From 2ca4dab349cc3f91032b17ced6b76023b4e67115 Mon Sep 17 00:00:00 2001 From: "Jay Freeman (saurik)" Date: Thu, 5 Nov 2015 01:43:38 -0800 Subject: [PATCH 1/1] Avoid error caused by passing -pthread to libtool. --- Makefile.in | 8 +- configure | 196 +++++++++++++++++-------- m4/ax_pthread.m4 | 374 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 511 insertions(+), 67 deletions(-) create mode 100644 m4/ax_pthread.m4 diff --git a/Makefile.in b/Makefile.in index 5d81b34..dc06265 100644 --- a/Makefile.in +++ b/Makefile.in @@ -123,10 +123,10 @@ DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \ ltmain.sh ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_compile_stdcxx_11.m4 \ - $(top_srcdir)/m4/framework.m4 $(top_srcdir)/m4/libtool.m4 \ - $(top_srcdir)/m4/ltoptions.m4 $(top_srcdir)/m4/ltsugar.m4 \ - $(top_srcdir)/m4/ltversion.m4 $(top_srcdir)/m4/lt~obsolete.m4 \ - $(top_srcdir)/configure.ac + $(top_srcdir)/m4/ax_pthread.m4 $(top_srcdir)/m4/framework.m4 \ + $(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \ + $(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \ + $(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/configure.ac am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ $(ACLOCAL_M4) am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \ diff --git a/configure b/configure index 07b7889..1973916 100755 --- a/configure +++ b/configure @@ -19008,6 +19008,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu + ac_ext=c ac_cpp='$CPP $CPPFLAGS' ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' @@ -19017,7 +19018,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu ax_pthread_ok=no # We used to check for pthread.h first, but this fails if pthread.h -# requires special compiler flags (e.g. on True64 or Sequent). +# requires special compiler flags (e.g. on Tru64 or Sequent). # It gets checked for in the link test anyway. # First of all, check if the user has set any of the PTHREAD_LIBS, @@ -19028,8 +19029,8 @@ if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then CFLAGS="$CFLAGS $PTHREAD_CFLAGS" save_LIBS="$LIBS" LIBS="$PTHREAD_LIBS $LIBS" - { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS" >&5 -$as_echo_n "checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS... " >&6; } + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS" >&5 +$as_echo_n "checking for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS... " >&6; } cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ @@ -19073,7 +19074,7 @@ fi # 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 -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" +ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt -mthreads pthread --thread-safe pthread-config" # The ordering *is* (sometimes) important. Some notes on the # individual items follow: @@ -19084,46 +19085,80 @@ ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt # -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) +# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64 # -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 +# 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) +# -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 +case $host_os in + + 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 $ax_pthread_flags" + ;; + + openedition*) + + # IBM z/OS requires a feature-test macro to be defined in order to + # enable POSIX threads at all, so give the user a hint if this is + # not set. (We don't define these ourselves, as they can affect + # other portions of the system API in unpredictable ways.) + + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + +# if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS) + AX_PTHREAD_ZOS_MISSING +# endif + +_ACEOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + $EGREP "AX_PTHREAD_ZOS_MISSING" >/dev/null 2>&1; then : + { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support." >&5 +$as_echo "$as_me: WARNING: IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support." >&2;} +fi +rm -f conftest* + + ;; + solaris*) - # On Solaris (at least, for some versions), libc contains stubbed + # Newer versions of Solaris require the "-mt -lpthread" pair, and we + # check that first. On some older 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: - - ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags" - ;; + # who knows whether they'll stub that too in a future libc.) So + # we'll look for -pthreads and -lpthread shortly thereafter. - darwin*) - ax_pthread_flags="-pthread $ax_pthread_flags" + ax_pthread_flags="-mt,pthread -pthreads -pthread pthread $ax_pthread_flags" ;; esac -# Clang doesn't consider unrecognized options an error unless we specify -# -Werror. We throw in some extra Clang-specific options to ensure that -# this doesn't happen for GCC, which also accepts -Werror. +# Older versions of Clang only give a warning instead of an error for an +# unrecognized option, unless we specify -Werror. (We throw in some extra +# Clang warning flags for good measure.) -{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler needs -Werror to reject unknown flags" >&5 -$as_echo_n "checking if compiler needs -Werror to reject unknown flags... " >&6; } -save_CFLAGS="$CFLAGS" -ax_pthread_extra_flags="-Werror" -CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument" -cat confdefs.h - <<_ACEOF >conftest.$ac_ext +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler needs certain flags to reject unknown flags" >&5 +$as_echo_n "checking if compiler needs certain flags to reject unknown flags... " >&6; } +if ${ax_cv_PTHREAD_REJECT_UNKNOWN+:} false; then : + $as_echo_n "(cached) " >&6 +else + ax_cv_PTHREAD_REJECT_UNKNOWN=unknown + save_CFLAGS="$CFLAGS" + ax_pthread_extra_flags="-Wunknown-warning-option -Wunused-command-line-argument" + CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wfoobaz -foobaz" + cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ int foo(void); int @@ -19135,15 +19170,20 @@ foo() } _ACEOF if ac_fn_c_try_compile "$LINENO"; then : - { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5 -$as_echo "yes" >&6; } + ax_cv_PTHREAD_REJECT_UNKNOWN="-Werror $ax_pthread_extra_flags" else - ax_pthread_extra_flags= - { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5 -$as_echo "no" >&6; } + ax_cv_PTHREAD_REJECT_UNKNOWN=no fi rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext -CFLAGS="$save_CFLAGS" + CFLAGS="$save_CFLAGS" + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_PTHREAD_REJECT_UNKNOWN" >&5 +$as_echo "$ax_cv_PTHREAD_REJECT_UNKNOWN" >&6; } +ax_pthread_extra_flags= +if test "x$ax_cv_PTHREAD_REJECT_UNKNOWN" != "xno"; then : + ax_pthread_extra_flags="$ax_cv_PTHREAD_REJECT_UNKNOWN" +fi if test x"$ax_pthread_ok" = xno; then for flag in $ax_pthread_flags; do @@ -19154,6 +19194,13 @@ for flag in $ax_pthread_flags; do $as_echo_n "checking whether pthreads work without any flags... " >&6; } ;; + -mt,pthread) + { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthreads work with -mt -lpthread" >&5 +$as_echo_n "checking whether pthreads work with -mt -lpthread... " >&6; } + PTHREAD_CFLAGS="-mt" + PTHREAD_LIBS="-lpthread" + ;; + -*) { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthreads work with $flag" >&5 $as_echo_n "checking whether pthreads work with $flag... " >&6; } @@ -19273,9 +19320,12 @@ if test "x$ax_pthread_ok" = xyes; then # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. { $as_echo "$as_me:${as_lineno-$LINENO}: checking for joinable pthread attribute" >&5 $as_echo_n "checking for joinable pthread attribute... " >&6; } - attr_name=unknown - for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do - cat confdefs.h - <<_ACEOF >conftest.$ac_ext +if ${ax_cv_PTHREAD_JOINABLE_ATTR+:} false; then : + $as_echo_n "(cached) " >&6 +else + ax_cv_PTHREAD_JOINABLE_ATTR=unknown + for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do + cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ #include int @@ -19287,49 +19337,69 @@ int attr = $attr; return attr /* ; */ } _ACEOF if ac_fn_c_try_link "$LINENO"; then : - attr_name=$attr; break + ax_cv_PTHREAD_JOINABLE_ATTR=$attr; break fi rm -f core conftest.err conftest.$ac_objext \ conftest$ac_exeext conftest.$ac_ext - done - { $as_echo "$as_me:${as_lineno-$LINENO}: result: $attr_name" >&5 -$as_echo "$attr_name" >&6; } - if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then + done + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_PTHREAD_JOINABLE_ATTR" >&5 +$as_echo "$ax_cv_PTHREAD_JOINABLE_ATTR" >&6; } + if test "$ax_cv_PTHREAD_JOINABLE_ATTR" != unknown && \ + test "$ax_cv_PTHREAD_JOINABLE_ATTR" != PTHREAD_CREATE_JOINABLE; then : cat >>confdefs.h <<_ACEOF -#define PTHREAD_CREATE_JOINABLE $attr_name +#define PTHREAD_CREATE_JOINABLE $ax_cv_PTHREAD_JOINABLE_ATTR _ACEOF - fi +fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking if more special flags are required for pthreads" >&5 $as_echo_n "checking if more special flags are required for pthreads... " >&6; } - flag=no - case ${host_os} in - aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";; - osf* | hpux*) flag="-D_REENTRANT";; - solaris*) - if test "$GCC" = "yes"; then - flag="-D_REENTRANT" - else - # TODO: What about Clang on Solaris? - flag="-mt -D_REENTRANT" - fi - ;; - esac - { $as_echo "$as_me:${as_lineno-$LINENO}: result: $flag" >&5 -$as_echo "$flag" >&6; } - if test "x$flag" != xno; then - PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" - fi +if ${ax_cv_PTHREAD_SPECIAL_FLAGS+:} false; then : + $as_echo_n "(cached) " >&6 +else + ax_cv_PTHREAD_SPECIAL_FLAGS=no + ax_pthread_special_flags_added=no + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + +# if !defined(_REENTRANT) && !defined(_THREAD_SAFE) + AX_PTHREAD_NEED_SPECIAL_FLAG +# endif + +_ACEOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + $EGREP "AX_PTHREAD_NEED_SPECIAL_FLAG" >/dev/null 2>&1; then : + case $host_os in + aix* | freebsd*) + ax_cv_PTHREAD_SPECIAL_FLAGS="-D_THREAD_SAFE" + ;; + darwin* | hpux* | osf* | solaris*) + ax_cv_PTHREAD_SPECIAL_FLAGS="-D_REENTRANT" + ;; + esac + +fi +rm -f conftest* + + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_PTHREAD_SPECIAL_FLAGS" >&5 +$as_echo "$ax_cv_PTHREAD_SPECIAL_FLAGS" >&6; } + if test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \ + test "x$ax_pthread_special_flags_added" != "xyes"; then : + PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS" + ax_pthread_special_flags_added=yes +fi { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PTHREAD_PRIO_INHERIT" >&5 $as_echo_n "checking for PTHREAD_PRIO_INHERIT... " >&6; } if ${ax_cv_PTHREAD_PRIO_INHERIT+:} false; then : $as_echo_n "(cached) " >&6 else - - cat confdefs.h - <<_ACEOF >conftest.$ac_ext + cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ #include int diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4 new file mode 100644 index 0000000..f6445a6 --- /dev/null +++ b/m4/ax_pthread.m4 @@ -0,0 +1,374 @@ +# =========================================================================== +# 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 link it with them as well. e.g. you should link with +# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS +# +# If you are only building threads programs, you may wish to use these +# variables in your default LIBS, CFLAGS, and CC: +# +# LIBS="$PTHREAD_LIBS $LIBS" +# CFLAGS="$CFLAGS $PTHREAD_CFLAGS" +# CC="$PTHREAD_CC" +# +# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant +# has a nonstandard name, 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 +# Copyright (c) 2011 Daniel Richard G. +# +# 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 . +# +# 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 21 + +AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) +AC_DEFUN([AX_PTHREAD], [ +AC_REQUIRE([AC_CANONICAL_HOST]) +AC_REQUIRE([AC_PROG_CC]) +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"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $PTHREAD_CFLAGS" + save_LIBS="$LIBS" + LIBS="$PTHREAD_LIBS $LIBS" + AC_MSG_CHECKING([for pthread_join 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"$ax_pthread_ok" = xno; then + PTHREAD_LIBS="" + PTHREAD_CFLAGS="" + fi + LIBS="$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. + +ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt -mthreads pthread --thread-safe 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), Tru64 +# -pthreads: Solaris/gcc +# -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) +# -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 + + 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*) + + # Newer versions of Solaris require the "-mt -lpthread" pair, and we + # check that first. On some older 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 look for -pthreads and -lpthread shortly thereafter. + + ax_pthread_flags="-mt,pthread -pthreads -pthread pthread $ax_pthread_flags" + ;; +esac + +# Older versions of Clang only give a warning instead of an error for an +# unrecognized option, unless we specify -Werror. (We throw in some extra +# Clang warning flags for good measure.) + +AC_CACHE_CHECK([if compiler needs certain flags to reject unknown flags], + [ax_cv_PTHREAD_REJECT_UNKNOWN], + [ax_cv_PTHREAD_REJECT_UNKNOWN=unknown + save_CFLAGS="$CFLAGS" + ax_pthread_extra_flags="-Wunknown-warning-option -Wunused-command-line-argument" + CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wfoobaz -foobaz" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])], + [ax_cv_PTHREAD_REJECT_UNKNOWN="-Werror $ax_pthread_extra_flags"], + [ax_cv_PTHREAD_REJECT_UNKNOWN=no]) + CFLAGS="$save_CFLAGS" + ]) +ax_pthread_extra_flags= +AS_IF([test "x$ax_cv_PTHREAD_REJECT_UNKNOWN" != "xno"], + [ax_pthread_extra_flags="$ax_cv_PTHREAD_REJECT_UNKNOWN"]) + +if test x"$ax_pthread_ok" = xno; then +for flag in $ax_pthread_flags; do + + case $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 $flag]) + PTHREAD_CFLAGS="$flag" + ;; + + pthread-config) + AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) + if test x"$ax_pthread_config" = xno; then continue; fi + PTHREAD_CFLAGS="`pthread-config --cflags`" + PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" + ;; + + *) + AC_MSG_CHECKING([for the pthreads library -l$flag]) + PTHREAD_LIBS="-l$flag" + ;; + esac + + save_LIBS="$LIBS" + save_CFLAGS="$CFLAGS" + LIBS="$PTHREAD_LIBS $LIBS" + CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags" + + # Check for various functions. We must include pthread.h, + # since some functions may be macros. (On the Sequent, we + # need a special flag -Kthread to make this header compile.) + # We check for pthread_join because it is in -lpthread on IRIX + # while pthread_create is in libc. We check for pthread_attr_init + # due to DEC craziness with -lpthreads. We check for + # pthread_cleanup_push because it is one of the few pthread + # functions on Solaris that doesn't have a non-functional libc stub. + # We try pthread_create on general principles. + AC_LINK_IFELSE([AC_LANG_PROGRAM([#include + static void routine(void *a) { a = 0; } + static void *start_routine(void *a) { return a; }], + [pthread_t th; pthread_attr_t attr; + pthread_create(&th, 0, start_routine, 0); + pthread_join(th, 0); + pthread_attr_init(&attr); + pthread_cleanup_push(routine, 0); + pthread_cleanup_pop(0) /* ; */])], + [ax_pthread_ok=yes], + []) + + LIBS="$save_LIBS" + CFLAGS="$save_CFLAGS" + + AC_MSG_RESULT([$ax_pthread_ok]) + if test "x$ax_pthread_ok" = xyes; then + break; + fi + + PTHREAD_LIBS="" + PTHREAD_CFLAGS="" +done +fi + +# Various other checks: +if test "x$ax_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_CACHE_CHECK([for joinable pthread attribute], + [ax_cv_PTHREAD_JOINABLE_ATTR], + [ax_cv_PTHREAD_JOINABLE_ATTR=unknown + for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do + AC_LINK_IFELSE([AC_LANG_PROGRAM([#include ], + [int attr = $attr; return attr /* ; */])], + [ax_cv_PTHREAD_JOINABLE_ATTR=$attr; break], + []) + done + ]) + AS_IF([test "$ax_cv_PTHREAD_JOINABLE_ATTR" != unknown && \ + test "$ax_cv_PTHREAD_JOINABLE_ATTR" != PTHREAD_CREATE_JOINABLE], + [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.])]) + + AC_CACHE_CHECK([if more special flags are required for pthreads], + [ax_cv_PTHREAD_SPECIAL_FLAGS], + [ax_cv_PTHREAD_SPECIAL_FLAGS=no + ax_pthread_special_flags_added=no + AC_EGREP_CPP([AX_PTHREAD_NEED_SPECIAL_FLAG], + [ +# if !defined(_REENTRANT) && !defined(_THREAD_SAFE) + AX_PTHREAD_NEED_SPECIAL_FLAG +# endif + ], + [case $host_os in + aix* | freebsd*) + ax_cv_PTHREAD_SPECIAL_FLAGS="-D_THREAD_SAFE" + ;; + darwin* | hpux* | osf* | solaris*) + ax_cv_PTHREAD_SPECIAL_FLAGS="-D_REENTRANT" + ;; + esac + ]) + ]) + AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \ + test "x$ax_pthread_special_flags_added" != "xyes"], + [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS" + ax_pthread_special_flags_added=yes]) + + AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], + [ax_cv_PTHREAD_PRIO_INHERIT], + [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include ]], + [[int i = PTHREAD_PRIO_INHERIT;]])], + [ax_cv_PTHREAD_PRIO_INHERIT=yes], + [ax_cv_PTHREAD_PRIO_INHERIT=no]) + ]) + AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], + [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])]) + + LIBS="$save_LIBS" + CFLAGS="$save_CFLAGS" + + # 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 -- 2.45.2