RFA: Remove automatic enabling of gas cfi directives with an in-source-tree assembler

[Nick Clifton]

Hi Guys,

  The recent patches that support for the GAS CFI directives has a
  problem in that the configure file enables this feature if the
  target is built with an in-tree set of gas sources from release 
  2.17 or newer of the binutils.  This is a problem, because the gas
  cfi directives are only enabled on a per-target basis in the
  assembler and not all targets currently support them, even in the
  very latest sources.  (Eg Vax, MN10300).

  The attached patch removes the assembler version check from the "cfi
  directive" and "cfi personality directive" checks so that configure
  will always perform an actual test of the assembler's capabilities.

  Checked without regressions building an mn10300-elf toolchain as
  well as an x86_64-pc-linux-gnu native toolchain in a combined
  gcc/gdb/binutils source tree.

  May I apply this patch please ?

Cheers
  Nick

gcc/ChangeLog
2008-08-17  Nick Clifton  <nickc@redhat.com>

	* configure.ac (HAVE_GAS_CFI_DIRECTIVE): Always test for assembler
	support of this feature.  Do not assume that a sufficiently new
	assembler will support the feature regardless of the target type.
	(HAVE_GAS_CFI_PERSONALITY_DIRECTIVE): Likewise.
        * configure: Regenerate.

Index: gcc/configure.ac
===================================================================
--- gcc/configure.ac	(revision 139178)
+++ gcc/configure.ac	(working copy)
@@ -2182,7 +2182,7 @@
 
 # Check if we have assembler support for unwind directives.
 gcc_GAS_CHECK_FEATURE([cfi directives], gcc_cv_as_cfi_directive,
-  [elf,2,17,0],,
+  ,,
 [	.text
 	.cfi_startproc
 	.cfi_offset 0, 0
@@ -2195,7 +2195,7 @@
   [Define 0/1 if your assembler supports CFI directives.])
 
 gcc_GAS_CHECK_FEATURE([cfi personality directive],
-  gcc_cv_as_cfi_personality_directive, [elf,2,17,0],,
+  gcc_cv_as_cfi_personality_directive, ,,
 [	.text
 	.cfi_startproc,
 	.cfi_personality 0, symbol