[LLVMdev] Debug info failing in assembler.

[Eric Christopher]

Interesting. File please? Thanks.
On Sep 21, 2013 6:01 AM, "Richard Pennington" <rich at pennware.com> wrote:

> Hi,
>
> I just updated from r190763 to r191137 and started getting failures in
> generated assembly language when debug info is enabled. Here is the test
> case:
>
> // Compile and run for every target.
> // RUN: %ecc -g -o %t %s && %t
> // FAIL: %armecc -g -o %t %s && %armrun %t
> // FAIL: %armebecc -g -o %t %s && %armebrun %t
> // RUN: %i386ecc -g -o %t %s && %i386run %t
> // FAIL: %microblazeecc -g -o %t %s && %microblazerun %t
> // FAIL: %mipsecc -g -o %t %s && %mipsrun %t
> // FAIL: %mipselecc -g -o %t %s && %mipselrun %t
> // FAIL: %ppcecc -g -o %t %s && %ppcrun %t
> // FAIL: %ppc64ecc -g -o %t %s && %ppc64run %t
> // RUN: %x86_64ecc -g -o %t %s && %x86_64run %t
>
> int comm;
> int main()
> {
>     comm = 6;
> }
>
> This fails on all but the x86 processors. The typical failure looks like
> this:
> ...
>         .type   comm, at object            # @comm
>         .comm   comm,4,4
>         .cfi_sections .debug_frame
>         .bss
> .L.bss_end:
> ...
> .L.debug_abbrev_end:
>         .section        .debug_aranges,"", at progbits
>         .long   36                      # Length of ARange Set
>         .short  2                       # DWARF Arange version number
>         .long   .L.debug_info_begin0    # Offset Into Debug Info Section
>         .byte   4                       # Address Size (in bytes)
>         .byte   0                       # Segment Size (in bytes)
>         .byte   255
>         .byte   255
>         .byte   255
>         .byte   255
>         .long   comm
> .Lset0 = .L.bss_end-comm
>         .long   .Lset0
>
> The typical error message is:
> /tmp/debug-8ecf9d.s: Assembler messages:
> /tmp/debug-8ecf9d.s: Error: invalid operands (.bss and *COM* sections) for
> `-' when setting `.Lset0'
>
> Is it legal to mix .comm symbols and .bss symbols in assembly? Is the x86
> success a bug or a feature?
>
> -Rich
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