re PR target/26792 (need to use autoconf when using newly-added libgcc functions)

	PR target/26792
	* unwind_ipinfo.m4: New.

From-SVN: r115653

config/ChangeLog

+2006-07-21  Steve Ellcey  <sje@cup.hp.com>
+
+	PR target/26792
+	* unwind_ipinfo.m4: New.
+
 2006-07-21  David Daney  <ddaney@avtrex.com>
 
 	PR libgcj/28426

config/unwind_ipinfo.m4

+dnl
+dnl Check whether _Unwind_GetIPInfo is available.
+dnl
+AC_DEFUN([GCC_CHECK_UNWIND_GETIPINFO], [
+  AC_LANG_SAVE
+  AC_LANG_CPLUSPLUS
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -fno-exceptions"
+  AC_MSG_CHECKING([for _Unwind_GetIPInfo])
+  AC_CACHE_VAL(gcc_cv_getipinfo, [
+  AC_TRY_LINK([extern "C" { extern void _Unwind_GetIPInfo(); }],
+      [_Unwind_GetIPInfo();],
+      [gcc_cv_getipinfo=yes],
+      [gcc_cv_getipinfo=no])
+  ])
+  if test $gcc_cv_getipinfo = yes; then
+    AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
+  fi
+  AC_MSG_RESULT($gcc_cv_getipinfo)
+  CXXFLAGS="$ac_save_CXXFLAGS"
+  AC_LANG_RESTORE
+])