I wrote the following code.
------ begin file haha.cc ---------------
struct C {
int i;
};
template <typename T>
struct A {
A() : p(&C::i) {}
int C::*p;
};
const A<int> r;
int main()
{
return 0;
}
------------ end file haha.cc -----------------
And I compiled it with -O2 switch. The exact compilation command given was:
$ g++ -O2 -Wall haha.cc
The compiler didn't produce any errors nor warnings. But when I ran the
generated binary, 'Segmentation fault' came up.
If you (1) make struct A a non-template class or (2) define r as non-const or
(3) declare A::p as a normal pointer or (4) don't give -O2 switch, it compiles
and runs well.
The following is the output from 'gcc -v' command:
$ gcc -v
Reading specs from /usr/lib/gcc/x86_64-redhat-linux/3.4.6/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-java-awt=gtk --host=x86_64-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)
--
Summary: initialization failure of global const variable of
template class which has a constructor initializing its
member which is a pointer to member data when compiled
with -O2
Product: gcc
Version: 3.4.6
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: kyusic at gmail dot com
GCC build triplet: x86_64-redhat-linux
GCC host triplet: x86_64-redhat-linux
GCC target triplet: x86_64-redhat-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41384
