ec99905f7b
DWARF has voted in recently https://dwarfstd.org/issues/241209.1.html , which is basically just a guarantee that the DWARF 6 draft DW_AT_language_{name,version} attribute codes and content of https://dwarfstd.org/languages-v6.html can be used as an extension in DWARF 5 and won't be changed. So, this patch is an alternative to the https://gcc.gnu.org/pipermail/gcc-patches/2024-November/669671.html patch, which had the major problem that it required changing all the DWARF consumers to be able to debug C17 or later or C++17 or later sources. This patch uses still DWARF 5 DW_LANG_C11 or DW_LANG_C_plus_plus_14, the latest code in DWARF 5 proper, so all DWARF 5 capable consumers should be able to deal with that, but additionally emits the DWARF 6 attributes so that newer DWARF consumers can see it isn't just C++14 but say C++23 or C11 but C23. Consumers which don't know those DWARF 6 attributes would just ignore them. This is like any other -gno-strict-dwarf extension, except that normally we emit say DWARF 5 codes where possible only after DWARF 5 is released, while in this case there is a guarantee it can be used before DWARF 6 is released. 2025-01-08 Jakub Jelinek <jakub@redhat.com> include/ * dwarf2.h (enum dwarf_source_language): Fix comment pasto. (enum dwarf_source_language_name): New type. * dwarf2.def (DW_AT_language_name, DW_AT_language_version): New DWARF 6 codes. gcc/ * dwarf2out.cc (break_out_comdat_types): Copy over DW_AT_language_{name,version} if present. (output_skeleton_debug_sections): Remove also DW_AT_language_{name,version}. (gen_compile_unit_die): For C17, C23, C2Y, C++17, C++20, C++23 and C++26 emit for -gdwarf-5 -gno-strict-dwarf also DW_AT_language_{name,version} attributes. gcc/testsuite/ * g++.dg/debug/dwarf2/lang-cpp17.C: Add -gno-strict-dwarf to dg-options. Check also for DW_AT_language_{name,version} values. * g++.dg/debug/dwarf2/lang-cpp20.C: Likewise. * g++.dg/debug/dwarf2/lang-cpp23.C: New test. |
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