PR debug/38757 gcc does not emit DW_LANG_C99.

For C and C++ add the language standard version in use to lang_hooks.name.
Change users of lang_hook.name to check with new functions lang_GNU_C or
lang_GNU_CXX. In dwarf2out.c output the DW_LANG_C version from the
lang_hooks.name and merge any LTO TRANSLATION_UNIT_LANGUAGE found. Adds
two testcases to dwarf2.exp to check the right DWARF DW_AT_language is set
on the compile_unit depending on the -std=c89 or -std=c99 setting.

gcc/c-family/ChangeLog

	PR debug/38757
	* c-opts.c (set_std_c89): Set lang_hooks.name.
	(set_std_c99): Likewise.
	(set_std_c11): Likewise.
	(set_std_cxx98): Likewise.
	(set_std_cxx11): Likewise.
	(set_std_cxx14): Likewise.
	(set_std_cxx1z): Likewise.

gcc/ChangeLog

	PR debug/38757
	* config/avr/avr-c.c (avr_cpu_cpp_builtins): Use lang_GNU_C.
	* config/darwin.c (darwin_file_end): Use lang_GNU_CXX.
	(darwin_override_options): Likewise.
	* config/ia64/ia64.c (ia64_struct_retval_addr_is_first_parm_p):
	Likewise.
	* config/rs6000/rs6000.c (rs6000_output_function_epilogue):
	Likewise.
	* dbxout.c (get_lang_number): Likewise.
	(dbxout_type): Likewise.
	(dbxout_symbol_location): Likewise.
	* dwarf2out.c (add_prototyped_attribute): Add DW_AT_prototype
	also for DW_LANG_{C,C99,ObjC}.
	(highest_c_language): New function.
	(gen_compile_unit_die): Call highest_c_language to merge LTO
	TRANSLATION_UNIT_LANGUAGE. Use strncmp language_string to
	determine if DW_LANG_C99 or DW_LANG_C89 should be returned.
	* fold-const.c (fold_cond_expr_with_comparison): Use lang_GNU_CXX.
	* langhooks.h (struct lang_hooks): Add version comment to name.
	(lang_GNU_C): New function declaration.
	(lang_GNU_CXX): Likewise.
	* langhooks.c (lang_GNU_C): New function.
	(lang_GNU_CXX): Likewise.
	* vmsdbgout.c (vmsdbgout_init): Use lang_GNU_C and lang_GNU_CXX.

gcc/testsuite/ChangeLog

	PR debug/38757
	* gcc.dg/debug/dwarf2/lang-c89.c: New test.
	* gcc.dg/debug/dwarf2/lang-c99.c: Likewise.

From-SVN: r217934

4 files changed, 6 insertions, 6 deletions

diff --git a/gcc/config/avr/avr-c.c b/gcc/config/avr/avr-c.c
index 13ece98..324afb3 100644
--- a/gcc/config/avr/avr-c.c
+++ b/gcc/config/avr/avr-c.c
@@ -386,7 +386,7 @@ avr_cpu_cpp_builtins (struct cpp_reader *pfile)
      (as mentioned in ISO/IEC DTR 18037; Annex F.2) which is not
      implemented in GCC up to now.  */
 
-  if (!strcmp (lang_hooks.name, "GNU C"))
+  if (lang_GNU_C ())
     {
       for (i = 0; i < ADDR_SPACE_COUNT; i++)
         if (!ADDR_SPACE_GENERIC_P (i)
diff --git a/gcc/config/darwin.c b/gcc/config/darwin.c
index a201a74..1785e85 100644
--- a/gcc/config/darwin.c
+++ b/gcc/config/darwin.c
@@ -2909,7 +2909,7 @@ darwin_file_end (void)
      }
 
   machopic_finish (asm_out_file);
-  if (strcmp (lang_hooks.name, "GNU C++") == 0)
+  if (lang_GNU_CXX ())
     {
       switch_to_section (darwin_sections[constructor_section]);
       switch_to_section (darwin_sections[destructor_section]);
@@ -3162,7 +3162,7 @@ darwin_override_options (void)
   if (flag_mkernel || flag_apple_kext)
     {
       /* -mkernel implies -fapple-kext for C++ */
-      if (strcmp (lang_hooks.name, "GNU C++") == 0)
+      if (lang_GNU_CXX ())
 	flag_apple_kext = 1;
 
       flag_no_common = 1;
diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 860b658..73d3289 100644
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -10772,7 +10772,7 @@ ia64_struct_retval_addr_is_first_parm_p (tree fntype)
 	  && ret_type
 	  && TYPE_MODE (ret_type) == BLKmode 
 	  && TREE_ADDRESSABLE (ret_type)
-	  && strcmp (lang_hooks.name, "GNU C++") == 0);
+	  && lang_GNU_CXX ());
 }
 
 /* Output the assembler code for a thunk function.  THUNK_DECL is the
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 264598e..ea3e511 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -25431,7 +25431,7 @@ rs6000_output_function_epilogue (FILE *file,
 	 Java is 13.  Objective-C is 14.  Objective-C++ isn't assigned
 	 a number, so for now use 9.  LTO and Go aren't assigned numbers
 	 either, so for now use 0.  */
-      if (! strcmp (language_string, "GNU C")
+      if (lang_GNU_C ()
 	  || ! strcmp (language_string, "GNU GIMPLE")
 	  || ! strcmp (language_string, "GNU Go"))
 	i = 0;
@@ -25442,7 +25442,7 @@ rs6000_output_function_epilogue (FILE *file,
 	i = 2;
       else if (! strcmp (language_string, "GNU Ada"))
 	i = 3;
-      else if (! strcmp (language_string, "GNU C++")
+      else if (lang_GNU_CXX ()
 	       || ! strcmp (language_string, "GNU Objective-C++"))
 	i = 9;
       else if (! strcmp (language_string, "GNU Java"))