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dnl #
dnl # Figure out which storage class specifier for Thread Local Storage is supported by the compiler
dnl #
AC_DEFUN([FR_TLS],
[
dnl #
dnl # See if the compilation works with __thread, for thread-local storage
dnl #
AC_MSG_CHECKING(for __thread support in compiler)
AC_RUN_IFELSE(
[AC_LANG_SOURCE(
[[
static __thread int val;
int main(int argc, char **argv) {
val = 0;
return val;
}
]])
],[have_tls=yes],[have_tls=no],[have_tls=no])
AC_MSG_RESULT($have_tls)
if test "x$have_tls" = "xyes"; then
AC_DEFINE([TLS_STORAGE_CLASS],[__thread],[Define if the compiler supports a thread local storage class])
fi
dnl #
dnl # __declspec(thread) does exactly the same thing as __thread, but is supported by MSVS
dnl #
if test "x$have_tls" = "xno"; then
AC_MSG_CHECKING(for __declspec(thread) support in compiler)
AC_RUN_IFELSE(
[AC_LANG_SOURCE(
[[
static _Thread_local int val;
int main(int argc, char **argv) {
val = 0;
return val;
}
]])
],[have_tls=yes],[have_tls=no],[have_tls=no])
AC_MSG_RESULT($have_tls)
if test "x$have_tls" = "xyes"; then
AC_DEFINE([TLS_STORAGE_CLASS],[__declspec(thread)],[Define if the compiler supports a thread local storage class])
fi
fi
dnl #
dnl # _Thread_local does exactly the same thing as __thread, but it's standards compliant with C11.
dnl # we, however, state we are only compliant with C99, so the compiler will probably emit warnings
dnl # if we use it. So save it as a last resort.
dnl #
if test "x$have_tls" = "xno"; then
AC_MSG_CHECKING(for _Thread_local support in compiler)
AC_RUN_IFELSE(
[AC_LANG_SOURCE(
[[
static _Thread_local int val;
int main(int argc, char **argv) {
val = 0;
return val;
}
]])
],[have_tls=yes],[have_tls=no],[have_tls=no])
AC_MSG_RESULT($have_tls)
if test "x$have_tls" = "xyes"; then
AC_DEFINE([TLS_STORAGE_CLASS],[_Thread_local],[Define if the compiler supports a thread local storage class])
fi
fi
])
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