http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56123
Bug #: 56123
Summary: Union bitfield corruption
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: t...@gtk.org
Created attachment 29287
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29287
test case with assertion triggered
In this union
union {
size_t vsize;
struct {
uint field24 : 24;
uint unused : 24;
uint field16 : 16;
};
};
"field16" accesses are mismangled, depending on wether "unused" has 24 bits or
is split into two 8+16 components.
Test case is attached, test it with and without -DNOBUG.
Occours on a 64bit platform with g++-4.6 and 4.7:
$ g++-4.7 --version
g++-4.7 (Ubuntu/Linaro 4.7.2-11precise2) 4.7.2
$ uname -a
Linux jumper 3.2.0-36-generic #57-Ubuntu SMP Tue Jan 8 21:44:52 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
