[Bug debug/38757] gcc does not emit DW_LANG_C99

[mark at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38757

--- Comment #7 from Mark Wielaard <mark at gcc dot gnu.org> ---
Author: mark
Date: Fri Nov 21 16:00:06 2014
New Revision: 217934

URL: https://gcc.gnu.org/viewcvs?rev=217934&root=gcc&view=rev
Log:
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.

Added:
    trunk/gcc/testsuite/gcc.dg/debug/dwarf2/lang-c89.c
    trunk/gcc/testsuite/gcc.dg/debug/dwarf2/lang-c99.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-opts.c
    trunk/gcc/config/avr/avr-c.c
    trunk/gcc/config/darwin.c
    trunk/gcc/config/ia64/ia64.c
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/dbxout.c
    trunk/gcc/dwarf2out.c
    trunk/gcc/fold-const.c
    trunk/gcc/langhooks.c
    trunk/gcc/langhooks.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/vmsdbgout.c