https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67664
Bug ID: 67664
Summary: [6 Regression] Duplicate AT_const_value attributes in
some c++ cases.
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: iains at gcc dot gnu.org
Target Milestone: ---
[AFAICT] between 227779 and 227800 a change was introduced that causes multiple
instances of AT_const_value to be inserted in some DIEs.
This is picked up by Darwin's dsymutil and results in wide-spread fails in the
libstdc++ test suite for both m32 and m64.
The duplicate is not detected by binutils ld, but appears to be present on a
current build of x86_64-linux-gnu.
testcase libstdc++/17_intro/freestanding.cc:
linux (r227958):
<2><398>: Abbrev Number: 25 (DW_TAG_structure_type)
<399> DW_AT_name : (indirect string, offset: 0x7be):
numeric_limits<long int>
<39d> DW_AT_byte_size : 1
<39e> DW_AT_decl_file : 8
<39f> DW_AT_decl_line : 1132
<3a1> DW_AT_sibling : <0x578>
<3><3a5>: Abbrev Number: 26 (DW_TAG_member)
<3a6> DW_AT_name : (indirect string, offset: 0x75f):
is_specialized
<3aa> DW_AT_decl_file : 8
<3ab> DW_AT_decl_line : 1134
<3ad> DW_AT_type : <0xc81>
<3b1> DW_AT_external : 1
<3b1> DW_AT_declaration : 1
<3b1> DW_AT_const_value : 1
<3b2> DW_AT_const_value : 1
<3><3b3>: Abbrev Number: 26 (DW_TAG_member)
<3b4> DW_AT_name : (indirect string, offset: 0x503): digits
<3b8> DW_AT_decl_file : 8
<3b9> DW_AT_decl_line : 1147
<3bb> DW_AT_type : <0x8dd>
<3bf> DW_AT_external : 1
<3bf> DW_AT_declaration : 1
<3bf> DW_AT_const_value : 63
<3c0> DW_AT_const_value : 63
<3><3c1>: Abbrev Number: 26 (DW_TAG_member)
======
Darwin (r227952):
0x000003ff: TAG_structure_type [14] *
AT_name( "numeric_limits<long int>" )
AT_byte_size( 0x01 )
AT_decl_file(
"/Volumes/Data0/gcc-trunk/libstdc++-v3/include/std/limits" )
AT_decl_line( 1132 )
AT_sibling( {0x00000835} )
0x00000421: TAG_member [15]
AT_name( "is_specialized" )
AT_decl_file(
"/Volumes/Data0/gcc-trunk/libstdc++-v3/include/std/limits" )
AT_decl_line( 1134 )
AT_type( {0x000003c8} ( const bool ) )
AT_external( 0x01 )
AT_declaration( 0x01 )
AT_const_value( 0x01 )
AT_const_value( 0x01 )
0x0000043c: TAG_member [15]
AT_name( "digits" )
AT_decl_file(
"/Volumes/Data0/gcc-trunk/libstdc++-v3/include/std/limits" )
AT_decl_line( 1147 )
AT_type( {0x000003cd} ( const int ) )
AT_external( 0x01 )
AT_declaration( 0x01 )
AT_const_value( 0x1f )
AT_const_value( 0x1f )
