mirror of
https://github.com/postgres/postgres.git
synced 2025-11-03 09:13:20 +03:00
f005384532
When testing the stderr produced by various thread-support flags, also run a compilation in addition to a link, because clang warns on certain flags when compiling but not when linking.
229 lines
9.0 KiB
Plaintext
229 lines
9.0 KiB
Plaintext
dnl PGSGL: When updating, comment out port-specific part below;
|
|
dnl see the comment below with the word "PostgreSQL".
|
|
dnl
|
|
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="$save_CFLAGS"
|
|
fi
|
|
|
|
# We must check for the threads library under a number of different
|
|
# names; the ordering is very important because some systems
|
|
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
|
|
# libraries is broken (non-POSIX).
|
|
|
|
# Create a list of thread flags to try. Items starting with a "-" are
|
|
# C compiler flags, and other items are library names, except for "none"
|
|
# which indicates that we try without any flags at all, and "pthread-config"
|
|
# which is a program returning the flags for the Pth emulation library.
|
|
|
|
acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config pthreadGC2"
|
|
|
|
# The ordering *is* (sometimes) important. Some notes on the
|
|
# individual items follow:
|
|
|
|
# pthreads: AIX (must check this before -lpthread)
|
|
# none: in case threads are in libc; should be tried before -Kthread and
|
|
# other compiler flags to prevent continual compiler warnings
|
|
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
|
|
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
|
|
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
|
|
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
|
|
# -pthreads: Solaris/gcc
|
|
# -mthreads: Mingw32/gcc, Lynx/gcc
|
|
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
|
|
# doesn't hurt to check since this sometimes defines pthreads too;
|
|
# also defines -D_REENTRANT)
|
|
# pthread: Linux, etcetera
|
|
# --thread-safe: KAI C++
|
|
# pthread-config: use pthread-config program (for GNU Pth library)
|
|
|
|
case "${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
|
|
|
|
tryPTHREAD_CFLAGS=""
|
|
tryPTHREAD_LIBS=""
|
|
case $flag in
|
|
none)
|
|
AC_MSG_CHECKING([whether pthreads work without any flags])
|
|
;;
|
|
|
|
-*)
|
|
AC_MSG_CHECKING([whether pthreads work with $flag])
|
|
tryPTHREAD_CFLAGS="$flag"
|
|
;;
|
|
|
|
pthread-config)
|
|
# skip this if we already have flags defined, for PostgreSQL
|
|
if test x"$PTHREAD_CFLAGS" != x -o x"$PTHREAD_LIBS" != x; then continue; fi
|
|
AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
|
|
if test x"$acx_pthread_config" = xno; then continue; fi
|
|
tryPTHREAD_CFLAGS="`pthread-config --cflags`"
|
|
tryPTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
|
|
;;
|
|
|
|
*)
|
|
AC_MSG_CHECKING([for the pthreads library -l$flag])
|
|
tryPTHREAD_LIBS="-l$flag"
|
|
;;
|
|
esac
|
|
|
|
save_LIBS="$LIBS"
|
|
save_CFLAGS="$CFLAGS"
|
|
LIBS="$tryPTHREAD_LIBS $PTHREAD_LIBS $LIBS"
|
|
CFLAGS="$CFLAGS $PTHREAD_CFLAGS $tryPTHREAD_CFLAGS"
|
|
|
|
# Check for various functions. We must include pthread.h,
|
|
# since some functions may be macros. (On the Sequent, we
|
|
# need a special flag -Kthread to make this header compile.)
|
|
# We check for pthread_join because it is in -lpthread on IRIX
|
|
# while pthread_create is in libc. We check for pthread_attr_init
|
|
# due to DEC craziness with -lpthreads. We check for
|
|
# pthread_cleanup_push because it is one of the few pthread
|
|
# functions on Solaris that doesn't have a non-functional libc stub.
|
|
# We try pthread_create on general principles.
|
|
AC_TRY_LINK([#include <pthread.h>],
|
|
[pthread_t th; pthread_join(th, 0);
|
|
pthread_attr_init(0); pthread_cleanup_push(0, 0);
|
|
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
|
|
[acx_pthread_ok=yes], [acx_pthread_ok=no])
|
|
|
|
if test "x$acx_pthread_ok" = xyes; then
|
|
# Don't use options that are ignored by the compiler.
|
|
# We find them by checking stderror.
|
|
cat >conftest.$ac_ext <<_ACEOF
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
(void) argc;
|
|
(void) argv;
|
|
return 0;
|
|
}
|
|
_ACEOF
|
|
rm -f conftest.$ac_objext conftest$ac_exeext
|
|
# Check both linking and compiling, because they might tolerate different options.
|
|
if test "`(eval $ac_link 2>&1 1>&5)`" = "" && test "`(eval $ac_compile 2>&1 1>&5)`" = ""; then
|
|
# we continue with more flags because Linux needs -lpthread
|
|
# for libpq builds on PostgreSQL. The test above only
|
|
# tests for building binaries, not shared libraries.
|
|
PTHREAD_LIBS=" $tryPTHREAD_LIBS $PTHREAD_LIBS"
|
|
PTHREAD_CFLAGS="$PTHREAD_CFLAGS $tryPTHREAD_CFLAGS"
|
|
else acx_pthread_ok=no
|
|
fi
|
|
fi
|
|
|
|
LIBS="$save_LIBS"
|
|
CFLAGS="$save_CFLAGS"
|
|
|
|
AC_MSG_RESULT($acx_pthread_ok)
|
|
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"$ok" = xunknown; then
|
|
AC_MSG_WARN([we do not know how to create joinable pthreads])
|
|
fi
|
|
|
|
AC_MSG_CHECKING([if more special flags are required for pthreads])
|
|
flag=no
|
|
# We always add these in PostgreSQL
|
|
# case "${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"
|
|
|
|
# Supporting cc_r would require a special CC in all places that
|
|
# use libpq, and that is ugly, so we don't do it. Users can still
|
|
# define their compiler as cc_r to do thread builds of everything.
|
|
# 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
|