newlib/config/tls.m4
Paolo Bonzini 14a1406e83 2006-12-19 Paolo Bonzini <bonzini@gnu.org>
Sync with gcc:

	2006-12-19  Paolo Bonzini  <bonzini@gnu.org>

	* configure.in: Remove "$build" case for powerpc-*-darwin* since
	it only affects bootstrap and could be tested on "$host" as well.
	* configure: Regenerate.
	* config/mh-ppc-darwin: Add to the stage1 cflags here.

	2006-12-19  Paolo Bonzini  <bonzini@gnu.org>

	PR bootstrap/29544
	* Makefile.def (flags_to_pass): Add STAGE1_CHECKING.
	(bootstrap_stage): Add STAGE1_CHECKING to stage1 configure flags,
	move here comment from Makefile.tpl.
	* Makefile.tpl: Move some definitions higher in the file.
	(STAGE1_CHECKING): New.
	* configure.in: Add --enable-stage1-checking.
	* configure: Regenerate.
	* Makefile.in: Regenerate.

	2006-12-03  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>

	* configure.in: Update error message for missing GMP/MPFR.

	* configure: Regenerate.

	2006-12-02  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>

	* configure.in: Update MPFR version in error message.

	* configure: Regenerate.

	2006-11-26  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>

	* configure.in (--with-mpfr-dir, --with-gmp-dir): Remove flags.
	(--with-mpfr-include, --with-mpfr-lib, --with-gmp-include,
	--with-gmp-lib): New flags.

	* configure: Regenerate.

config:
2006-12-04  Eric Botcazou  <ebotcazou@libertysurf.fr>

	* tls.m4 (GCC_CHECK_TLS): Do not test TLS with static linking
	if static linking doesn't even work.
2006-12-19 12:52:58 +00:00

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dnl Check whether the target supports TLS.
AC_DEFUN([GCC_CHECK_TLS], [
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
AC_CACHE_CHECK([whether the target supports thread-local storage],
have_tls, [
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
[dnl If the test case passed with dynamic linking, try again with
dnl static linking, but only if static linking is supported (not
dnl on Solaris 10). This fails with some older Red Hat releases.
save_LDFLAGS="$LDFLAGS"
LDFLAGS="-static $LDFLAGS"
AC_LINK_IFELSE([int main() { return 0; }],
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
[have_tls=yes], [have_tls=no],[]),
[have_tls=yes])
LDFLAGS="$save_LDFLAGS"],
[have_tls=no],
[AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
[have_tls=yes], [have_tls=no])]
)])
if test "$enable_tls $have_tls" = "yes yes"; then
AC_DEFINE(HAVE_TLS, 1,
[Define to 1 if the target supports thread-local storage.])
fi])