[Bug c++/15231] Local variables in lambdas are not accessible

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=15231

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jan.kratochvil at redhat dot com

--- Comment #2 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
I agree the bug is due to missing PC bounds but I find the difference
elsewhere.

PASS: gcc-6.0.0-0.20.fc24.x86_64
FAIL: gcc-5.3.1-6.fc23.x86_64
Tested with gdb-7.10.1-31.fc23.x86_64 and even more recent GDBs.

GDB: read_lexical_block_scope
  /* Ignore blocks with missing or invalid low and high pc attributes.  */
[...]
  if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
    return;


PASS: gcc-6.0.0-0.20.fc24.x86_64 0x1c3->0x91->0xb7
    <c>   DW_AT_producer    : (indirect string, offset: 0xa): GNU C++11 6.0.0
20160406 (Red Hat 6.0.0-0.20) -mtune=generic -march=x86-64 -g -std=c++11
[...]
 <1><91>: Abbrev Number: 11 (DW_TAG_subprogram)
    <92>   DW_AT_specification: <0x3d>
    [...]
[...]
 <2><b7>: Abbrev Number: 15 (DW_TAG_structure_type)
    <b8>   DW_AT_name        : (indirect string, offset: 0x79): <lambda()>
    [...]
[...]
 <1><1c3>: Abbrev Number: 25 (DW_TAG_subprogram)
    <1c4>   DW_AT_abstract_origin: <0x91>
    <1c8>   DW_AT_linkage_name: (indirect string, offset: 0xbc): _ZN1ZC2Ev
    [...]

FAIL: gcc-5.3.1-6.fc23.x86_64 0x1aa->0x7b->0x92
    <c>   DW_AT_producer    : (indirect string, offset: 0x9f): GNU C++11 5.3.1
20160406 (Red Hat 5.3.1-6) -mtune=generic -march=x86-64 -g
[...]
 <1><7b>: Abbrev Number: 9 (DW_TAG_subprogram)
    <7c>   DW_AT_specification: <0x3d>
    [...]
 <2><92>: Abbrev Number: 11 (DW_TAG_lexical_block)
[...]
 <3><9c>: Abbrev Number: 13 (DW_TAG_structure_type)
    <9d>   DW_AT_name        : (indirect string, offset: 0x3c): <lambda()>
    [...]
[...]
 <1><1aa>: Abbrev Number: 25 (DW_TAG_subprogram)
    <1ab>   DW_AT_abstract_origin: <0x7b>
    <1af>   DW_AT_linkage_name: (indirect string, offset: 0x77): _ZN1ZC2Ev
    [...]

Keeping the Bug for GDB open as it could be compatible with older GCCs.

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