https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94847
Bug ID: 94847
Summary: -fdebug-types-section drops const in type
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
Consider test-case gdb/testsuite/gdb.base/constvars.c (
https://sourceware.org/git/?p=binutils-gdb.git;a=blob_plain;f=gdb/testsuite/gdb.base/constvars.c;hb=HEAD
).
Compiled with debug info:
...
$ gcc -g constvars.c
...
we have the expected:
...
$ gdb -batch a.out -ex start -ex "ptype victor"
Temporary breakpoint 1 at 0x4004f4: file constvars.c, line 24.
Temporary breakpoint 1, main () at constvars.c:24
24 char lave = 'B';
type = const volatile char
...
However, compiled with -fdebug-types-section in addition:
...
$ gcc -g -fdebug-types-section constvars.c
...
we have instead:
...
$ gdb -batch a.out -ex start -ex "ptype victor"
Temporary breakpoint 1 at 0x4004f4: file constvars.c, line 24.
Temporary breakpoint 1, main () at constvars.c:24
24 char lave = 'B';
type = volatile char
...
So, the 'const' got dropped.
Looking at the debug info, in the first case we have:
...
<2><64b>: Abbrev Number: 3 (DW_TAG_variable)
<64c> DW_AT_name : victor
<652> DW_AT_type : <0x826>
<1><826>: Abbrev Number: 8 (DW_TAG_const_type)
<827> DW_AT_type : <0x821>
<1><821>: Abbrev Number: 9 (DW_TAG_volatile_type)
<822> DW_AT_type : <0x815>
<1><815>: Abbrev Number: 10 (DW_TAG_base_type)
<816> DW_AT_byte_size : 1
<817> DW_AT_encoding : 6 (signed char)
<818> DW_AT_name : char
...
but in the second case we have:
...
<2><64b>: Abbrev Number: 3 (DW_TAG_variable)
<64c> DW_AT_name : victor
<652> DW_AT_type : <0x821>
<1><821>: Abbrev Number: 9 (DW_TAG_volatile_type)
<822> DW_AT_type : <0x815>
<1><815>: Abbrev Number: 10 (DW_TAG_base_type)
<816> DW_AT_byte_size : 1
<817> DW_AT_encoding : 6 (signed char)
<818> DW_AT_name : char
...
