[Bug default/28641] unspecified indirect subtype changes.
woodard at redhat dot com
sourceware-bugzilla@sourceware.org
Wed Dec 8 20:27:10 GMT 2021
https://sourceware.org/bugzilla/show_bug.cgi?id=28641
--- Comment #8 from Ben Woodard <woodard at redhat dot com> ---
Attached a very simple reproducer:
[ben@alien libabigail-test]$ cat llvm-constness.C
int a=0;
struct X {
void foo();
void foo() const;
};
void X::foo(){
a++;
}
void X::foo() const {
a--;
}
[ben@alien libabigail-test]$ glto/bin/abidiff llvm-constness.o.gcc
llvm-constness.o.llvm
Functions changes summary: 0 Removed, 1 Changed, 0 Added function
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable
1 function with some indirect sub-type change:
[C] 'method void X::foo() const' at llvm-constness.C:5:1 has some indirect
sub-type changes:
Here is the DWARF breakdown:
gcc:
[ 72] subprogram abbrev: 10
external (flag_present) yes
name (string) "foo"
decl_file (data1) llvm-constness.C (1)
decl_line (data1) 5
decl_column (data1) 8
linkage_name (strp) "_ZNK1X3fooEv"
declaration (flag_present) yes
object_pointer (ref4) [ 82]
[ 82] formal_parameter abbrev: 2
type (ref4) [ 98]
artificial (flag_present) yes
[ 98] pointer_type abbrev: 3
byte_size (implicit_const) 8
type (ref4) [ 89]
[ 89] const_type abbrev: 1
type (ref4) [ 4d]
[ 4d] structure_type abbrev: 8
name (string) "X"
byte_size (data1) 1
decl_file (data1) llvm-constness.C (1)
decl_line (data1) 3
decl_column (data1) 8
sibling (ref4) [ 89]
clang++:
[ 60] subprogram abbrev: 5
linkage_name (strp) "_ZNK1X3fooEv"
name (strp) "foo"
decl_file (data1) llvm-constness.C (1)
decl_line (data1) 5
declaration (flag_present) yes
external (flag_present) yes
[ 6b] formal_parameter abbrev: 6
type (ref4) [ 77]
artificial (flag_present) yes
[ 77] pointer_type abbrev: 7
type (ref4) [ 7c]
[ 7c] const_type abbrev: 8
type (ref4) [ 46]
[ 46] structure_type abbrev: 4
calling_convention (data1) pass_by_value (5)
name (strp) "X"
byte_size (data1) 1
decl_file (data1) llvm-constness.C (1)
decl_line (data1) 3
Which looks pretty much the same and basically correct. I think that the first
time I looked at it I mistook the implicit_const on GCC's byte_size as the
thing that was different so there may not be a clang bug just a libabigail bug
where for some reason it doesn't pick up the fact that the this pointer is
const which seems to be the thing that indicates that the member function is
const.
--
You are receiving this mail because:
You are on the CC list for the bug.
More information about the Libabigail
mailing list