https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68098
Bug ID: 68098
Summary: Function multiversioning causes segfaults when used
for member functions
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: egor.kochetov at intel dot com
Target Milestone: ---
Here is the source that triggers runtime segmentation fault when compiled by
`g++` versions 4.9 through 6.0 trunk.
#include <cstdio>
class Foo {
public:
/* Default version of foo. */
__attribute__ ((target("default")))
int foo () { return 0; }
/* SSSE3 version of foo. */
__attribute__ ((target("ssse3")))
int foo () { return 0; }
};
int main () {
Foo f;
typedef int (Foo::* funcptr)();
funcptr fp = &Foo::foo;
j = (f.*fp)(); //< segfault here
// f.foo(); //< works as expected
printf ("all good\n");
return 0;
}
The problem occurs only if the version function is accessed by a
member-function ponter, direct function call works as expected.
Compilation and target platforms are Linux 64 bit, -O0 throug -Ofast, -m32 or
-m64.
