diff options
Diffstat (limited to 'gcc/dwarf2out.c')
| -rw-r--r-- | gcc/dwarf2out.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c index d3b268a..19f7f65 100644 --- a/gcc/dwarf2out.c +++ b/gcc/dwarf2out.c @@ -18272,6 +18272,23 @@ add_data_member_location_attribute (dw_die_ref die, if (! loc_descr) { + /* While DW_AT_data_bit_offset has been added already in DWARF4, + e.g. GDB only added support to it in November 2016. For DWARF5 + we need newer debug info consumers anyway. We might change this + to dwarf_version >= 4 once most consumers catched up. */ + if (dwarf_version >= 5 + && TREE_CODE (decl) == FIELD_DECL + && DECL_BIT_FIELD_TYPE (decl)) + { + tree off = bit_position (decl); + if (tree_fits_uhwi_p (off) && get_AT (die, DW_AT_bit_size)) + { + remove_AT (die, DW_AT_byte_size); + remove_AT (die, DW_AT_bit_offset); + add_AT_unsigned (die, DW_AT_data_bit_offset, tree_to_uhwi (off)); + return; + } + } if (dwarf_version > 2) { /* Don't need to output a location expression, just the constant. */ |