyes ; then
- AC_MSG_RESULT([no])
- else
- AC_MSG_RESULT([yes])
- fi
- fi
-
- if test x"$done" = xno; then
- AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
- AC_TRY_LINK([
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [done=yes])
-
- if test "x$done" = xyes; then
- AC_MSG_RESULT([yes])
- else
- AC_MSG_RESULT([no])
- fi
- fi
-
-
-
-
-
- if test x"$done" = xno; then
- AC_MSG_CHECKING([whether -lpthread fixes that])
- LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
- AC_TRY_LINK([
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [done=yes])
-
- if test "x$done" = xyes; then
- AC_MSG_RESULT([yes])
- PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
- else
- AC_MSG_RESULT([no])
- fi
- fi
-
-
-
- if test x"$done" = xno; then
- AC_MSG_CHECKING([whether -lc_r fixes that])
- LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
- AC_TRY_LINK([
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [done=yes])
-
- if test "x$done" = xyes; then
- AC_MSG_RESULT([yes])
- PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
- else
- AC_MSG_RESULT([no])
- fi
- fi
- if test x"$done" = xno; then
-
- AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
-
-
- acx_pthread_ok=no
- fi
-
- CFLAGS="$save_CFLAGS"
- LIBS="$save_LIBS"
- CC="$save_CC"
- else
- PTHREAD_CC="$CC"
- fi
- AC_SUBST(PTHREAD_LIBS)
- AC_SUBST(PTHREAD_CFLAGS)
- AC_SUBST(PTHREAD_CC)
- if test x"$acx_pthread_ok" = xyes; then
- ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
- :
- else
- acx_pthread_ok=no
- $2
- fi
- AC_LANG_RESTORE
- ])dnl ACX_PTHREAD
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