[LLVMbugs] [Bug 17321] New: Debug information causes assembly errors.

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Sep 21 18:23:45 PDT 2013


            Bug ID: 17321
           Summary: Debug information causes assembly errors.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: rich at pennware.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

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
        .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'

I am using binutils 2.23.1.

Apparently the x86 assemblers are the only ones that allow a .bss - .comm
symbol subtraction. ARM, Microblaze, Mips, and PowerPC all fail.

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