[PATCH xserver] Add ax_pthread.m4 to m4/
Peter Hutterer
peter.hutterer at who-t.net
Mon May 30 01:42:08 UTC 2016
On Sat, May 28, 2016 at 04:51:46PM -0700, Keith Packard wrote:
> Threaded input requires AX_PTHREAD, which is provided by this file.
>
> Signed-off-by: Keith Packard <keithp at keithp.com>
Acked-by: Peter Hutterer <peter.hutterer at who-t.net>
Cheers,
Peter
> ---
> m4/ax_pthread.m4 | 337 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 337 insertions(+)
> create mode 100644 m4/ax_pthread.m4
>
> diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
> new file mode 100644
> index 0000000..e77541c
> --- /dev/null
> +++ b/m4/ax_pthread.m4
> @@ -0,0 +1,337 @@
> +# ===========================================================================
> +# 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 <stevenj at alum.mit.edu>
> +# Copyright (c) 2011 Daniel Richard G. <skunk at iSKUNK.ORG>
> +#
> +# 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 <http://www.gnu.org/licenses/>.
> +#
> +# 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_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 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=$PTHREAD_CFLAGS])
> + AC_TRY_LINK_FUNC([pthread_join], [ax_pthread_ok=yes])
> + AC_MSG_RESULT([$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 -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_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:
> +
> + ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
> + ;;
> +
> + darwin*)
> + ax_pthread_flags="-pthread $ax_pthread_flags"
> + ;;
> + netbsd*)
> + # use libc stubs, don't link against libpthread, to allow
> + # dynamic loading
> + ax_pthread_flags=""
> + ;;
> +esac
> +
> +# Clang doesn't consider unrecognized options an error unless we specify
> +# -Werror. We throw in some extra Clang-specific options to ensure that
> +# this doesn't happen for GCC, which also accepts -Werror.
> +
> +AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])
> +save_CFLAGS="$CFLAGS"
> +ax_pthread_extra_flags="-Werror"
> +CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument"
> +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])],
> + [AC_MSG_RESULT([yes])],
> + [ax_pthread_extra_flags=
> + AC_MSG_RESULT([no])])
> +CFLAGS="$save_CFLAGS"
> +
> +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])
> + ;;
> +
> + -*)
> + 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 $ax_pthread_extra_flags"
> +
> + # Check for various functions. We must include pthread.h,
> + # since some functions may be macros. (On the Sequent, we
> + # need a special flag -Kthread to make this header compile.)
> + # We check for pthread_join because it is in -lpthread on IRIX
> + # while pthread_create is in libc. We check for pthread_attr_init
> + # due to DEC craziness with -lpthreads. We check for
> + # pthread_cleanup_push because it is one of the few pthread
> + # functions on Solaris that doesn't have a non-functional libc stub.
> + # We try pthread_create on general principles.
> + AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
> + static void routine(void *a) { a = 0; }
> + static void *start_routine(void *a) { return a; }],
> + [pthread_t th; pthread_attr_t attr;
> + pthread_create(&th, 0, start_routine, 0);
> + pthread_join(th, 0);
> + pthread_attr_init(&attr);
> + pthread_cleanup_push(routine, 0);
> + pthread_cleanup_pop(0) /* ; */])],
> + [ax_pthread_ok=yes],
> + [])
> +
> + LIBS="$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_MSG_CHECKING([for joinable pthread attribute])
> + attr_name=unknown
> + for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
> + AC_LINK_IFELSE([AC_LANG_PROGRAM([#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 ${host_os} in
> + aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
> + osf* | hpux*) flag="-D_REENTRANT";;
> + solaris*)
> + if test "$GCC" = "yes"; then
> + flag="-D_REENTRANT"
> + else
> + # TODO: What about Clang on Solaris?
> + flag="-mt -D_REENTRANT"
> + fi
> + ;;
> + esac
> + AC_MSG_RESULT([$flag])
> + if test "x$flag" != xno; then
> + PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
> + fi
> +
> + AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
> + [ax_cv_PTHREAD_PRIO_INHERIT], [
> + AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
> + [[int i = PTHREAD_PRIO_INHERIT;]])],
> + [ax_cv_PTHREAD_PRIO_INHERIT=yes],
> + [ax_cv_PTHREAD_PRIO_INHERIT=no])
> + ])
> + AS_IF([test "x$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
> --
> 2.8.1
>
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