https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89942
Bug ID: 89942
Summary: std::function __is_location_invariant breaks ABI
compatibility
Product: gcc
Version: 5.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: kan.liu.229 at gmail dot com
Target Milestone: ---
Created attachment 46079
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46079&action=edit
possible fix
in gcc 5.4.0
template<typename _Tp>
struct __is_location_invariant
: is_trivially_copyable<_Tp>::type
{ };
__is_location_invariant is evaluated to be true for the closure type (lambda
expression)
in gcc 4.9.2
template<typename _Tp>
struct __is_location_invariant
: integral_constant<bool, (is_pointer<_Tp>::value
|| is_member_pointer<_Tp>::value)>
{ };
which is evaluated to be false.
This may break ABI compatibility when pass function object between libs
compiled by 4.9.2 / 5.4.0 gcc.
The attachment is a possible fix.
