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Update ax_pthread

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The new version should work around problems with clang and -pthread.
This commit is contained in:
Ari Koivula 2016-05-31 11:56:34 +03:00
parent 4eaacbe23e
commit cd2d1dd1d1
2 changed files with 278 additions and 121 deletions
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12
configure.ac
View file

@ -26,7 +26,7 @@ ver_major=3
ver_minor=6
ver_release=0
# not used, but it prevents configure from adding a lot of defines to the CFLAGS
# Prevents configure from adding a lot of defines to the CFLAGS
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])
@ -52,15 +52,19 @@ AM_CONDITIONAL([HAVE_AVX2], [test x"$flag_avx2" = x"true"])
AM_CONDITIONAL([HAVE_SSE4_1], [test x"$flag_sse4_1" = x"true"])
AM_CONDITIONAL([HAVE_SSE2], [test x"$flag_sse2" = x"true"])
AX_PTHREAD
CFLAGS="-Wall -Wtype-limits -Wvla -I$srcdir/src -ftree-vectorize -fvisibility=hidden $PTHREAD_CFLAGS $CFLAGS"
KVZ_CFLAGS="-Wall -Wtype-limits -Wvla -I$srcdir/src -ftree-vectorize -fvisibility=hidden"
CFLAGS="$KVZ_CFLAGS $CFLAGS"
CPPFLAGS="-DKVZ_DLL_EXPORTS $CPPFLAGS"
AC_SEARCH_LIBS([log], [m c], [], [exit 1])
AC_SEARCH_LIBS([pow], [m c], [], [exit 1])
AC_SEARCH_LIBS([sqrt], [m c], [], [exit 1])
LIBS="$PTHREAD_LIBS $LIBS"
# This does workarounds for pthreads on various compilers.
AX_PTHREAD
CFLAGS="$PTHREAD_CFLAGS $CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
CC="$PTHREAD_CC"
# --disable-werror
AC_ARG_ENABLE([werror], [AS_HELP_STRING([--disable-werror], [don't treat warnings as errors [no]])],

349
m4/ax_pthread.m4
View file

@ -19,10 +19,10 @@
# 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
# but also to link with them as well. For example, you might link with
# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
#
# If you are only building threads programs, you may wish to use these
# If you are only building threaded programs, you may wish to use these
# variables in your default LIBS, CFLAGS, and CC:
#
# LIBS="$PTHREAD_LIBS $LIBS"
@ -30,8 +30,8 @@
# CC="$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).
# has a nonstandard name, this macro 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
@ -82,35 +82,40 @@
# 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
#serial 23
AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
AC_DEFUN([AX_PTHREAD], [
AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PROG_SED])
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).
# 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="$CFLAGS"
if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
ax_pthread_save_CC="$CC"
ax_pthread_save_CFLAGS="$CFLAGS"
ax_pthread_save_LIBS="$LIBS"
AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
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_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"$ax_pthread_ok" = xno; then
if test "x$ax_pthread_ok" = "xno"; then
PTHREAD_LIBS=""
PTHREAD_CFLAGS=""
fi
LIBS="$save_LIBS"
CFLAGS="$save_CFLAGS"
CC="$ax_pthread_save_CC"
CFLAGS="$ax_pthread_save_CFLAGS"
LIBS="$ax_pthread_save_LIBS"
fi
# We must check for the threads library under a number of different
@ -123,7 +128,7 @@ 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 -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
# The ordering *is* (sometimes) important. Some notes on the
# individual items follow:
@ -132,82 +137,225 @@ ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mt
# 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
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
# (Note: HP C rejects this with "bad form for `-t' option")
# -pthreads: Solaris/gcc (Note: HP C also rejects)
# -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; and before -mthreads,
# because the compiler interprets this as "-mt" + "-hreads")
# -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
freebsd*)
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
ax_pthread_flags="-kthread lthread $ax_pthread_flags"
;;
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*)
# 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:
# tests will erroneously succeed. (N.B.: 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 check first for the
# standard Solaris way of linking pthreads (-mt -lpthread).
ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
;;
darwin*)
ax_pthread_flags="-pthread $ax_pthread_flags"
ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
;;
esac
# Clang doesn't consider unrecognized options an error unless we specify
# -Werror. We throw in some extra Clang-specific options to ensure that
# this doesn't happen for GCC, which also accepts -Werror.
# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])
save_CFLAGS="$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"
AS_IF([test "x$GCC" = "xyes"],
[ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
if test x"$ax_pthread_ok" = xno; then
for flag in $ax_pthread_flags; do
# The presence of a feature test macro requesting re-entrant function
# definitions is, on some systems, a strong hint that pthreads support is
# correctly enabled
case $flag in
case $host_os in
darwin* | hpux* | linux* | osf* | solaris*)
ax_pthread_check_macro="_REENTRANT"
;;
aix*)
ax_pthread_check_macro="_THREAD_SAFE"
;;
*)
ax_pthread_check_macro="--"
;;
esac
AS_IF([test "x$ax_pthread_check_macro" = "x--"],
[ax_pthread_check_cond=0],
[ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
# Are we compiling with Clang?
AC_CACHE_CHECK([whether $CC is Clang],
[ax_cv_PTHREAD_CLANG],
[ax_cv_PTHREAD_CLANG=no
# Note that Autoconf sets GCC=yes for Clang as well as GCC
if test "x$GCC" = "xyes"; then
AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
[/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
# if defined(__clang__) && defined(__llvm__)
AX_PTHREAD_CC_IS_CLANG
# endif
],
[ax_cv_PTHREAD_CLANG=yes])
fi
])
ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
ax_pthread_clang_warning=no
# Clang needs special handling, because older versions handle the -pthread
# option in a rather... idiosyncratic way
if test "x$ax_pthread_clang" = "xyes"; then
# Clang takes -pthread; it has never supported any other flag
# (Note 1: This will need to be revisited if a system that Clang
# supports has POSIX threads in a separate library. This tends not
# to be the way of modern systems, but it's conceivable.)
# (Note 2: On some systems, notably Darwin, -pthread is not needed
# to get POSIX threads support; the API is always present and
# active. We could reasonably leave PTHREAD_CFLAGS empty. But
# -pthread does define _REENTRANT, and while the Darwin headers
# ignore this macro, third-party headers might not.)
PTHREAD_CFLAGS="-pthread"
PTHREAD_LIBS=
ax_pthread_ok=yes
# However, older versions of Clang make a point of warning the user
# that, in an invocation where only linking and no compilation is
# taking place, the -pthread option has no effect ("argument unused
# during compilation"). They expect -pthread to be passed in only
# when source code is being compiled.
#
# Problem is, this is at odds with the way Automake and most other
# C build frameworks function, which is that the same flags used in
# compilation (CFLAGS) are also used in linking. Many systems
# supported by AX_PTHREAD require exactly this for POSIX threads
# support, and in fact it is often not straightforward to specify a
# flag that is used only in the compilation phase and not in
# linking. Such a scenario is extremely rare in practice.
#
# Even though use of the -pthread flag in linking would only print
# a warning, this can be a nuisance for well-run software projects
# that build with -Werror. So if the active version of Clang has
# this misfeature, we search for an option to squash it.
AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
[ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
# Create an alternate version of $ac_link that compiles and
# links in two steps (.c -> .o, .o -> exe) instead of one
# (.c -> exe), because the warning occurs only in the second
# step
ax_pthread_save_ac_link="$ac_link"
ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
ax_pthread_save_CFLAGS="$CFLAGS"
for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
ac_link="$ax_pthread_save_ac_link"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
[ac_link="$ax_pthread_2step_ac_link"
AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
[break])
])
done
ac_link="$ax_pthread_save_ac_link"
CFLAGS="$ax_pthread_save_CFLAGS"
AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
])
case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
no | unknown) ;;
*) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
esac
fi # $ax_pthread_clang = yes
if test "x$ax_pthread_ok" = "xno"; then
for ax_pthread_try_flag in $ax_pthread_flags; do
case $ax_pthread_try_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"
AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
PTHREAD_CFLAGS="$ax_pthread_try_flag"
;;
pthread-config)
AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
if test x"$ax_pthread_config" = xno; then continue; fi
AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
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"
AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
PTHREAD_LIBS="-l$ax_pthread_try_flag"
;;
esac
save_LIBS="$LIBS"
save_CFLAGS="$CFLAGS"
ax_pthread_save_CFLAGS="$CFLAGS"
ax_pthread_save_LIBS="$LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
LIBS="$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
@ -218,7 +366,11 @@ for flag in $ax_pthread_flags; do
# 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>
# if $ax_pthread_check_cond
# error "$ax_pthread_check_macro must be defined"
# endif
static void routine(void *a) { a = 0; }
static void *start_routine(void *a) { return a; }],
[pthread_t th; pthread_attr_t attr;
@ -230,13 +382,11 @@ for flag in $ax_pthread_flags; do
[ax_pthread_ok=yes],
[])
LIBS="$save_LIBS"
CFLAGS="$save_CFLAGS"
CFLAGS="$ax_pthread_save_CFLAGS"
LIBS="$ax_pthread_save_LIBS"
AC_MSG_RESULT([$ax_pthread_ok])
if test "x$ax_pthread_ok" = xyes; then
break;
fi
AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
PTHREAD_LIBS=""
PTHREAD_CFLAGS=""
@ -244,62 +394,65 @@ done
fi
# Various other checks:
if test "x$ax_pthread_ok" = xyes; then
save_LIBS="$LIBS"
LIBS="$PTHREAD_LIBS $LIBS"
save_CFLAGS="$CFLAGS"
if test "x$ax_pthread_ok" = "xyes"; then
ax_pthread_save_CFLAGS="$CFLAGS"
ax_pthread_save_LIBS="$LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
LIBS="$PTHREAD_LIBS $LIBS"
# 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_CACHE_CHECK([for joinable pthread attribute],
[ax_cv_PTHREAD_JOINABLE_ATTR],
[ax_cv_PTHREAD_JOINABLE_ATTR=unknown
for ax_pthread_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],
[int attr = $ax_pthread_attr; return attr /* ; */])],
[ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
[])
done
AC_MSG_RESULT([$attr_name])
if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name],
])
AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
test "x$ax_pthread_joinable_attr_defined" != "xyes"],
[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.])
fi
ax_pthread_joinable_attr_defined=yes
])
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";;
AC_CACHE_CHECK([whether more special flags are required for pthreads],
[ax_cv_PTHREAD_SPECIAL_FLAGS],
[ax_cv_PTHREAD_SPECIAL_FLAGS=no
case $host_os in
solaris*)
if test "$GCC" = "yes"; then
flag="-D_REENTRANT"
else
# TODO: What about Clang on Solaris?
flag="-mt -D_REENTRANT"
fi
ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
;;
esac
AC_MSG_RESULT([$flag])
if test "x$flag" != xno; then
PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
fi
])
AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
test "x$ax_pthread_special_flags_added" != "xyes"],
[PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
ax_pthread_special_flags_added=yes])
AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
[ax_cv_PTHREAD_PRIO_INHERIT], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
[ax_cv_PTHREAD_PRIO_INHERIT],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
[[int i = PTHREAD_PRIO_INHERIT;]])],
[ax_cv_PTHREAD_PRIO_INHERIT=yes],
[ax_cv_PTHREAD_PRIO_INHERIT=no])
])
AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
[AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])])
AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
test "x$ax_pthread_prio_inherit_defined" != "xyes"],
[AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
ax_pthread_prio_inherit_defined=yes
])
LIBS="$save_LIBS"
CFLAGS="$save_CFLAGS"
CFLAGS="$ax_pthread_save_CFLAGS"
LIBS="$ax_pthread_save_LIBS"
# More AIX lossage: compile with *_r variant
if test "x$GCC" != xyes; then
if test "x$GCC" != "xyes"; then
case $host_os in
aix*)
AS_CASE(["x/$CC"],
@ -321,7 +474,7 @@ AC_SUBST([PTHREAD_CFLAGS])
AC_SUBST([PTHREAD_CC])
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$ax_pthread_ok" = xyes; then
if test "x$ax_pthread_ok" = "xyes"; then
ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
:
else