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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang integrated assembler does not handle :vararg macro arguments"
href="http://llvm.org/bugs/show_bug.cgi?id=18919">18919</a>
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<th>Summary</th>
<td>Clang integrated assembler does not handle :vararg macro arguments
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>simon.hosie@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12095" name="attach_12095" title="example assembly code (ARM).">attachment 12095</a> <a href="attachment.cgi?id=12095&action=edit" title="example assembly code (ARM).">[details]</a></span>
example assembly code (ARM).
I use an assembly macro like this:
.if cc
\zzz
.endif
.endm
.set cc,1 /* normally something complicated */
...
ifcc sub r12, r5, LSL #6
bx r12
This way I can stub out several instructions in a routine without needing to
cloud the code with lots of conditional assembly. Typically I set cc to some
macro parameter to get different variants without excessive copy-paste.
Unfortunately:
% clang --target=arm-linux-gnueabihf -integrated-as ifcc.S
ifcc.S:1:17: error: vararg is not a valid parameter qualifier for 'zzz' in
macro 'ifcc'
.macro ifcc zzz:vararg
^
ifcc.S:2:5: error: expected absolute expression
.if cc
^
ifcc.S:3:13: error: unexpected token at start of statement
\zzz
^
ifcc.S:5:6: error: unexpected '.endm' in file, no current macro definition
.endm
^
ifcc.S:12:14: error: unexpected token in argument list
ifcc sub r12, r5, LSL #6
^
While the GNU assembler sees no problems.</pre>
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