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Add experimental (minimal) DWARFv5 support. This change depends on the new DWARFv5 constants mentioned in the following draft: http://dwarfstd.org/doc/dwarf5.20141029.pdf gcc/ChangeLog * doc/invoke.texi (-gdwarf-@{version}): Mention experimental DWARFv5. * opts.c (common_handle_option): Accept -gdwarf-5. * dwarf2out.c (is_cxx): Add DW_LANG_C_plus_plus_11 and DW_LANG_C_plus_plus_14. (lower_bound_default): Likewise. Plus DW_LANG_C11. (gen_compile_unit_die): Output DW_LANG_C_plus_plus_11, DW_LANG_C_plus_plus_14 or DW_LANG_C11. (output_compilation_unit_header): Output at most a DWARFv4 header. (output_skeleton_debug_sections): Likewise. (output_line_info): Likewise. (output_aranges): Document header version number. gcc/testsuite/ChangeLog * gcc.dg/debug/dwarf2/lang-c11.c: New test. * gcc.dg/debug/dwarf2/lang-c11-d4-strict.c: Likewise. * g++.dg/debug/dwarf2/lang-cpp11.C: Likewise. * g++.dg/debug/dwarf2/lang-cpp14.C: Likewise. * g++.dg/debug/dwarf2/lang-cpp98.C: Likewise. include/ChangeLog * dwarf2.h: Add DW_LANG_C_plus_plus_11, DW_LANG_C11 and DW_LANG_C_plus_plus_14. From-SVN: r218077
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