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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@217934 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 0 deletions

diff --git a/gcc/c-family/c-opts.c b/gcc/c-family/c-opts.c
index 000fdd2bd52..08a36f03c8c 100644
--- a/gcc/c-family/c-opts.c
+++ b/gcc/c-family/c-opts.c
@@ -1450,6 +1450,7 @@ set_std_c89 (int c94, int iso)
   flag_isoc94 = c94;
   flag_isoc99 = 0;
   flag_isoc11 = 0;
+  lang_hooks.name = "GNU C89";
 }
 
 /* Set the C 99 standard (without GNU extensions if ISO).  */
@@ -1463,6 +1464,7 @@ set_std_c99 (int iso)
   flag_isoc11 = 0;
   flag_isoc99 = 1;
   flag_isoc94 = 1;
+  lang_hooks.name = "GNU C99";
 }
 
 /* Set the C 11 standard (without GNU extensions if ISO).  */
@@ -1476,6 +1478,7 @@ set_std_c11 (int iso)
   flag_isoc11 = 1;
   flag_isoc99 = 1;
   flag_isoc94 = 1;
+  lang_hooks.name = "GNU C11";
 }
 
 /* Set the C++ 98 standard (without GNU extensions if ISO).  */
@@ -1487,6 +1490,7 @@ set_std_cxx98 (int iso)
   flag_no_nonansi_builtin = iso;
   flag_iso = iso;
   cxx_dialect = cxx98;
+  lang_hooks.name = "GNU C++98";
 }
 
 /* Set the C++ 2011 standard (without GNU extensions if ISO).  */
@@ -1501,6 +1505,7 @@ set_std_cxx11 (int iso)
   flag_isoc94 = 1;
   flag_isoc99 = 1;
   cxx_dialect = cxx11;
+  lang_hooks.name = "GNU C++11";
 }
 
 /* Set the C++ 2014 draft standard (without GNU extensions if ISO).  */
@@ -1515,6 +1520,7 @@ set_std_cxx14 (int iso)
   flag_isoc94 = 1;
   flag_isoc99 = 1;
   cxx_dialect = cxx14;
+  lang_hooks.name = "GNU C++14";
 }
 
 /* Set the C++ 201z draft standard (without GNU extensions if ISO).  */
@@ -1530,6 +1536,7 @@ set_std_cxx1z (int iso)
   flag_isoc99 = 1;
   flag_isoc11 = 1;
   cxx_dialect = cxx1z;
+  lang_hooks.name = "GNU C++14"; /* Pretend C++14 till standarization.  */
 }
 
 /* Args to -d specify what to dump.  Silently ignore