Fix PR12616 - gdb does not implement DW_AT_data_bit_offset
authorAndreas Arnez <arnez@linux.vnet.ibm.com>
Thu, 24 Nov 2016 16:48:03 +0000 (17:48 +0100)
committerAndreas Arnez <arnez@linux.vnet.ibm.com>
Thu, 24 Nov 2016 16:48:03 +0000 (17:48 +0100)
commitda5b30da2d1167591aa8d71b543f97bfdc2ec2a2
tree02b8642e03532bfd81e14658ccf016b1e2dfa428
parent1dcb9720d62cd053a72c31881b7724ce9f74332c
Fix PR12616 - gdb does not implement DW_AT_data_bit_offset

The DW_AT_data_bit_offset attribute was introduced by DWARF V4 and
allows specifying the offset of a data member within its containing
entity.  But although the new attribute was intended to replace
DW_AT_bit_offset for this purpose, GDB ignores it, and thus GCC still
emits DW_AT_bit_offset instead.  See also
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71669.

This change fixes GDB's lack of support for DW_AT_data_bit_offset and
adds an appropriate test case.

gdb/ChangeLog:

PR gdb/12616
* dwarf2read.c (dwarf2_add_field): Handle the DWARF V4 attribute
DW_AT_data_bit_offset.

gdb/testsuite/ChangeLog:

PR gdb/12616
* gdb.dwarf2/nonvar-access.exp: New testcase.  Check that GDB
respects the DW_AT_data_bit_offset attribute.
gdb/ChangeLog
gdb/dwarf2read.c
gdb/testsuite/ChangeLog
gdb/testsuite/gdb.dwarf2/nonvar-access.exp [new file with mode: 0644]