john hood
9 years ago
parent
5e933847cc
commit
cab5eae3e0
3 changed files with 487 additions and 400 deletions
@ -1,397 +0,0 @@ |
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# This was retrieved from |
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# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi |
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# See also (perhaps for new versions?) |
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# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi |
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# |
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# We've rewritten the inconsistency check code (from avahi), to work |
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# more broadly. In particular, it no longer assumes ld accepts -zdefs. |
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# This caused a restructing of the code, but the functionality has only |
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# changed a little. |
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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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AC_LANG_C |
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acx_pthread_ok=no |
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# We used to check for pthread.h first, but this fails if pthread.h |
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# requires special compiler flags (e.g. on True64 or Sequent). |
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# It gets checked for in the link test anyway. |
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# First of all, check if the user has set any of the PTHREAD_LIBS, |
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# etcetera environment variables, and if threads linking works using |
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# them: |
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if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then |
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save_CFLAGS="$CFLAGS" |
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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save_LIBS="$LIBS" |
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LIBS="$PTHREAD_LIBS $LIBS" |
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AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) |
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AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) |
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AC_MSG_RESULT($acx_pthread_ok) |
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if test x"$acx_pthread_ok" = xno; then |
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PTHREAD_LIBS="" |
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PTHREAD_CFLAGS="" |
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fi |
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LIBS="$save_LIBS" |
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CFLAGS="$save_CFLAGS" |
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fi |
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# We must check for the threads library under a number of different |
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# names; the ordering is very important because some systems |
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# (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
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# libraries is broken (non-POSIX). |
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# Create a list of thread flags to try. Items starting with a "-" are |
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# C compiler flags, and other items are library names, except for "none" |
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# which indicates that we try without any flags at all, and "pthread-config" |
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# which is a program returning the flags for the Pth emulation library. |
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acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
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# The ordering *is* (sometimes) important. Some notes on the |
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# individual items follow: |
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# pthreads: AIX (must check this before -lpthread) |
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# none: in case threads are in libc; should be tried before -Kthread and |
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# other compiler flags to prevent continual compiler warnings |
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# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
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# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
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# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
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# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) |
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# -pthreads: Solaris/gcc |
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# -mthreads: Mingw32/gcc, Lynx/gcc |
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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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case "${host_cpu}-${host_os}" in |
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*solaris*) |
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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 -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="-pthreads pthread -mt -pthread $acx_pthread_flags" |
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;; |
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esac |
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if test x"$acx_pthread_ok" = xno; then |
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for flag in $acx_pthread_flags; do |
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case $flag in |
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none) |
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AC_MSG_CHECKING([whether pthreads work without any flags]) |
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;; |
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-*) |
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AC_MSG_CHECKING([whether pthreads work with $flag]) |
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PTHREAD_CFLAGS="$flag" |
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;; |
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pthread-config) |
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AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) |
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if test x"$acx_pthread_config" = xno; then continue; fi |
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PTHREAD_CFLAGS="`pthread-config --cflags`" |
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PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
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;; |
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*) |
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AC_MSG_CHECKING([for the pthreads library -l$flag]) |
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PTHREAD_LIBS="-l$flag" |
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;; |
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esac |
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save_LIBS="$LIBS" |
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save_CFLAGS="$CFLAGS" |
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LIBS="$PTHREAD_LIBS $LIBS" |
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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# Check for various functions. We must include pthread.h, |
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# since some functions may be macros. (On the Sequent, we |
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# need a special flag -Kthread to make this header compile.) |
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# We check for pthread_join because it is in -lpthread on IRIX |
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# while pthread_create is in libc. We check for pthread_attr_init |
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# due to DEC craziness with -lpthreads. We check for |
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# pthread_cleanup_push because it is one of the few pthread |
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# functions on Solaris that doesn't have a non-functional libc stub. |
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# We try pthread_create on general principles. |
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AC_TRY_LINK([#include <pthread.h>], |
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[pthread_t th; pthread_join(th, 0); |
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pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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[acx_pthread_ok=yes]) |
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LIBS="$save_LIBS" |
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CFLAGS="$save_CFLAGS" |
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AC_MSG_RESULT($acx_pthread_ok) |
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if test "x$acx_pthread_ok" = xyes; then |
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break; |
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fi |
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PTHREAD_LIBS="" |
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PTHREAD_CFLAGS="" |
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done |
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fi |
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# Various other checks: |
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if test "x$acx_pthread_ok" = xyes; then |
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save_LIBS="$LIBS" |
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LIBS="$PTHREAD_LIBS $LIBS" |
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save_CFLAGS="$CFLAGS" |
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
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# Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
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AC_MSG_CHECKING([for joinable pthread attribute]) |
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attr_name=unknown |
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for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
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AC_TRY_LINK([#include <pthread.h>], [int attr=$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, $attr_name, |
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[Define to necessary symbol if this constant |
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uses a non-standard name on your system.]) |
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fi |
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AC_MSG_CHECKING([if more special flags are required for pthreads]) |
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flag=no |
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case "${host_cpu}-${host_os}" in |
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*-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; |
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*solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; |
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esac |
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AC_MSG_RESULT(${flag}) |
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if test "x$flag" != xno; then |
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PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" |
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fi |
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LIBS="$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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# 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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# |
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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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# In order not to create several levels of indentation, we test |
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# the value of "$done" until we find the cure or run out of ideas. |
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done="no" |
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# First, make sure the CFLAGS we added are actually accepted by our |
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# compiler. If not (and OS X's ld, for instance, does not accept -z), |
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# then we can't do this test. |
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if test x"$done" = xno; then |
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AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies]) |
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AC_TRY_LINK(,, , [done=yes]) |
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if test "x$done" = xyes ; then |
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AC_MSG_RESULT([no]) |
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else |
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AC_MSG_RESULT([yes]) |
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fi |
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fi |
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if test x"$done" = xno; then |
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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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[done=yes]) |
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if test "x$done" = xyes; then |
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AC_MSG_RESULT([yes]) |
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else |
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AC_MSG_RESULT([no]) |
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fi |
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fi |
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# |
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# Linux gcc on some architectures such as mips/mipsel forgets |
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# about -lpthread |
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# |
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if test x"$done" = xno; then |
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AC_MSG_CHECKING([whether -lpthread fixes that]) |
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LIBS="-lpthread $PTHREAD_LIBS $save_LIBS" |
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AC_TRY_LINK([#include <pthread.h>], |
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[pthread_t th; pthread_join(th, 0); |
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pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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[done=yes]) |
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if test "x$done" = xyes; then |
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AC_MSG_RESULT([yes]) |
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PTHREAD_LIBS="-lpthread $PTHREAD_LIBS" |
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else |
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AC_MSG_RESULT([no]) |
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fi |
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fi |
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# |
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# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc |
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# |
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if test x"$done" = xno; then |
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AC_MSG_CHECKING([whether -lc_r fixes that]) |
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LIBS="-lc_r $PTHREAD_LIBS $save_LIBS" |
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AC_TRY_LINK([#include <pthread.h>], |
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[pthread_t th; pthread_join(th, 0); |
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pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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[done=yes]) |
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if test "x$done" = xyes; then |
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AC_MSG_RESULT([yes]) |
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PTHREAD_LIBS="-lc_r $PTHREAD_LIBS" |
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else |
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AC_MSG_RESULT([no]) |
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fi |
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fi |
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if test x"$done" = 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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AC_MSG_CHECKING([whether what we have so far is sufficient with -nostdlib]) |
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CFLAGS="-nostdlib $CFLAGS" |
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# we need c with nostdlib |
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LIBS="$LIBS -lc" |
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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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[done=yes],[done=no]) |
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if test "x$done" = xyes; then |
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AC_MSG_RESULT([yes]) |
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else |
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AC_MSG_RESULT([no]) |
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fi |
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if test x"$done" = xno; then |
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AC_MSG_CHECKING([whether -lpthread saves the day]) |
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LIBS="-lpthread $LIBS" |
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AC_TRY_LINK([#include <pthread.h>], |
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[pthread_t th; pthread_join(th, 0); |
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pthread_attr_init(0); pthread_cleanup_push(0, 0); |
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pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
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[done=yes],[done=no]) |
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if test "x$done" = xyes; then |
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AC_MSG_RESULT([yes]) |
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PTHREAD_LIBS="$PTHREAD_LIBS -lpthread" |
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else |
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AC_MSG_RESULT([no]) |
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AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries and -nostdlib]) |
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fi |
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fi |
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CFLAGS="$save_CFLAGS" |
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LIBS="$save_LIBS" |
|
||||||
CC="$save_CC" |
|
||||||
else |
|
||||||
PTHREAD_CC="$CC" |
|
||||||
fi |
|
||||||
|
|
||||||
AC_SUBST(PTHREAD_LIBS) |
|
||||||
AC_SUBST(PTHREAD_CFLAGS) |
|
||||||
AC_SUBST(PTHREAD_CC) |
|
||||||
|
|
||||||
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
|
||||||
if test x"$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 |
|
||||||
@ -0,0 +1,485 @@ |
|||||||
|
# =========================================================================== |
||||||
|
# http://www.gnu.org/software/autoconf-archive/ax_pthread.html |
||||||
|
# =========================================================================== |
||||||
|
# |
||||||
|
# SYNOPSIS |
||||||
|
# |
||||||
|
# AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
||||||
|
# |
||||||
|
# DESCRIPTION |
||||||
|
# |
||||||
|
# This macro figures out how to build C programs using POSIX threads. It |
||||||
|
# sets the PTHREAD_LIBS output variable to the threads library and linker |
||||||
|
# flags, and the PTHREAD_CFLAGS output variable to any special C compiler |
||||||
|
# flags that are needed. (The user can also force certain compiler |
||||||
|
# flags/libs to be tested by setting these environment variables.) |
||||||
|
# |
||||||
|
# Also sets PTHREAD_CC to any special C compiler that is needed for |
||||||
|
# multi-threaded programs (defaults to the value of CC otherwise). (This |
||||||
|
# is necessary on AIX to use the special cc_r compiler alias.) |
||||||
|
# |
||||||
|
# NOTE: You are assumed to not only compile your program with these flags, |
||||||
|
# but also to link with them as well. For example, you might link with |
||||||
|
# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
||||||
|
# |
||||||
|
# If you are only building threaded programs, you may wish to use these |
||||||
|
# variables in your default LIBS, CFLAGS, and CC: |
||||||
|
# |
||||||
|
# LIBS="$PTHREAD_LIBS $LIBS" |
||||||
|
# CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
||||||
|
# CC="$PTHREAD_CC" |
||||||
|
# |
||||||
|
# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant |
||||||
|
# has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to |
||||||
|
# that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX). |
||||||
|
# |
||||||
|
# Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the |
||||||
|
# PTHREAD_PRIO_INHERIT symbol is defined when compiling with |
||||||
|
# PTHREAD_CFLAGS. |
||||||
|
# |
||||||
|
# ACTION-IF-FOUND is a list of shell commands to run if a threads library |
||||||
|
# is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it |
||||||
|
# is not found. If ACTION-IF-FOUND is not specified, the default action |
||||||
|
# will define HAVE_PTHREAD. |
||||||
|
# |
||||||
|
# Please let the authors know if this macro fails on any platform, or if |
||||||
|
# you have any other suggestions or comments. This macro was based on work |
||||||
|
# by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help |
||||||
|
# from M. Frigo), as well as ac_pthread and hb_pthread macros posted by |
||||||
|
# Alejandro Forero Cuervo to the autoconf macro repository. We are also |
||||||
|
# grateful for the helpful feedback of numerous users. |
||||||
|
# |
||||||
|
# Updated for Autoconf 2.68 by Daniel Richard G. |
||||||
|
# |
||||||
|
# LICENSE |
||||||
|
# |
||||||
|
# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> |
||||||
|
# Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG> |
||||||
|
# |
||||||
|
# This program is free software: you can redistribute it and/or modify it |
||||||
|
# under the terms of the GNU General Public License as published by the |
||||||
|
# Free Software Foundation, either version 3 of the License, or (at your |
||||||
|
# option) any later version. |
||||||
|
# |
||||||
|
# This program is distributed in the hope that it will be useful, but |
||||||
|
# WITHOUT ANY WARRANTY; without even the implied warranty of |
||||||
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
||||||
|
# Public License for more details. |
||||||
|
# |
||||||
|
# You should have received a copy of the GNU General Public License along |
||||||
|
# with this program. If not, see <http://www.gnu.org/licenses/>. |
||||||
|
# |
||||||
|
# As a special exception, the respective Autoconf Macro's copyright owner |
||||||
|
# gives unlimited permission to copy, distribute and modify the configure |
||||||
|
# scripts that are the output of Autoconf when processing the Macro. You |
||||||
|
# need not follow the terms of the GNU General Public License when using |
||||||
|
# or distributing such scripts, even though portions of the text of the |
||||||
|
# Macro appear in them. The GNU General Public License (GPL) does govern |
||||||
|
# all other use of the material that constitutes the Autoconf Macro. |
||||||
|
# |
||||||
|
# This special exception to the GPL applies to versions of the Autoconf |
||||||
|
# Macro released by the Autoconf Archive. When you make and distribute a |
||||||
|
# modified version of the Autoconf Macro, you may extend this special |
||||||
|
# exception to the GPL to apply to your modified version as well. |
||||||
|
|
||||||
|
#serial 22 |
||||||
|
|
||||||
|
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) |
||||||
|
AC_DEFUN([AX_PTHREAD], [ |
||||||
|
AC_REQUIRE([AC_CANONICAL_HOST]) |
||||||
|
AC_REQUIRE([AC_PROG_CC]) |
||||||
|
AC_REQUIRE([AC_PROG_SED]) |
||||||
|
AC_LANG_PUSH([C]) |
||||||
|
ax_pthread_ok=no |
||||||
|
|
||||||
|
# We used to check for pthread.h first, but this fails if pthread.h |
||||||
|
# requires special compiler flags (e.g. on Tru64 or Sequent). |
||||||
|
# It gets checked for in the link test anyway. |
||||||
|
|
||||||
|
# First of all, check if the user has set any of the PTHREAD_LIBS, |
||||||
|
# etcetera environment variables, and if threads linking works using |
||||||
|
# them: |
||||||
|
if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then |
||||||
|
ax_pthread_save_CC="$CC" |
||||||
|
ax_pthread_save_CFLAGS="$CFLAGS" |
||||||
|
ax_pthread_save_LIBS="$LIBS" |
||||||
|
AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"]) |
||||||
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
||||||
|
LIBS="$PTHREAD_LIBS $LIBS" |
||||||
|
AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS]) |
||||||
|
AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes]) |
||||||
|
AC_MSG_RESULT([$ax_pthread_ok]) |
||||||
|
if test "x$ax_pthread_ok" = "xno"; then |
||||||
|
PTHREAD_LIBS="" |
||||||
|
PTHREAD_CFLAGS="" |
||||||
|
fi |
||||||
|
CC="$ax_pthread_save_CC" |
||||||
|
CFLAGS="$ax_pthread_save_CFLAGS" |
||||||
|
LIBS="$ax_pthread_save_LIBS" |
||||||
|
fi |
||||||
|
|
||||||
|
# We must check for the threads library under a number of different |
||||||
|
# names; the ordering is very important because some systems |
||||||
|
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
||||||
|
# libraries is broken (non-POSIX). |
||||||
|
|
||||||
|
# Create a list of thread flags to try. Items starting with a "-" are |
||||||
|
# C compiler flags, and other items are library names, except for "none" |
||||||
|
# which indicates that we try without any flags at all, and "pthread-config" |
||||||
|
# which is a program returning the flags for the Pth emulation library. |
||||||
|
|
||||||
|
ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
||||||
|
|
||||||
|
# The ordering *is* (sometimes) important. Some notes on the |
||||||
|
# individual items follow: |
||||||
|
|
||||||
|
# pthreads: AIX (must check this before -lpthread) |
||||||
|
# none: in case threads are in libc; should be tried before -Kthread and |
||||||
|
# other compiler flags to prevent continual compiler warnings |
||||||
|
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
||||||
|
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64 |
||||||
|
# (Note: HP C rejects this with "bad form for `-t' option") |
||||||
|
# -pthreads: Solaris/gcc (Note: HP C also rejects) |
||||||
|
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
||||||
|
# doesn't hurt to check since this sometimes defines pthreads and |
||||||
|
# -D_REENTRANT too), HP C (must be checked before -lpthread, which |
||||||
|
# is present but should not be used directly; and before -mthreads, |
||||||
|
# because the compiler interprets this as "-mt" + "-hreads") |
||||||
|
# -mthreads: Mingw32/gcc, Lynx/gcc |
||||||
|
# pthread: Linux, etcetera |
||||||
|
# --thread-safe: KAI C++ |
||||||
|
# pthread-config: use pthread-config program (for GNU Pth library) |
||||||
|
|
||||||
|
case $host_os in |
||||||
|
|
||||||
|
freebsd*) |
||||||
|
|
||||||
|
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
||||||
|
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
||||||
|
|
||||||
|
ax_pthread_flags="-kthread lthread $ax_pthread_flags" |
||||||
|
;; |
||||||
|
|
||||||
|
hpux*) |
||||||
|
|
||||||
|
# From the cc(1) man page: "[-mt] Sets various -D flags to enable |
||||||
|
# multi-threading and also sets -lpthread." |
||||||
|
|
||||||
|
ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags" |
||||||
|
;; |
||||||
|
|
||||||
|
openedition*) |
||||||
|
|
||||||
|
# IBM z/OS requires a feature-test macro to be defined in order to |
||||||
|
# enable POSIX threads at all, so give the user a hint if this is |
||||||
|
# not set. (We don't define these ourselves, as they can affect |
||||||
|
# other portions of the system API in unpredictable ways.) |
||||||
|
|
||||||
|
AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING], |
||||||
|
[ |
||||||
|
# if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS) |
||||||
|
AX_PTHREAD_ZOS_MISSING |
||||||
|
# endif |
||||||
|
], |
||||||
|
[AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])]) |
||||||
|
;; |
||||||
|
|
||||||
|
solaris*) |
||||||
|
|
||||||
|
# On Solaris (at least, for some versions), libc contains stubbed |
||||||
|
# (non-functional) versions of the pthreads routines, so link-based |
||||||
|
# tests will erroneously succeed. (N.B.: The stubs are missing |
||||||
|
# pthread_cleanup_push, or rather a function called by this macro, |
||||||
|
# so we could check for that, but who knows whether they'll stub |
||||||
|
# that too in a future libc.) So we'll check first for the |
||||||
|
# standard Solaris way of linking pthreads (-mt -lpthread). |
||||||
|
|
||||||
|
ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags" |
||||||
|
;; |
||||||
|
esac |
||||||
|
|
||||||
|
# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC) |
||||||
|
|
||||||
|
AS_IF([test "x$GCC" = "xyes"], |
||||||
|
[ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"]) |
||||||
|
|
||||||
|
# The presence of a feature test macro requesting re-entrant function |
||||||
|
# definitions is, on some systems, a strong hint that pthreads support is |
||||||
|
# correctly enabled |
||||||
|
|
||||||
|
case $host_os in |
||||||
|
darwin* | hpux* | linux* | osf* | solaris*) |
||||||
|
ax_pthread_check_macro="_REENTRANT" |
||||||
|
;; |
||||||
|
|
||||||
|
aix* | freebsd*) |
||||||
|
ax_pthread_check_macro="_THREAD_SAFE" |
||||||
|
;; |
||||||
|
|
||||||
|
*) |
||||||
|
ax_pthread_check_macro="--" |
||||||
|
;; |
||||||
|
esac |
||||||
|
AS_IF([test "x$ax_pthread_check_macro" = "x--"], |
||||||
|
[ax_pthread_check_cond=0], |
||||||
|
[ax_pthread_check_cond="!defined($ax_pthread_check_macro)"]) |
||||||
|
|
||||||
|
# Are we compiling with Clang? |
||||||
|
|
||||||
|
AC_CACHE_CHECK([whether $CC is Clang], |
||||||
|
[ax_cv_PTHREAD_CLANG], |
||||||
|
[ax_cv_PTHREAD_CLANG=no |
||||||
|
# Note that Autoconf sets GCC=yes for Clang as well as GCC |
||||||
|
if test "x$GCC" = "xyes"; then |
||||||
|
AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG], |
||||||
|
[/* Note: Clang 2.7 lacks __clang_[a-z]+__ */ |
||||||
|
# if defined(__clang__) && defined(__llvm__) |
||||||
|
AX_PTHREAD_CC_IS_CLANG |
||||||
|
# endif |
||||||
|
], |
||||||
|
[ax_cv_PTHREAD_CLANG=yes]) |
||||||
|
fi |
||||||
|
]) |
||||||
|
ax_pthread_clang="$ax_cv_PTHREAD_CLANG" |
||||||
|
|
||||||
|
ax_pthread_clang_warning=no |
||||||
|
|
||||||
|
# Clang needs special handling, because older versions handle the -pthread |
||||||
|
# option in a rather... idiosyncratic way |
||||||
|
|
||||||
|
if test "x$ax_pthread_clang" = "xyes"; then |
||||||
|
|
||||||
|
# Clang takes -pthread; it has never supported any other flag |
||||||
|
|
||||||
|
# (Note 1: This will need to be revisited if a system that Clang |
||||||
|
# supports has POSIX threads in a separate library. This tends not |
||||||
|
# to be the way of modern systems, but it's conceivable.) |
||||||
|
|
||||||
|
# (Note 2: On some systems, notably Darwin, -pthread is not needed |
||||||
|
# to get POSIX threads support; the API is always present and |
||||||
|
# active. We could reasonably leave PTHREAD_CFLAGS empty. But |
||||||
|
# -pthread does define _REENTRANT, and while the Darwin headers |
||||||
|
# ignore this macro, third-party headers might not.) |
||||||
|
|
||||||
|
PTHREAD_CFLAGS="-pthread" |
||||||
|
PTHREAD_LIBS= |
||||||
|
|
||||||
|
ax_pthread_ok=yes |
||||||
|
|
||||||
|
# However, older versions of Clang make a point of warning the user |
||||||
|
# that, in an invocation where only linking and no compilation is |
||||||
|
# taking place, the -pthread option has no effect ("argument unused |
||||||
|
# during compilation"). They expect -pthread to be passed in only |
||||||
|
# when source code is being compiled. |
||||||
|
# |
||||||
|
# Problem is, this is at odds with the way Automake and most other |
||||||
|
# C build frameworks function, which is that the same flags used in |
||||||
|
# compilation (CFLAGS) are also used in linking. Many systems |
||||||
|
# supported by AX_PTHREAD require exactly this for POSIX threads |
||||||
|
# support, and in fact it is often not straightforward to specify a |
||||||
|
# flag that is used only in the compilation phase and not in |
||||||
|
# linking. Such a scenario is extremely rare in practice. |
||||||
|
# |
||||||
|
# Even though use of the -pthread flag in linking would only print |
||||||
|
# a warning, this can be a nuisance for well-run software projects |
||||||
|
# that build with -Werror. So if the active version of Clang has |
||||||
|
# this misfeature, we search for an option to squash it. |
||||||
|
|
||||||
|
AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread], |
||||||
|
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG], |
||||||
|
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown |
||||||
|
# Create an alternate version of $ac_link that compiles and |
||||||
|
# links in two steps (.c -> .o, .o -> exe) instead of one |
||||||
|
# (.c -> exe), because the warning occurs only in the second |
||||||
|
# step |
||||||
|
ax_pthread_save_ac_link="$ac_link" |
||||||
|
ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g' |
||||||
|
ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"` |
||||||
|
ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)" |
||||||
|
ax_pthread_save_CFLAGS="$CFLAGS" |
||||||
|
for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do |
||||||
|
AS_IF([test "x$ax_pthread_try" = "xunknown"], [break]) |
||||||
|
CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS" |
||||||
|
ac_link="$ax_pthread_save_ac_link" |
||||||
|
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], |
||||||
|
[ac_link="$ax_pthread_2step_ac_link" |
||||||
|
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])], |
||||||
|
[break]) |
||||||
|
]) |
||||||
|
done |
||||||
|
ac_link="$ax_pthread_save_ac_link" |
||||||
|
CFLAGS="$ax_pthread_save_CFLAGS" |
||||||
|
AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no]) |
||||||
|
ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try" |
||||||
|
]) |
||||||
|
|
||||||
|
case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in |
||||||
|
no | unknown) ;; |
||||||
|
*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;; |
||||||
|
esac |
||||||
|
|
||||||
|
fi # $ax_pthread_clang = yes |
||||||
|
|
||||||
|
if test "x$ax_pthread_ok" = "xno"; then |
||||||
|
for ax_pthread_try_flag in $ax_pthread_flags; do |
||||||
|
|
||||||
|
case $ax_pthread_try_flag in |
||||||
|
none) |
||||||
|
AC_MSG_CHECKING([whether pthreads work without any flags]) |
||||||
|
;; |
||||||
|
|
||||||
|
-mt,pthread) |
||||||
|
AC_MSG_CHECKING([whether pthreads work with -mt -lpthread]) |
||||||
|
PTHREAD_CFLAGS="-mt" |
||||||
|
PTHREAD_LIBS="-lpthread" |
||||||
|
;; |
||||||
|
|
||||||
|
-*) |
||||||
|
AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag]) |
||||||
|
PTHREAD_CFLAGS="$ax_pthread_try_flag" |
||||||
|
;; |
||||||
|
|
||||||
|
pthread-config) |
||||||
|
AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) |
||||||
|
AS_IF([test "x$ax_pthread_config" = "xno"], [continue]) |
||||||
|
PTHREAD_CFLAGS="`pthread-config --cflags`" |
||||||
|
PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
||||||
|
;; |
||||||
|
|
||||||
|
*) |
||||||
|
AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag]) |
||||||
|
PTHREAD_LIBS="-l$ax_pthread_try_flag" |
||||||
|
;; |
||||||
|
esac |
||||||
|
|
||||||
|
ax_pthread_save_CFLAGS="$CFLAGS" |
||||||
|
ax_pthread_save_LIBS="$LIBS" |
||||||
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
||||||
|
LIBS="$PTHREAD_LIBS $LIBS" |
||||||
|
|
||||||
|
# Check for various functions. We must include pthread.h, |
||||||
|
# since some functions may be macros. (On the Sequent, we |
||||||
|
# need a special flag -Kthread to make this header compile.) |
||||||
|
# We check for pthread_join because it is in -lpthread on IRIX |
||||||
|
# while pthread_create is in libc. We check for pthread_attr_init |
||||||
|
# due to DEC craziness with -lpthreads. We check for |
||||||
|
# pthread_cleanup_push because it is one of the few pthread |
||||||
|
# functions on Solaris that doesn't have a non-functional libc stub. |
||||||
|
# We try pthread_create on general principles. |
||||||
|
|
||||||
|
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> |
||||||
|
# if $ax_pthread_check_cond |
||||||
|
# error "$ax_pthread_check_macro must be defined" |
||||||
|
# endif |
||||||
|
static void routine(void *a) { a = 0; } |
||||||
|
static void *start_routine(void *a) { return a; }], |
||||||
|
[pthread_t th; pthread_attr_t attr; |
||||||
|
pthread_create(&th, 0, start_routine, 0); |
||||||
|
pthread_join(th, 0); |
||||||
|
pthread_attr_init(&attr); |
||||||
|
pthread_cleanup_push(routine, 0); |
||||||
|
pthread_cleanup_pop(0) /* ; */])], |
||||||
|
[ax_pthread_ok=yes], |
||||||
|
[]) |
||||||
|
|
||||||
|
CFLAGS="$ax_pthread_save_CFLAGS" |
||||||
|
LIBS="$ax_pthread_save_LIBS" |
||||||
|
|
||||||
|
AC_MSG_RESULT([$ax_pthread_ok]) |
||||||
|
AS_IF([test "x$ax_pthread_ok" = "xyes"], [break]) |
||||||
|
|
||||||
|
PTHREAD_LIBS="" |
||||||
|
PTHREAD_CFLAGS="" |
||||||
|
done |
||||||
|
fi |
||||||
|
|
||||||
|
# Various other checks: |
||||||
|
if test "x$ax_pthread_ok" = "xyes"; then |
||||||
|
ax_pthread_save_CFLAGS="$CFLAGS" |
||||||
|
ax_pthread_save_LIBS="$LIBS" |
||||||
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
||||||
|
LIBS="$PTHREAD_LIBS $LIBS" |
||||||
|
|
||||||
|
# Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
||||||
|
AC_CACHE_CHECK([for joinable pthread attribute], |
||||||
|
[ax_cv_PTHREAD_JOINABLE_ATTR], |
||||||
|
[ax_cv_PTHREAD_JOINABLE_ATTR=unknown |
||||||
|
for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
||||||
|
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], |
||||||
|
[int attr = $ax_pthread_attr; return attr /* ; */])], |
||||||
|
[ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break], |
||||||
|
[]) |
||||||
|
done |
||||||
|
]) |
||||||
|
AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \ |
||||||
|
test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \ |
||||||
|
test "x$ax_pthread_joinable_attr_defined" != "xyes"], |
||||||
|
[AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], |
||||||
|
[$ax_cv_PTHREAD_JOINABLE_ATTR], |
||||||
|
[Define to necessary symbol if this constant |
||||||
|
uses a non-standard name on your system.]) |
||||||
|
ax_pthread_joinable_attr_defined=yes |
||||||
|
]) |
||||||
|
|
||||||
|
AC_CACHE_CHECK([whether more special flags are required for pthreads], |
||||||
|
[ax_cv_PTHREAD_SPECIAL_FLAGS], |
||||||
|
[ax_cv_PTHREAD_SPECIAL_FLAGS=no |
||||||
|
case $host_os in |
||||||
|
solaris*) |
||||||
|
ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS" |
||||||
|
;; |
||||||
|
esac |
||||||
|
]) |
||||||
|
AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \ |
||||||
|
test "x$ax_pthread_special_flags_added" != "xyes"], |
||||||
|
[PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS" |
||||||
|
ax_pthread_special_flags_added=yes]) |
||||||
|
|
||||||
|
AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], |
||||||
|
[ax_cv_PTHREAD_PRIO_INHERIT], |
||||||
|
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], |
||||||
|
[[int i = PTHREAD_PRIO_INHERIT;]])], |
||||||
|
[ax_cv_PTHREAD_PRIO_INHERIT=yes], |
||||||
|
[ax_cv_PTHREAD_PRIO_INHERIT=no]) |
||||||
|
]) |
||||||
|
AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \ |
||||||
|
test "x$ax_pthread_prio_inherit_defined" != "xyes"], |
||||||
|
[AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.]) |
||||||
|
ax_pthread_prio_inherit_defined=yes |
||||||
|
]) |
||||||
|
|
||||||
|
CFLAGS="$ax_pthread_save_CFLAGS" |
||||||
|
LIBS="$ax_pthread_save_LIBS" |
||||||
|
|
||||||
|
# More AIX lossage: compile with *_r variant |
||||||
|
if test "x$GCC" != "xyes"; then |
||||||
|
case $host_os in |
||||||
|
aix*) |
||||||
|
AS_CASE(["x/$CC"], |
||||||
|
[x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], |
||||||
|
[#handle absolute path differently from PATH based program lookup |
||||||
|
AS_CASE(["x$CC"], |
||||||
|
[x/*], |
||||||
|
[AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], |
||||||
|
[AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) |
||||||
|
;; |
||||||
|
esac |
||||||
|
fi |
||||||
|
fi |
||||||
|
|
||||||
|
test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" |
||||||
|
|
||||||
|
AC_SUBST([PTHREAD_LIBS]) |
||||||
|
AC_SUBST([PTHREAD_CFLAGS]) |
||||||
|
AC_SUBST([PTHREAD_CC]) |
||||||
|
|
||||||
|
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
||||||
|
if test "x$ax_pthread_ok" = "xyes"; then |
||||||
|
ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1]) |
||||||
|
: |
||||||
|
else |
||||||
|
ax_pthread_ok=no |
||||||
|
$2 |
||||||
|
fi |
||||||
|
AC_LANG_POP |
||||||
|
])dnl AX_PTHREAD |
||||||
Loading…
Reference in new issue