re PR bootstrap/41405 (Bootstrap fails on *-apple-darwin* due to revision 151815)

        PR bootstrap/41405
        * common.opt: Initialize dwarf_strict to -1.
        * toplev.c (process_options): Catch unset dwarf_strict
        and set to 0 for all targets not overriding.
        * config/darwin.c (darwin_override_options): Catch unset
        dwarf_strict and override to 1.

From-SVN: r152127

gcc/ChangeLog

+2009-09-24  Iain Sandoe  <iain.sandoe@sandoe-acoustics.co.uk>
+
+	PR bootstrap/41405
+        * common.opt: Initialize dwarf_strict to -1.
+	* toplev.c (process_options): Catch unset dwarf_strict
+	and set to 0 for all targets not overriding.
+	* config/darwin.c (darwin_override_options): Catch unset
+	dwarf_strict and override to 1.
+
 2009-09-24  Jeff Law  <law@redhat.com>
 
 	* tree-into-ssa.c (rewrite_into_ssa): Free interesting_blocks. 

gcc/common.opt

@@ -1473,7 +1473,7 @@ Common JoinedOrMissing Negative(gvms)
 Generate debug information in extended STABS format
 
 gno-strict-dwarf
-Common RejectNegative Var(dwarf_strict,0)
+Common RejectNegative Var(dwarf_strict,0) Init(-1)
 Emit DWARF additions beyond selected version
 
 gstrict-dwarf

gcc/config/darwin.c

@@ -1692,6 +1692,11 @@ darwin_kextabi_p (void) {
 void
 darwin_override_options (void)
 {
+  /* Don't emit DWARF3/4 unless specifically selected.  This is a 
+     workaround for tool bugs.  */
+  if (dwarf_strict < 0) 
+    dwarf_strict = 1;
+
   if (flag_mkernel || flag_apple_kext)
     {
       /* -mkernel implies -fapple-kext for C++ */

gcc/toplev.c

@@ -1910,6 +1910,11 @@ process_options (void)
 	}
     }
 
+  /* Unless over-ridden for the target, assume that all DWARF levels
+     may be emitted, if DWARF2_DEBUG is selected.  */
+  if (dwarf_strict < 0) 
+    dwarf_strict = 0;
+
   /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
      level is 0.  */
   if (debug_info_level == DINFO_LEVEL_NONE)