re PR target/55061 (libbacktrace build fails during bootstrap on powerpc-apple-darwin9)

	PR target/55061
	* configure.ac: Check for _Unwind_GetIPInfo function declaration.
	* configure: Regenerate.

From-SVN: r192853

libbacktrace/ChangeLog

+2012-10-26  Jack Howarth  <howarth@bromo.med.uc.edu>
+
+	PR target/55061
+	* configure.ac: Check for _Unwind_GetIPInfo function declaration.
+	* configure: Regenerate.
+
 2012-10-24  Ian Lance Taylor  <iant@google.com>
 
 	PR target/55061

libbacktrace/configure

@@ -11619,13 +11619,32 @@ $as_echo "#define HAVE_GETIPINFO 1" >>confdefs.h
   fi
 
 else
-  ac_fn_c_check_func "$LINENO" "_Unwind_GetIPInfo" "ac_cv_func__Unwind_GetIPInfo"
-if test "x$ac_cv_func__Unwind_GetIPInfo" = x""yes; then :
+  ac_save_CFFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for _Unwind_GetIPInfo" >&5
+$as_echo_n "checking for _Unwind_GetIPInfo... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include "unwind.h"
+	struct _Unwind_Context *context;
+	int ip_before_insn = 0;
+int
+main ()
+{
+return _Unwind_GetIPInfo (context, &ip_before_insn);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
   have_unwind_getipinfo=yes
 else
   have_unwind_getipinfo=no
 fi
-
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  CFLAGS="$ac_save_CFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $have_unwind_getipinfo" >&5
+$as_echo "$have_unwind_getipinfo" >&6; }
   if test "$have_unwind_getipinfo" = "yes"; then
 
 $as_echo "#define HAVE_GETIPINFO 1" >>confdefs.h

libbacktrace/configure.ac

@@ -129,8 +129,18 @@ AC_SUBST(WARN_FLAGS)
 if test -n "${with_target_subdir}"; then
   GCC_CHECK_UNWIND_GETIPINFO
 else
-  AC_CHECK_FUNC(_Unwind_GetIPInfo, [have_unwind_getipinfo=yes],
-		[have_unwind_getipinfo=no])
+  ac_save_CFFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
+  AC_MSG_CHECKING([for _Unwind_GetIPInfo])
+  AC_COMPILE_IFELSE(
+    [AC_LANG_PROGRAM(
+       [#include "unwind.h"
+	struct _Unwind_Context *context;
+	int ip_before_insn = 0;],
+	[return _Unwind_GetIPInfo (context, &ip_before_insn);])],
+	[have_unwind_getipinfo=yes], [have_unwind_getipinfo=no])
+  CFLAGS="$ac_save_CFLAGS"
+  AC_MSG_RESULT([$have_unwind_getipinfo])
   if test "$have_unwind_getipinfo" = "yes"; then
     AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
   fi