Only support -gstabs on Mac OS X if assember supports it (PR target/67973)

	gcc:
	PR target/67973
	* configure.ac (gcc_cv_as_stabs_directive): New test.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/darwin.h (DBX_DEBUGGING_INFO): Wrap in
	HAVE_AS_STABS_DIRECTIVE.
	(PREFERRED_DEBUGGING_TYPE): Likewise.
	* config/i386/darwin.h (PREFERRED_DEBUGGING_TYPE): Only include
	DBX_DEBUG if HAVE_AS_STABS_DIRECTIVE.

	* doc/sourcebuild.texi (Effective-Target Keywords, Environment
	attributes): Document stabs.

	gcc/testsuite:
	PR target/67973
	* lib/target-supports.exp (check_effective_target_stabs): New
	proc.
	* g++.dg/cpp0x/alias-decl-debug-0.C: Restrict to stabs targets.
	* g++.dg/other/PR23205.C: Likewise.
	* g++.dg/other/pr23205-2.C: Likewise.
	* gcc.dg/20040813-1.c: Likewise.
	* gcc.dg/darwin-20040809-2.c: Likewise.
	* objc.dg/stabs-1.m: Likewise.

From-SVN: r231747

gcc/ChangeLog

+2015-12-17  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR target/67973
+	* configure.ac (gcc_cv_as_stabs_directive): New test.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+	* config/darwin.h (DBX_DEBUGGING_INFO): Wrap in
+	HAVE_AS_STABS_DIRECTIVE.
+	(PREFERRED_DEBUGGING_TYPE): Likewise.
+	* config/i386/darwin.h (PREFERRED_DEBUGGING_TYPE): Only include
+	DBX_DEBUG if HAVE_AS_STABS_DIRECTIVE.
+
+	* doc/sourcebuild.texi (Effective-Target Keywords, Environment
+	attributes): Document stabs.
+
 2015-12-16  Martin Sebor  <msebor@redhat.com>
 
 	PR c/68868

gcc/config.in

@@ -636,6 +636,12 @@
 #endif
 
 
+/* Define if your assembler supports .stabs. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_STABS_DIRECTIVE
+#endif
+
+
 /* Define if your assembler and linker support thread-local storage. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_TLS

gcc/config/darwin.h

@@ -400,12 +400,13 @@ extern GTY(()) int darwin_ms_struct;
 
 #define ASM_DEBUG_SPEC  "%{g*:%{!g0:%{!gdwarf*:--gstabs}}}"
 
-/* We still allow output of STABS.  */
-
+/* We still allow output of STABS if the assembler supports it.  */
+#ifdef HAVE_AS_STABS_DIRECTIVE
 #define DBX_DEBUGGING_INFO 1
+#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
+#endif
 
 #define DWARF2_DEBUGGING_INFO 1
-#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 
 #define DEBUG_FRAME_SECTION	"__DWARF,__debug_frame,regular,debug"
 #define DEBUG_INFO_SECTION	"__DWARF,__debug_info,regular,debug"

gcc/config/i386/darwin.h

@@ -226,7 +226,11 @@ do {									\
    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 #ifndef DARWIN_PREFER_DWARF
 #undef PREFERRED_DEBUGGING_TYPE
+#ifdef HAVE_AS_STABS_DIRECTIVE
 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
+#else
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
+#endif
 #endif
 
 /* Darwin uses the standard DWARF register numbers but the default

gcc/configure

@@ -23519,6 +23519,37 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for stabs directive" >&5
+$as_echo_n "checking assembler for stabs directive... " >&6; }
+if test "${gcc_cv_as_stabs_directive+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  gcc_cv_as_stabs_directive=no
+  if test x$gcc_cv_as != x; then
+    $as_echo '.stabs "gcc2_compiled.",60,0,0,0' > conftest.s
+    if { ac_try='$gcc_cv_as $gcc_cv_as_flags  -o conftest.o conftest.s >&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+	gcc_cv_as_stabs_directive=yes
+    else
+      echo "configure: failed program was" >&5
+      cat conftest.s >&5
+    fi
+    rm -f conftest.o conftest.s
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_stabs_directive" >&5
+$as_echo "$gcc_cv_as_stabs_directive" >&6; }
+if test $gcc_cv_as_stabs_directive = yes; then
+
+$as_echo "#define HAVE_AS_STABS_DIRECTIVE 1" >>confdefs.h
+
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for COMDAT group support (GNU as)" >&5
 $as_echo_n "checking assembler for COMDAT group support (GNU as)... " >&6; }
 if test "${gcc_cv_as_comdat_group+set}" = set; then :

gcc/configure.ac

@@ -2909,6 +2909,11 @@ AC_DEFINE_UNQUOTED(HAVE_GAS_SHF_MERGE,
   [`if test $gcc_cv_as_shf_merge = yes; then echo 1; else echo 0; fi`],
 [Define 0/1 if your assembler supports marking sections with SHF_MERGE flag.])
 
+gcc_GAS_CHECK_FEATURE([stabs directive], gcc_cv_as_stabs_directive, ,,
+[.stabs "gcc2_compiled.",60,0,0,0],,
+[AC_DEFINE(HAVE_AS_STABS_DIRECTIVE, 1,
+  [Define if your assembler supports .stabs.])])
+
 gcc_GAS_CHECK_FEATURE([COMDAT group support (GNU as)],
  gcc_cv_as_comdat_group,
  [elf,2,16,0], [--fatal-warnings],

gcc/doc/sourcebuild.texi

@@ -1833,6 +1833,9 @@ time) should be run on this target.  This can be enabled by setting the
 Test system runs executables on a simulator (i.e. slowly) rather than
 hardware (i.e. fast).
 
+@item stabs
+Target supports the stabs debugging format.
+
 @item stdint_types
 Target has the basic signed and unsigned C types in @code{stdint.h}.
 This will be obsolete when GCC ensures a working @code{stdint.h} for

gcc/testsuite/ChangeLog

+2015-12-17  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR target/67973
+	* lib/target-supports.exp (check_effective_target_stabs): New
+	proc.
+	* g++.dg/cpp0x/alias-decl-debug-0.C: Restrict to stabs targets.
+	* g++.dg/other/PR23205.C: Likewise.
+	* g++.dg/other/pr23205-2.C: Likewise.
+	* gcc.dg/20040813-1.c: Likewise.
+	* gcc.dg/darwin-20040809-2.c: Likewise.
+	* objc.dg/stabs-1.m: Likewise.
+
 2015-12-17  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* gcc.target/arc/jump-around-jump.c (rtc_set_time): Declare.

gcc/testsuite/g++.dg/cpp0x/alias-decl-debug-0.C

 // Origin: PR c++/51032
-// { dg-do compile { target c++11 } }
-// { dg-skip-if "No stabs" { aarch64*-*-* mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* *-*-vxworks* nios2-*-* } { "*" } { "" } }
+// { dg-do compile { target { c++11 && stabs } } }
 // { dg-options "-gstabs+" }
 
 template <class C>

gcc/testsuite/g++.dg/other/PR23205.C

-/* { dg-do compile } */
-/* { dg-skip-if "No stabs" { aarch64*-*-* mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* nios2-*-* tile*-*-* *-*-vxworks } { "*" } { "" } } */
+/* { dg-do compile { target stabs } } */
 /* { dg-options "-gstabs+ -fno-eliminate-unused-debug-types" } */
 
 const int foobar = 4;

gcc/testsuite/g++.dg/other/pr23205-2.C

-/* { dg-do compile } */
-/* { dg-skip-if "No stabs" { aarch64*-*-* mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* tile*-*-* nios2-*-* } { "*" } { "" } } */
+/* { dg-do compile { target stabs } } */
 /* { dg-options "-gstabs+ -fno-eliminate-unused-debug-types -ftoplevel-reorder" } */
 
 const int foobar = 4;

gcc/testsuite/gcc.dg/20040813-1.c

 /* Test lang in N_SO stab.  */
 /* Contributed by Devang Patel  <dpatel@apple.com>  */
 
-/* { dg-do compile } */
-/* { dg-skip-if "No stabs" { aarch64*-*-* mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* tile*-*-* nios2-*-* *-*-vxworks* nvptx-*-* } { "*" } { "" } } */
+/* { dg-do compile { target stabs } } */
 /* { dg-options "-gstabs" } */
 
 int

gcc/testsuite/gcc.dg/darwin-20040809-2.c

 /* Test dead code strip support.  */
 /* Contributed by Devang Patel  <dpatel@apple.com>  */
 
-/* { dg-do compile { target *-*-darwin* } } */
+/* { dg-do compile { target { *-*-darwin* && stabs } } } */
 /* { dg-options "-gstabs+ -fno-eliminate-unused-debug-symbols" } */
 
 int

gcc/testsuite/lib/target-supports.exp

@@ -938,6 +938,15 @@ proc check_effective_target_pthread {} {
     } "-pthread"]
 }
 
+# Return 1 if compilation with -gstabs is error-free for trivial
+# code, 0 otherwise.
+
+proc check_effective_target_stabs {} {
+    return [check_no_compiler_messages stabs object {
+	void foo (void) { }
+    } "-gstabs"]
+}
+
 # Return 1 if compilation with -mpe-aligned-commons is error-free
 # for trivial code, 0 otherwise.
 

gcc/testsuite/objc.dg/stabs-1.m

 /* Check if the final SO STABS record goes into the .text section.  */
 /* Contributed by Ziemowit Laski <zlaski@apple.com> */
 
-/* { dg-do compile } */
-/* { dg-skip-if "No stabs" { mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* } { "*" } { "" } } */
+/* { dg-do compile { target stabs } } */
 /* { dg-options "-gstabs" } */
 
 @interface MyClass