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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Debug information causes assembly errors."
href="http://llvm.org/bugs/show_bug.cgi?id=17321">17321</a>
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<th>Summary</th>
<td>Debug information causes assembly errors.
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>rich@pennware.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<pre>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,@object # @comm
.comm comm,4,4
.cfi_sections .debug_frame
.bss
.L.bss_end:
...
.L.debug_abbrev_end:
.section .debug_aranges,"",@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.</pre>
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