re PR target/37610 (FAIL: g++.dg/eh/pr29166.C execution test)

	PR target/37610
	* configure.ac (gcc_cv_readelf): Look for readelf.
	(gcc_cv_as_cfi_advance_working): Check for working
	cfi advances with code alignment factor > 1.
	(HAVE_GAS_CFI_DIRECTIVE): Don't define if cfi advances
	don't work properly.
	* configure: Regenerated.

From-SVN: r142389

gcc/ChangeLog

+2008-12-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/37610
+	* configure.ac (gcc_cv_readelf): Look for readelf.
+	(gcc_cv_as_cfi_advance_working): Check for working
+	cfi advances with code alignment factor > 1.
+	(HAVE_GAS_CFI_DIRECTIVE): Don't define if cfi advances
+	don't work properly.
+	* configure: Regenerated.
+
 2008-12-03  Eric Botcazou  <ebotcazou@adacore.com>
             Jakub Jelinek  <jakub@redhat.com>
             Andrew Pinski  <andrew_pinski@playstation.sony.com>

gcc/configure.ac

@@ -2005,6 +2005,29 @@ else
 	AC_MSG_RESULT($gcc_cv_objdump)
 fi
 
+# Figure out what readelf we will be using.
+AS_VAR_SET_IF(gcc_cv_readelf,, [
+if test -f $gcc_cv_binutils_srcdir/configure.in \
+     && test -f ../binutils/Makefile \
+     && test x$build = x$host; then
+	# Single tree build which includes binutils.
+	gcc_cv_readelf=../binutils/readelf$build_exeext
+elif test -x readelf$build_exeext; then
+	gcc_cv_readelf=./readelf$build_exeext
+else
+        AC_PATH_PROG(gcc_cv_readelf, readelf)
+fi])
+
+AC_MSG_CHECKING(what readelf to use)
+if test "$gcc_cv_readelf" = ../binutils/readelf$build_exeext; then
+	# Single tree build which includes binutils.
+	AC_MSG_RESULT(newly built readelf)
+elif test x$gcc_cv_readelf = x; then
+	AC_MSG_RESULT(not found)
+else
+	AC_MSG_RESULT($gcc_cv_readelf)
+fi
+
 # Figure out what assembler alignment features are present.
 gcc_GAS_CHECK_FEATURE([.balign and .p2align], gcc_cv_as_balign_and_p2align,
  [2,6,0],,
@@ -2234,8 +2257,29 @@ gcc_GAS_CHECK_FEATURE([cfi directives], gcc_cv_as_cfi_directive,
     gcc_cv_as_cfi_directive=yes
     ;;
 esac])
+if test $gcc_cv_as_cfi_directive = yes && test x$gcc_cv_readelf != x; then
+gcc_GAS_CHECK_FEATURE([working cfi advance], gcc_cv_as_cfi_advance_working,
+  ,,
+[	.text
+	.cfi_startproc
+	.cfi_adjust_cfa_offset 64
+	.skip 512, 0
+	.cfi_adjust_cfa_offset 128
+	.cfi_endproc],
+[
+changequote(,)dnl
+if $gcc_cv_readelf -wf conftest.o 2>/dev/null \
+    | grep 'DW_CFA_advance_loc[12]:[ 	][ 	]*512[ 	]' >/dev/null; then
+   gcc_cv_as_cfi_advance_working=yes
+fi
+changequote([,])dnl
+])
+else
+  gcc_cv_as_cfi_advance_working=yes
+fi
 AC_DEFINE_UNQUOTED(HAVE_GAS_CFI_DIRECTIVE,
-  [`if test $gcc_cv_as_cfi_directive = yes; then echo 1; else echo 0; fi`],
+  [`if test $gcc_cv_as_cfi_directive = yes \
+       && test $gcc_cv_as_cfi_advance_working = yes; then echo 1; else echo 0; fi`],
   [Define 0/1 if your assembler supports CFI directives.])
 
 gcc_GAS_CHECK_FEATURE([cfi personality directive],