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Add new auto-detection of thread flags.
Allow additional thread flags to be added via port templates. Change thread flag names to PTHREAD_CFLAGS and PTHREAD_LIBS to match new configure script.
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dnl Available from the GNU Autoconf Macro Archive at: | ||
dnl http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html | ||
dnl | ||
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="$save_CFLAGS" | ||
fi | ||
# We must check for the threads library under a number of different | ||
# names; the ordering is very important because some systems | ||
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the | ||
# libraries is broken (non-POSIX). | ||
# Create a list of thread flags to try. Items starting with a "-" are | ||
# C compiler flags, and other items are library names, except for "none" | ||
# which indicates that we try without any flags at all, and "pthread-config" | ||
# which is a program returning the flags for the Pth emulation library. | ||
acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" | ||
# The ordering *is* (sometimes) important. Some notes on the | ||
# individual items follow: | ||
# pthreads: AIX (must check this before -lpthread) | ||
# none: in case threads are in libc; should be tried before -Kthread and | ||
# other compiler flags to prevent continual compiler warnings | ||
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) | ||
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) | ||
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) | ||
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) | ||
# -pthreads: Solaris/gcc | ||
# -mthreads: Mingw32/gcc, Lynx/gcc | ||
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it | ||
# doesn't hurt to check since this sometimes defines pthreads too; | ||
# also defines -D_REENTRANT) | ||
# pthread: Linux, etcetera | ||
# --thread-safe: KAI C++ | ||
# pthread-config: use pthread-config program (for GNU Pth library) | ||
case "${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 -pthread or | ||
# -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="-pthread -pthreads pthread -mt $acx_pthread_flags" | ||
;; | ||
esac | ||
if test x"$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 $PTHREAD_CFLAGS" | ||
# Detect AIX lossage: threads are created detached by default | ||
# and the JOINABLE attribute has a nonstandard name (UNDETACHED). | ||
AC_MSG_CHECKING([for joinable pthread attribute]) | ||
AC_TRY_LINK([#include <pthread.h>], | ||
[int attr=PTHREAD_CREATE_JOINABLE;], | ||
ok=PTHREAD_CREATE_JOINABLE, ok=unknown) | ||
if test x"$ok" = xunknown; then | ||
AC_TRY_LINK([#include <pthread.h>], | ||
[int attr=PTHREAD_CREATE_UNDETACHED;], | ||
ok=PTHREAD_CREATE_UNDETACHED, ok=unknown) | ||
fi | ||
if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then | ||
AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok, | ||
[Define to the necessary symbol if this constant | ||
uses a non-standard name on your system.]) | ||
fi | ||
AC_MSG_RESULT(${ok}) | ||
if test x"$ok" = xunknown; then | ||
AC_MSG_WARN([we do not know how to create joinable pthreads]) | ||
fi | ||
AC_MSG_CHECKING([if more special flags are required for pthreads]) | ||
flag=no | ||
case "${host_cpu}-${host_os}" in | ||
*-aix* | *-freebsd*) flag="-D_THREAD_SAFE";; | ||
*solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; | ||
esac | ||
AC_MSG_RESULT(${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 cc_r | ||
AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC}) | ||
else | ||
PTHREAD_CC="$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 |
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