[Bug c++/42330] New: undefined reference to "static const int" in class when passing as "const int &" to a function

[aijunbai at gmail dot com]

consider the flowing code:

struct A {
    static const int i = 0;
};

void foo(int)
{
}

void bar(const int &)
{
}

int main() {
    foo(A::i);
    bar(A::i);

    return 0;
}

when compiling with -O0 option, g++ reports that: undefined reference to
`A::i',
but it will be ok if i use -O3 option.

gcc -v says:
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-4ubuntu8'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu8)


-- 
           Summary: undefined reference to "static const int" in class when
                    passing as "const int &" to a function
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: aijunbai at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42330