+
+dnl Check whether TLS is emulated.
+AC_DEFUN([GCC_CHECK_EMUTLS], [
+ AC_CACHE_CHECK([whether the thread-local storage support is from emutls],
+ gcc_cv_use_emutls, [
+ gcc_cv_use_emutls=no
+ echo '__thread int a; int b; int main() { return a = b; }' > conftest.c
+ if AC_TRY_COMMAND(${CC-cc} -Werror -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD); then
+ if grep __emutls_get_address conftest.s > /dev/null; then
+ gcc_cv_use_emutls=yes
+ fi
+ fi
+ rm -f conftest.*
+ ])
+ if test "$gcc_cv_use_emutls" = "yes" ; then
+ AC_DEFINE(USE_EMUTLS, 1,
+ [Define to 1 if the target use emutls for thread-local storage.])
+ fi])