70 lines
1.8 KiB
Plaintext
Executable File
70 lines
1.8 KiB
Plaintext
Executable File
dnl file : m4/threads.m4
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dnl copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
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dnl license : GNU GPL v2; see accompanying LICENSE file
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dnl
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AC_DEFUN([THREADS],[
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threads_thread_keyword=no
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AC_ARG_ENABLE(
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[threads],
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AS_HELP_STRING([--disable-threads], [disable threads (enabled by default)]),
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[AS_IF([test x"$enableval" = xno], [threads=none], [threads=check])],
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[threads=check])
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# If thread support is not disabled by the user, figure out what we can use.
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#
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if test x$threads = xcheck; then
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case $host_os in
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windows* | mingw*)
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case $host_os in
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mingw*)
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CXXFLAGS="$CXXFLAGS -mthreads"
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;;
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esac
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# Newer versions of GCC can be configured to use either Win32 or POSIX
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# threads. It appears that -mthreads should be used in both cases but
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# if the model is POSIX then GCC will also link -lpthread by default.
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# Use that fact to test which model we have.
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#
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AC_TRY_LINK([#include <pthread.h>],
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[pthread_create(0,0,0,0);],
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[threads=posix],
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[threads=win32])
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;;
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*)
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ACX_PTHREAD
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if test x$acx_pthread_ok = xyes; then
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threads=posix
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LIBS="$LIBS $PTHREAD_LIBS"
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CXXFLAGS="$CXXFLAGS $PTHREAD_CXXFLAGS"
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# Check if we can use the __thread keyword.
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#
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AC_MSG_CHECKING([for __thread keyword])
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CXX_LIBTOOL_LINK_IFELSE([
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AC_LANG_SOURCE([
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__thread int tls_var;
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int
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main ()
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{
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tls_var = 0;
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}
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])],
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[threads_thread_keyword=yes])
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AC_MSG_RESULT([$threads_thread_keyword])
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fi
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;;
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esac
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fi
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if test x$threads = xcheck; then
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AC_MSG_ERROR([thread support not available; use --disable-threads to force single-threaded mode])
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fi
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])dnl
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