[Bug target/49833] [x32] PIC doesn't work

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49833

--- Comment #19 from H.J. Lu <hjl.tools at gmail dot com> 2011-07-25 20:13:13 UTC ---
(In reply to comment #18)
> (In reply to comment #14)
> > Another problem:
> > 
> > [hjl@gnu-6 gcc]$ cat /tmp/bar.c
> > typedef unsigned int Elf32_Addr;
> > extern void _start (void);
> > int
> > dl_main ( Elf32_Addr *user_entry)
> > {
> >   if (*user_entry == (Elf32_Addr) _start)
> >     return 0;
> >   else
> >     return 1;
> > }
> > [hjl@gnu-6 gcc]$ ./xgcc -B./ -S -O2 -fPIC /tmp/bar.c   -mx32 -std=gnu99  -dp
> > /tmp/bar.c: In function âdl_mainâ:
> > /tmp/bar.c:10:1: error: unrecognizable insn:
> > (insn 6 5 7 3 (set (reg:SI 67)
> >         (symbol_ref:SI ("_start") [flags 0x41] <function_decl 0x7faad972ff00
> > _start>)) /tmp/bar.c:6 -1
> >      (nil))
> > /tmp/bar.c:10:1: internal compiler error: in extract_insn, at recog.c:2115
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > See <http://gcc.gnu.org/bugs.html> for instructions.
> > [hjl@gnu-6 gcc]$
> 
> On x32 branch, I got
> 
>     .file    "bar.c"
>     .text
>     .p2align 4,,15
>     .globl    dl_main
>     .type    dl_main, @function
> dl_main:
> .LFB0:
>     .cfi_startproc
>     movl    _start@GOTPCREL(%rip), %eax    # 22    *movsi_internal/1    [length
> = 6]
>     cmpl    %eax, (%rdi)    # 8    *cmpsi_1/1    [length = 2]
>     setne    %al    # 23    *setcc_qi    [length = 3]
>     movzbl    %al, %eax    # 24    *zero_extendqisi2_movzbl    [length = 3]
>     ret    # 27    return_internal    [length = 1]
>     .cfi_endproc
> .LFE0:
>     .size    dl_main, .-dl_main
>     .ident    "GCC: (GNU) 4.7.0 20110723 (experimental)"
>     .section    .note.GNU-stack,"",@progbits

I have a patch for this.