Darwin does not support gsplit-dwarf.

2018-08-18  Iain Sandoe  <iain@sandoe.co.uk>

gcc/

	* config/darwin.c (darwin_override_options): If -gsplit-dwarf is set,
	emit a diagnostic that it is not supported and reset the option.
	* config/darwin.h (DRIVER_SELF_SPECS): Note that gsplit-dwarf is not
	supported and consume the option.  (ASM_FINAL_SPEC): New.

gcc/testsuite

	* g++.dg/debug/dwarf2/pr85302.C: Skip unsupported split DWARF
	test on Darwin.
	* g++.dg/debug/dwarf2/pr85302.C: Likewise.
	* gcc.dg/lto/pr83719_0.c: Likewise.

From-SVN: r263645

gcc/ChangeLog

+2018-08-18  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* config/darwin.c (darwin_override_options): If -gsplit-dwarf is set,
+	emit a diagnostic that it is not supported and reset the option.
+	* config/darwin.h (DRIVER_SELF_SPECS): Note that gsplit-dwarf is not
+	supported and consume the option.  (ASM_FINAL_SPEC): New.
+
 2018-08-17  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* doc/md.texi (Patterns): Use @ref instead of @xref in the middle of

gcc/config/darwin.c

@@ -3176,6 +3176,14 @@ darwin_override_options (void)
   if (!global_options_set.x_dwarf_version)
     dwarf_version = 2;
 
+  if (global_options_set.x_dwarf_split_debug_info)
+    {
+      inform (input_location,
+	      "-gsplit-dwarf is not supported on this platform, ignored");
+      dwarf_split_debug_info = 0;
+      global_options_set.x_dwarf_split_debug_info = 0;
+    }
+
   /* Do not allow unwind tables to be generated by default for m32.  
      fnon-call-exceptions will override this, regardless of what we do.  */
   if (generating_for_darwin_version < 10

gcc/config/darwin.h

@@ -122,7 +122,9 @@ extern GTY(()) int darwin_ms_struct;
   "%{gfull:-g -fno-eliminate-unused-debug-symbols} %<gfull",	\
   "%{gused:-g -feliminate-unused-debug-symbols} %<gused",	\
   "%{fapple-kext|mkernel:-static}",				\
-  "%{shared:-Zdynamiclib} %<shared"
+  "%{shared:-Zdynamiclib} %<shared",                            \
+  "%{gsplit-dwarf:%ngsplit-dwarf is not supported on this platform } \
+     %<gsplit-dwarf"
 
 #define DARWIN_CC1_SPEC							\
   "%{findirect-virtual-calls: -fapple-kext} %<findirect-virtual-calls " \
@@ -421,6 +423,8 @@ extern GTY(()) int darwin_ms_struct;
    debugging data.  */
 
 #define ASM_DEBUG_SPEC  "%{g*:%{%:debug-level-gt(0):%{!gdwarf*:--gstabs}}}"
+#define ASM_FINAL_SPEC \
+  "%{gsplit-dwarf:%ngsplit-dwarf is not supported on this platform } %<gsplit-dwarf"
 
 /* We still allow output of STABS if the assembler supports it.  */
 #ifdef HAVE_AS_STABS_DIRECTIVE

gcc/testsuite/ChangeLog

+2018-08-18  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* g++.dg/debug/dwarf2/pr85302.C: Skip unsupported split DWARF
+	test on Darwin.
+	* g++.dg/debug/dwarf2/pr85302.C: Likewise.
+	* gcc.dg/lto/pr83719_0.c: Likewise.
+
 2018-08-17  Martin Sebor  <msebor@redhat.com>
 
 	PR testsuite/86996

gcc/testsuite/g++.dg/debug/dwarf2/pr85302.C

 // PR debug/85302
 // { dg-do compile }
+// { dg-skip-if "split DWARF unsupported" { *-*-darwin* } }
 // { dg-options "-std=c++11 -gsplit-dwarf -O1" }
 // { dg-additional-options "-fPIE" { target pie } }
 

gcc/testsuite/gcc.dg/lto/pr83719_0.c

 /* { dg-lto-do assemble } */
+/* { dg-skip-if "split DWARF unsupported" { *-*-darwin* } } */
 /* { dg-lto-options { { -flto -g -gsplit-dwarf } } } */
 
 /* Empty.  */

gcc/testsuite/gcc.dg/pr86064.c

 /* { dg-do compile } */
+/* { dg-skip-if "split DWARF unsupported" { *-*-darwin* } } */
 /* { dg-options "-g -O2 -fno-var-tracking-assignments -gsplit-dwarf" } */
 
 /* This used to fail with location views (implicitly) enabled, because