configure.ac: Adjust CFI test to test assembler directly rather than checking gcc...

	* configure.ac: Adjust CFI test to test assembler directly rather
	than checking gcc preprocessor macro.
	* configure: Rebuild.

From-SVN: r164713

libgcc/ChangeLog

+2010-09-28  Ian Lance Taylor  <iant@google.com>
+
+	* configure.ac: Adjust CFI test to test assembler directly rather
+	than checking gcc preprocessor macro.
+	* configure: Rebuild.
+
 2010-09-27  Ian Lance Taylor  <iant@google.com>
 
 	* configure.ac: Test whether assembler supports CFI directives.

libgcc/configure

@@ -3715,7 +3715,11 @@ if test "${libgcc_cv_cfi+set}" = set; then :
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-int i = __GCC_HAVE_DWARF2_CFI_ASM;
+asm("\n\
+	.text\n\
+	.cfi_startproc\n\
+	.cfi_personality 0, symbol\n\
+	.cfi_endproc");
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   libgcc_cv_cfi=yes

libgcc/configure.ac

@@ -137,9 +137,14 @@ AC_SUBST(fixed_point)
 
 # Check for assembler CFI support.
 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
-	       [AC_COMPILE_IFELSE([int i = __GCC_HAVE_DWARF2_CFI_ASM;],
-				  [libgcc_cv_cfi=yes],
-				  [libgcc_cv_cfi=no])])
+	       [AC_COMPILE_IFELSE(
+[asm("\n\
+	.text\n\
+	.cfi_startproc\n\
+	.cfi_personality 0, symbol\n\
+	.cfi_endproc");],
+  [libgcc_cv_cfi=yes],
+  [libgcc_cv_cfi=no])])
 
 # Check 32bit or 64bit for x86.
 case ${host} in