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dnl file : m4/threads.m4
dnl copyright : Copyright (c) 2009-2017 Code Synthesis Tools CC
dnl license : GNU GPL v2; see accompanying LICENSE file
dnl
AC_DEFUN([THREADS],[
threads_thread_keyword=no
AC_ARG_ENABLE(
[threads],
AS_HELP_STRING([--disable-threads], [disable threads (enabled by default)]),
[AS_IF([test x"$enableval" = xno], [threads=none], [threads=check])],
[threads=check])
# If thread support is not disabled by the user, figure out what we can use.
#
if test x$threads = xcheck; then
case $host_os in
windows* | mingw*)
case $host_os in
mingw*)
CXXFLAGS="$CXXFLAGS -mthreads"
;;
esac
# Newer versions of GCC can be configured to use either Win32 or POSIX
# threads. It appears that -mthreads should be used in both cases but
# if the model is POSIX then GCC will also link -lpthread by default.
# Use that fact to test which model we have.
#
AC_TRY_LINK([#include <pthread.h>],
[pthread_create(0,0,0,0);],
[threads=posix],
[threads=win32])
;;
*)
ACX_PTHREAD
if test x$acx_pthread_ok = xyes; then
threads=posix
LIBS="$LIBS $PTHREAD_LIBS"
CXXFLAGS="$CXXFLAGS $PTHREAD_CXXFLAGS"
# Check if we can use the __thread keyword.
#
AC_MSG_CHECKING([for __thread keyword])
CXX_LIBTOOL_LINK_IFELSE([
AC_LANG_SOURCE([
__thread int tls_var;
int
main ()
{
tls_var = 0;
}
])],
[threads_thread_keyword=yes])
AC_MSG_RESULT([$threads_thread_keyword])
fi
;;
esac
fi
if test x$threads = xcheck; then
AC_MSG_ERROR([thread support not available; use --disable-threads to force single-threaded mode])
fi
])dnl
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