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update acx_pthread.m4
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1364 fefdeb5f-60dc-0310-8127-8f9354f1896f
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Lennart Poettering
parent
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commit
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1 changed files with 177 additions and 40 deletions
207
acinclude.m4
207
acinclude.m4
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@ -1,6 +1,55 @@
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dnl Available from the GNU Autoconf Macro Archive at:
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dnl http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html
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dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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dnl
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dnl @summary figure out how to build C programs using POSIX threads
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dnl
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dnl This macro figures out how to build C programs using POSIX threads.
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dnl It sets the PTHREAD_LIBS output variable to the threads library and
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dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
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dnl C compiler flags that are needed. (The user can also force certain
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dnl compiler flags/libs to be tested by setting these environment
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dnl variables.)
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dnl
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dnl Also sets PTHREAD_CC to any special C compiler that is needed for
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dnl multi-threaded programs (defaults to the value of CC otherwise).
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dnl (This is necessary on AIX to use the special cc_r compiler alias.)
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dnl
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dnl NOTE: You are assumed to not only compile your program with these
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dnl flags, but also link it with them as well. e.g. you should link
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dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
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dnl $LIBS
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dnl
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dnl If you are only building threads programs, you may wish to use
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dnl these variables in your default LIBS, CFLAGS, and CC:
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dnl
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dnl LIBS="$PTHREAD_LIBS $LIBS"
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dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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dnl CC="$PTHREAD_CC"
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dnl
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dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
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dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
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dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
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dnl
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dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
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dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
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dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
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dnl default action will define HAVE_PTHREAD.
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dnl
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dnl Please let the authors know if this macro fails on any platform, or
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dnl if you have any other suggestions or comments. This macro was based
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dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
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dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
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dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
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dnl We are also grateful for the helpful feedback of numerous users.
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dnl
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dnl @category InstalledPackages
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dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
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dnl @version 2006-05-29
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dnl @license GPLWithACException
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dnl
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dnl Checks for GCC shared/pthread inconsistency based on work by
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dnl Marcin Owsiany <marcin@owsiany.pl>
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AC_DEFUN([ACX_PTHREAD], [
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_LANG_SAVE
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@ -57,6 +106,7 @@ acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -m
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# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
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# doesn't hurt to check since this sometimes defines pthreads too;
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# also defines -D_REENTRANT)
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# ... -mt is also the pthreads flag for HP/aCC
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# pthread: Linux, etcetera
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# --thread-safe: KAI C++
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# pthread-config: use pthread-config program (for GNU Pth library)
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@ -66,13 +116,13 @@ case "${host_cpu}-${host_os}" in
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# On Solaris (at least, for some versions), libc contains stubbed
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# (non-functional) versions of the pthreads routines, so link-based
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# tests will erroneously succeed. (We need to link with -pthread or
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# tests will erroneously succeed. (We need to link with -pthreads/-mt/
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# -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
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# a function called by this macro, so we could check for that, but
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# who knows whether they'll stub that too in a future libc.) So,
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# we'll just look for -pthreads and -lpthread first:
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acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
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acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
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;;
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esac
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@ -142,26 +192,19 @@ if test "x$acx_pthread_ok" = xyes; then
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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# Detect AIX lossage: threads are created detached by default
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# and the JOINABLE attribute has a nonstandard name (UNDETACHED).
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# Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
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AC_MSG_CHECKING([for joinable pthread attribute])
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AC_TRY_LINK([#include <pthread.h>],
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[int attr=PTHREAD_CREATE_JOINABLE;],
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ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
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if test x"$ok" = xunknown; then
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AC_TRY_LINK([#include <pthread.h>],
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[int attr=PTHREAD_CREATE_UNDETACHED;],
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ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
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fi
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if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
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AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
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[Define to the necessary symbol if this constant
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attr_name=unknown
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for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
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AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
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[attr_name=$attr; break])
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done
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AC_MSG_RESULT($attr_name)
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if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
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AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
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[Define to necessary symbol if this constant
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uses a non-standard name on your system.])
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fi
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AC_MSG_RESULT(${ok})
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if test x"$ok" = xunknown; then
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AC_MSG_WARN([we do not know how to create joinable pthreads])
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fi
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AC_MSG_CHECKING([if more special flags are required for pthreads])
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flag=no
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@ -174,22 +217,117 @@ if test "x$acx_pthread_ok" = xyes; then
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PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
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fi
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AC_MSG_CHECKING([if pthread_yield is available])
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flag=no
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AC_TRY_LINK([#include <pthread.h>],
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[pthread_yield();],
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[flag=yes])
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AC_MSG_RESULT(${flag})
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if test "x$flag" != xno; then
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AC_DEFINE(HAVE_PTHREAD_YIELD, 1,
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[Define to 1 if you have the 'pthread_yield' function.])
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fi
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LIBS="$save_LIBS"
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CFLAGS="$save_CFLAGS"
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# More AIX lossage: must compile with xlc_r or cc_r
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if test x"$GCC" != xyes; then
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AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
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else
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PTHREAD_CC=$CC
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fi
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# More AIX lossage: must compile with cc_r
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AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
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# The next part tries to detect GCC inconsistency with -shared on some
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# architectures and systems. The problem is that in certain
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# configurations, when -shared is specified, GCC "forgets" to
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# internally use various flags which are still necessary.
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AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
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check_inconsistencies=yes
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case "${host_cpu}-${host_os}" in
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*-darwin*) check_inconsistencies=no ;;
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esac
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if test x"$GCC" != xyes -o "x$check_inconsistencies" != xyes ; then
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AC_MSG_RESULT([no])
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else
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AC_MSG_RESULT([yes])
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# In order not to create several levels of indentation, we test
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# the value of "$ok" until we find out the cure or run out of
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# ideas.
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ok="no"
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#
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# Prepare the flags
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#
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save_CFLAGS="$CFLAGS"
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save_LIBS="$LIBS"
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save_CC="$CC"
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# Try with the flags determined by the earlier checks.
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#
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# -Wl,-z,defs forces link-time symbol resolution, so that the
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# linking checks with -shared actually have any value
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#
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# FIXME: -fPIC is required for -shared on many architectures,
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# so we specify it here, but the right way would probably be to
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# properly detect whether it is actually required.
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CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
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LIBS="$PTHREAD_LIBS $LIBS"
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CC="$PTHREAD_CC"
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AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
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AC_TRY_LINK([#include <pthread.h>],
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[pthread_t th; pthread_join(th, 0);
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pthread_attr_init(0); pthread_cleanup_push(0, 0);
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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[ok=yes])
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if test "x$ok" = xyes; then
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AC_MSG_RESULT([yes])
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else
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AC_MSG_RESULT([no])
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fi
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#
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# Linux gcc on some architectures such as mips/mipsel forgets
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# about -lpthread
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#
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if test x"$ok" = xno; then
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AC_MSG_CHECKING([whether -lpthread fixes that])
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LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
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AC_TRY_LINK([#include <pthread.h>],
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[pthread_t th; pthread_join(th, 0);
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pthread_attr_init(0); pthread_cleanup_push(0, 0);
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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[ok=yes])
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if test "x$ok" = xyes; then
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AC_MSG_RESULT([yes])
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PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
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else
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AC_MSG_RESULT([no])
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fi
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fi
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#
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# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
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#
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if test x"$ok" = xno; then
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AC_MSG_CHECKING([whether -lc_r fixes that])
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LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
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AC_TRY_LINK([#include <pthread.h>],
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[pthread_t th; pthread_join(th, 0);
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pthread_attr_init(0); pthread_cleanup_push(0, 0);
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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[ok=yes])
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if test "x$ok" = xyes; then
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AC_MSG_RESULT([yes])
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PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
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else
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AC_MSG_RESULT([no])
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fi
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fi
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if test x"$ok" = xno; then
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# OK, we have run out of ideas
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AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
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# so it's not safe to assume that we may use pthreads
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acx_pthread_ok=no
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fi
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CFLAGS="$save_CFLAGS"
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LIBS="$save_LIBS"
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CC="$save_CC"
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fi
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else
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PTHREAD_CC="$CC"
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fi
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@ -208,7 +346,6 @@ else
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fi
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AC_LANG_RESTORE
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])dnl ACX_PTHREAD
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AC_DEFUN([AC_CHECK_DEFINE],[
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AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$1_$2])dnl
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AC_CACHE_CHECK([for $1 in $2], ac_var,
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