[Bug c++/37770] New: static structures initialization, undefined reference to `_0'

[amdmi3 at amdmi3 dot ru]

The bug is present with both system `gcc 4.2.1 20070719' and `gcc 4.2.5
20080702 (prerelease)' built from ports. Also present on both i386 and amd64,
althrough symptoms are different.

----- Code:
struct struct1 {
        int int1;
        int int2;
};

struct struct2 {
        struct2(const struct1 REF s) { S = s; }
        struct1 S;
};

static const struct2 arr[] = {
        struct2( (struct1){1,2} )
};

int main() {
        return arr[0].S.int1 + arr[0].S.int2;
}
-----

Symptoms:

$ g++ test.c -DREF=''
/var/tmp//ccad9L64.o(.text+0x40): In function
`__static_initialization_and_destruction_0(int, int)':
: undefined reference to `_0'
/var/tmp//ccad9L64.o(.text+0x45): In function
`__static_initialization_and_destruction_0(int, int)':
: undefined reference to `_0'
collect2: ld returned 1 exit status
$ g++ test.c -DREF='&'
$

-O2 reverses this behavior:

$ g++ -O2 test.c -DREF='&'
/var/tmp//ccPsUIZY.o(.text+0x31): In function
`__static_initialization_and_destruction_0(int, int)':
: undefined reference to `_0'
/var/tmp//ccPsUIZY.o(.text+0x3b): In function
`__static_initialization_and_destruction_0(int, int)':
: undefined reference to `_0'
collect2: ld returned 1 exit status
$ g++ -O2 test.c -DREF=''
$

On amd64 error messages are different:

$ g++ test.c -DREF=''
/var/tmp//cclgnYrV.s: Assembler messages:
/var/tmp//cclgnYrV.s:63: Error: junk `(%rip)' after expression
$ g++ test.c -DREF='&'
$ g++ -O2 test.c -DREF=''
$ g++ -O2 test.c -DREF='&'
/var/tmp//ccG5mp46.s: Assembler messages:
/var/tmp//ccG5mp46.s:31: Error: junk `(%rip)' after expression
/var/tmp//ccG5mp46.s:33: Error: junk `(%rip)' after expression
$


-- 
           Summary: static structures initialization, undefined reference to
                    `_0'
           Product: gcc
           Version: 4.2.5
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: amdmi3 at amdmi3 dot ru
 GCC build triplet: i386-portbld-freebsd7.0
  GCC host triplet: i386-portbld-freebsd7.0
GCC target triplet: i386-portbld-freebsd7.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37770