re PR debug/53453 (darwin linker expects both AT_name and AT_comp_dir debug notes)

2012-05-29  Jack Howarth  <howarth@bromo.med.uc.edu>

	PR debug/53453
	* doc/tm.texi: Update.
	* doc/tm.texi.in (SDB and DWARF) <TARGET_FORCE_AT_COMP_DIR>: Add @hook.
	* target.def (force_at_comp_dir): New hook.
	* config/darwin.h (TARGET_FORCE_AT_COMP_DIR): Define.
	* dwarf2out.c (dwarf2out_finish): Check targetm.force_at_comp_dir.

From-SVN: r187994

gcc/ChangeLog

 2012-05-29  Jack Howarth  <howarth@bromo.med.uc.edu>
 
+	PR debug/53453
+	* doc/tm.texi: Update.
+	* doc/tm.texi.in (SDB and DWARF) <TARGET_FORCE_AT_COMP_DIR>: Add @hook.
+	* target.def (force_at_comp_dir): New hook.
+	* config/darwin.h (TARGET_FORCE_AT_COMP_DIR): Define.
+	* dwarf2out.c (dwarf2out_finish): Check targetm.force_at_comp_dir.
+
+2012-05-29  Jack Howarth  <howarth@bromo.med.uc.edu>
+
 	* config/darwin.h (STARTFILE_SPEC): Do not use -lbundle1.o when
 	Darwin >= 10.
 	(DARWIN_DYLIB1_SPEC): Do not use -ldylib1.10.5.o when Darwin >= 10.

gcc/config/darwin.h

@@ -416,6 +416,8 @@ extern GTY(()) int darwin_ms_struct;
 
 #define TARGET_WANT_DEBUG_PUB_SECTIONS true
 
+#define TARGET_FORCE_AT_COMP_DIR true
+
 /* When generating stabs debugging, use N_BINCL entries.  */
 
 #define DBX_USE_BINCL

gcc/doc/tm.texi

@@ -9493,6 +9493,10 @@ tables, and hence is desirable if it works.
 True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections should be emitted.  These sections are not used on most platforms, and in particular GDB does not use them.
 @end deftypevr
 
+@deftypevr {Target Hook} bool TARGET_FORCE_AT_COMP_DIR
+True if the @code{DW_AT_comp_dir} attribute should be emitted for each  compilation unit.  This attribute is required for the darwin linker  to emit debug information.
+@end deftypevr
+
 @deftypevr {Target Hook} bool TARGET_DELAY_SCHED2
 True if sched2 is not to be run at its normal place.  This usually means it will be run as part of machine-specific reorg.
 @end deftypevr

gcc/doc/tm.texi.in

@@ -9392,6 +9392,8 @@ tables, and hence is desirable if it works.
 
 @hook TARGET_WANT_DEBUG_PUB_SECTIONS
 
+@hook TARGET_FORCE_AT_COMP_DIR
+
 @hook TARGET_DELAY_SCHED2
 
 @hook TARGET_DELAY_VARTRACK

gcc/dwarf2out.c

@@ -22078,7 +22078,7 @@ dwarf2out_finish (const char *filename)
   /* Add the name for the main input file now.  We delayed this from
      dwarf2out_init to avoid complications with PCH.  */
   add_name_attribute (comp_unit_die (), remap_debug_filename (filename));
-  if (!IS_ABSOLUTE_PATH (filename))
+  if (!IS_ABSOLUTE_PATH (filename) || targetm.force_at_comp_dir)
     add_comp_dir_attribute (comp_unit_die ());
   else if (get_AT (comp_unit_die (), DW_AT_comp_dir) == NULL)
     {

gcc/target.def

@@ -2749,6 +2749,13 @@ DEFHOOKPOD
  bool, false)
 
 DEFHOOKPOD
+(force_at_comp_dir,
+ "True if the @code{DW_AT_comp_dir} attribute should be emitted for each \
+ compilation unit.  This attribute is required for the darwin linker \
+ to emit debug information.",
+ bool, false)
+
+DEFHOOKPOD
 (delay_sched2, "True if sched2 is not to be run at its normal place.  \
 This usually means it will be run as part of machine-specific reorg.",
 bool, false)