[Bug c/27945] New: Packed struct of variable length has wrong size

[alpt at freaknet dot org]

Consider this test: http://hinezumilabs.org/alpt/test-pack.c

#define _PACKED_ __attribute__ ((__packed__))
int func(int levels) 
{
        struct foo {
                u_char          a;
                int32_t         b[levels];
                struct timeval _PACKED_ c[levels];
                u_int           d[4];
        }_PACKED_ pkt;

        struct bar {
                u_char          a;
                int32_t         b[levels];
                struct timeval  c[levels];
                u_int           d[4];
        }_PACKED_ pktII;

        printf("pkt %d, foo %d\n", sizeof(pkt), sizeof(struct foo));
        printf("pktII %d, bar %d\n", sizeof(pktII), sizeof(struct bar));
}

On a x86 with gcc-3.4.x/3.3.6 it prints:
pkt 65, foo 65
pktII 65, bar 65
(this is the right output)

while compiled for mips and runned on a BCM3302 (mips) with a gcc-3.4.4
it gives:
pkt 68, foo 68
pktII 68, bar 68

On a gentoo's 4.1.1 amd64:
pkt 104, foo 104
pktII 104, bar 104

On a x86 with the same version of gcc:
pkt 68, foo 68
pktII 68, bar 68

That's all ;)


-- 
           Summary: Packed struct of variable length has wrong size
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: alpt at freaknet dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27945