[PATCH] fix PR43553 with use of GCC_CHECK_EMUTLS

[Jack Howarth]

Alternative fix for PR43553 which uses the GCC_CHECK_EMUTLS
macro from config/tls.m4 to determine if emulated TLS is in use 
and sets set_use_emutls appropriately. I've verified on x86_64
Fedora 10 linux with this patch that -DHAVE_CC_TLS -DUSE_TLS
is still used in the libgcc build while on x86_64 darwin10
the desired -DHAVE_CC_TLS -DUSE_EMUTLS is used.
Bootstrapped and regression tested on x86_64-apple-darwin10.
Okay for gcc trunk?
                Jack

2010-03-28  Jack Howarth <howarth@bromo.med.uc.edu>

	PR43553
	* Makefile.in (INTERNAL_CFLAGS): Add @set_use_emutls@.
	* configure.ac: Use GCC_CHECK_EMUTLS to see if emulated TLS
	is used and substitute set_use_emutls.
	* configure: Regenerated.

Index: libgcc/Makefile.in
===================================================================
--- libgcc/Makefile.in	(revision 157785)
+++ libgcc/Makefile.in	(working copy)
@@ -226,7 +226,7 @@
 # will usually contain -g, so for the moment CFLAGS goes first.  We must
 # include CFLAGS - that's where multilib options live.
 INTERNAL_CFLAGS = $(CFLAGS) $(LIBGCC2_CFLAGS) $(HOST_LIBGCC2_CFLAGS) \
-		  $(INCLUDES) @set_have_cc_tls@
+		  $(INCLUDES) @set_have_cc_tls@ @set_use_emutls@
 
 MULTIDIR := $(shell $(CC) $(CFLAGS) -print-multi-directory)
 MULTIOSDIR := $(shell $(CC) $(CFLAGS) -print-multi-os-directory)
Index: libgcc/configure.ac
===================================================================
--- libgcc/configure.ac	(revision 157785)
+++ libgcc/configure.ac	(working copy)
@@ -238,6 +238,14 @@
 fi
 AC_SUBST(set_have_cc_tls)
 
+# See if we have emulated thread-local storage.
+GCC_CHECK_EMUTLS
+set_use_emutls=
+if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
+  set_use_emutls="-DUSE_EMUTLS"
+fi
+AC_SUBST(set_use_emutls)
+
 # Conditionalize the makefile for this target machine.
 tmake_file_=
 for f in ${tmake_file}