From a40b2132fb6dbd76b179272aa3e9706c4dfe4e85 Mon Sep 17 00:00:00 2001 From: Jari Sundell Date: Mon, 28 Nov 2011 18:27:24 +0900 Subject: [PATCH] Added autoconf scripts for pthread. --- configure.ac | 4 + scripts/acx_pthread.m4 | 227 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 231 insertions(+) create mode 100644 scripts/acx_pthread.m4 diff --git a/configure.ac b/configure.ac index 5bac9e06..f8d4cbe9 100644 --- a/configure.ac +++ b/configure.ac @@ -27,6 +27,10 @@ TORRENT_WITHOUT_NCURSESW() TORRENT_WITHOUT_STATVFS() TORRENT_WITHOUT_STATFS() +ACX_PTHREAD(CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"; + LIBS="$PTHREAD_LIBS $LIBS" +) + PKG_CHECK_MODULES(sigc, sigc++-2.0, CXXFLAGS="$CXXFLAGS $sigc_CFLAGS"; LIBS="$LIBS $sigc_LIBS") diff --git a/scripts/acx_pthread.m4 b/scripts/acx_pthread.m4 new file mode 100644 index 00000000..ceb161a5 --- /dev/null +++ b/scripts/acx_pthread.m4 @@ -0,0 +1,227 @@ +dnl PGSGL: When updating, comment out port-specific part below; +dnl see the comment below with the word "PostgreSQL". +dnl +dnl Available from the GNU Autoconf Macro Archive at: +dnl http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html +dnl +AC_DEFUN([ACX_PTHREAD], [ +AC_REQUIRE([AC_CANONICAL_HOST]) +AC_LANG_SAVE +AC_LANG_C +acx_pthread_ok=no + +# We used to check for pthread.h first, but this fails if pthread.h +# requires special compiler flags (e.g. on True64 or Sequent). +# It gets checked for in the link test anyway. + +# First of all, check if the user has set any of the PTHREAD_LIBS, +# etcetera environment variables, and if threads linking works using +# them: +if test x"$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 $tryPTHREAD_CFLAGS" + + # Check for various functions. We must include pthread.h, + # since some functions may be macros. (On the Sequent, we + # need a special flag -Kthread to make this header compile.) + # We check for pthread_join because it is in -lpthread on IRIX + # while pthread_create is in libc. We check for pthread_attr_init + # due to DEC craziness with -lpthreads. We check for + # pthread_cleanup_push because it is one of the few pthread + # functions on Solaris that doesn't have a non-functional libc stub. + # We try pthread_create on general principles. + AC_TRY_LINK([#include ], + [pthread_t th; pthread_join(th, 0); + pthread_attr_init(0); pthread_cleanup_push(0, 0); + pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], + [acx_pthread_ok=yes], [acx_pthread_ok=no]) + + if test "x$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 + if test "`(eval $ac_link 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 $PTHREAD_CFLAGS" + + # Detect AIX lossage: threads are created detached by default + # and the JOINABLE attribute has a nonstandard name (UNDETACHED). + AC_MSG_CHECKING([for joinable pthread attribute]) + AC_TRY_LINK([#include ], + [int attr=PTHREAD_CREATE_JOINABLE;], + ok=PTHREAD_CREATE_JOINABLE, ok=unknown) + if test x"$ok" = xunknown; then + AC_TRY_LINK([#include ], + [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