mirror of
https://github.com/ceph/ceph
synced 2024-12-15 16:07:00 +00:00
7bf01b1161
See http://code.google.com/p/protobuf/issues/detail?id=188 for details Signed-off-by: Kacper Kowalik (Xarthisius) <xarthisius@gentoo.org>
398 lines
14 KiB
Plaintext
398 lines
14 KiB
Plaintext
# This was retrieved from
|
|
# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi
|
|
# See also (perhaps for new versions?)
|
|
# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi
|
|
#
|
|
# We've rewritten the inconsistency check code (from avahi), to work
|
|
# more broadly. In particular, it no longer assumes ld accepts -zdefs.
|
|
# This caused a restructing of the code, but the functionality has only
|
|
# changed a little.
|
|
|
|
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
|
|
|
|
# We used to check for pthread.h first, but this fails if pthread.h
|
|
# requires special compiler flags (e.g. on True64 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"$PTHREAD_LIBS$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="$save_CFLAGS"
|
|
fi
|
|
|
|
# We must check for the threads library under a number of different
|
|
# names; the ordering is very important because some systems
|
|
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
|
|
# libraries is broken (non-POSIX).
|
|
|
|
# Create a list of thread flags to try. Items starting with a "-" are
|
|
# C compiler flags, and other items are library names, except for "none"
|
|
# which indicates that we try without any flags at all, and "pthread-config"
|
|
# which is a program returning the flags for the Pth emulation library.
|
|
|
|
acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
|
|
|
|
# The ordering *is* (sometimes) important. Some notes on the
|
|
# individual items follow:
|
|
|
|
# pthreads: AIX (must check this before -lpthread)
|
|
# none: in case threads are in libc; should be tried before -Kthread and
|
|
# other compiler flags to prevent continual compiler warnings
|
|
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
|
|
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
|
|
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
|
|
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
|
|
# -pthreads: Solaris/gcc
|
|
# -mthreads: Mingw32/gcc, Lynx/gcc
|
|
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
|
|
# doesn't hurt to check since this sometimes defines pthreads too;
|
|
# also defines -D_REENTRANT)
|
|
# ... -mt is also the pthreads flag for HP/aCC
|
|
# pthread: Linux, etcetera
|
|
# --thread-safe: KAI C++
|
|
# pthread-config: use pthread-config program (for GNU Pth library)
|
|
|
|
case "${host_cpu}-${host_os}" in
|
|
*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. (We need to link with -pthreads/-mt/
|
|
# -lpthread.) (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 just look for -pthreads and -lpthread first:
|
|
|
|
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 $PTHREAD_CFLAGS"
|
|
|
|
# Check for various functions. We must include pthread.h,
|
|
# since some functions may be macros. (On the Sequent, we
|
|
# need a special flag -Kthread to make this header compile.)
|
|
# We check for pthread_join because it is in -lpthread on IRIX
|
|
# while pthread_create is in libc. We check for pthread_attr_init
|
|
# due to DEC craziness with -lpthreads. We check for
|
|
# pthread_cleanup_push because it is one of the few pthread
|
|
# functions on Solaris that doesn't have a non-functional libc stub.
|
|
# We try pthread_create on general principles.
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[pthread_t th; pthread_join(th, 0);
|
|
pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|
[acx_pthread_ok=yes])
|
|
|
|
LIBS="$save_LIBS"
|
|
CFLAGS="$save_CFLAGS"
|
|
|
|
AC_MSG_RESULT($acx_pthread_ok)
|
|
if test "x$acx_pthread_ok" = xyes; then
|
|
break;
|
|
fi
|
|
|
|
PTHREAD_LIBS=""
|
|
PTHREAD_CFLAGS=""
|
|
done
|
|
fi
|
|
|
|
# Various other checks:
|
|
if test "x$acx_pthread_ok" = xyes; then
|
|
save_LIBS="$LIBS"
|
|
LIBS="$PTHREAD_LIBS $LIBS"
|
|
save_CFLAGS="$CFLAGS"
|
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
|
|
|
|
# Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
|
|
AC_MSG_CHECKING([for joinable pthread attribute])
|
|
attr_name=unknown
|
|
for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
|
|
AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
|
|
[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="$save_CFLAGS"
|
|
# More AIX lossage: must compile with xlc_r or cc_r
|
|
if test x"$GCC" != xyes; then
|
|
AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
|
|
else
|
|
PTHREAD_CC=$CC
|
|
fi
|
|
|
|
# The next part tries to detect GCC inconsistency with -shared on some
|
|
# architectures and systems. The problem is that in certain
|
|
# configurations, when -shared is specified, GCC "forgets" to
|
|
# internally use various flags which are still necessary.
|
|
|
|
#
|
|
# Prepare the flags
|
|
#
|
|
save_CFLAGS="$CFLAGS"
|
|
save_LIBS="$LIBS"
|
|
save_CC="$CC"
|
|
|
|
# Try with the flags determined by the earlier checks.
|
|
#
|
|
# -Wl,-z,defs forces link-time symbol resolution, so that the
|
|
# linking checks with -shared actually have any value
|
|
#
|
|
# FIXME: -fPIC is required for -shared on many architectures,
|
|
# so we specify it here, but the right way would probably be to
|
|
# properly detect whether it is actually required.
|
|
CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
|
|
LIBS="$PTHREAD_LIBS $LIBS"
|
|
CC="$PTHREAD_CC"
|
|
|
|
# In order not to create several levels of indentation, we test
|
|
# the value of "$done" until we find the cure or run out of ideas.
|
|
done="no"
|
|
|
|
# First, make sure the CFLAGS we added are actually accepted by our
|
|
# compiler. If not (and OS X's ld, for instance, does not accept -z),
|
|
# then we can't do this test.
|
|
if test x"$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([#include <pthread.h>],
|
|
[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$done" = xyes; then
|
|
AC_MSG_RESULT([yes])
|
|
else
|
|
AC_MSG_RESULT([no])
|
|
fi
|
|
fi
|
|
|
|
#
|
|
# Linux gcc on some architectures such as mips/mipsel forgets
|
|
# about -lpthread
|
|
#
|
|
if test x"$done" = xno; then
|
|
AC_MSG_CHECKING([whether -lpthread fixes that])
|
|
LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[pthread_t th; pthread_join(th, 0);
|
|
pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|
[done=yes])
|
|
|
|
if test "x$done" = xyes; then
|
|
AC_MSG_RESULT([yes])
|
|
PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
|
|
else
|
|
AC_MSG_RESULT([no])
|
|
fi
|
|
fi
|
|
#
|
|
# FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
|
|
#
|
|
if test x"$done" = xno; then
|
|
AC_MSG_CHECKING([whether -lc_r fixes that])
|
|
LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[pthread_t th; pthread_join(th, 0);
|
|
pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|
[done=yes])
|
|
|
|
if test "x$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
|
|
# OK, we have run out of ideas
|
|
AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
|
|
|
|
# so it's not safe to assume that we may use pthreads
|
|
acx_pthread_ok=no
|
|
fi
|
|
|
|
AC_MSG_CHECKING([whether what we have so far is sufficient with -nostdlib])
|
|
CFLAGS="-nostdlib $CFLAGS"
|
|
# we need c with nostdlib
|
|
LIBS="$LIBS -lc"
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[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],[done=no])
|
|
|
|
if test "x$done" = xyes; then
|
|
AC_MSG_RESULT([yes])
|
|
else
|
|
AC_MSG_RESULT([no])
|
|
fi
|
|
|
|
if test x"$done" = xno; then
|
|
AC_MSG_CHECKING([whether -lpthread saves the day])
|
|
LIBS="-lpthread $LIBS"
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[pthread_t th; pthread_join(th, 0);
|
|
pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|
[done=yes],[done=no])
|
|
|
|
if test "x$done" = xyes; then
|
|
AC_MSG_RESULT([yes])
|
|
PTHREAD_LIBS="$PTHREAD_LIBS -lpthread"
|
|
else
|
|
AC_MSG_RESULT([no])
|
|
AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries and -nostdlib])
|
|
fi
|
|
fi
|
|
|
|
CFLAGS="$save_CFLAGS"
|
|
LIBS="$save_LIBS"
|
|
CC="$save_CC"
|
|
else
|
|
PTHREAD_CC="$CC"
|
|
fi
|
|
|
|
AC_SUBST(PTHREAD_LIBS)
|
|
AC_SUBST(PTHREAD_CFLAGS)
|
|
AC_SUBST(PTHREAD_CC)
|
|
|
|
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
|
|
if test x"$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
|