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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Revisit how we handle conflicts with section symbols"
href="https://llvm.org/bugs/show_bug.cgi?id=31850">31850</a>
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<th>Summary</th>
<td>Revisit how we handle conflicts with section symbols
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>MC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The gnu assembler rejects
.section foo,"a",@progbits
foo:
.data
.quad foo
and accepts
foo:
.section foo,"a",@progbits
.data
.quad foo
producing a relocation with the section foo.
clang accepts both and produces relocations with the symbol.
The gas behaviour really doesn't seem intentional. There is no good reason to
prefer a section name over another symbol or vice versa.
The current clang behaviour was implemented in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - section / global name conflict: error in backend: symbol 'xxx' is already defined"
href="show_bug.cgi?id=26941">bug 26941</a>, but I think the
diagnostic there is incorrect. The only reason gcc accepts
int xxx;
__attribute__((section("xxx"))) int f() { return xxx; }
is that gcc print ".comm xxx" before ".section xxx". The gnu assembler rejects
the current clang produced .s.
What <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - section / global name conflict: error in backend: symbol 'xxx' is already defined"
href="show_bug.cgi?id=26941">bug 26941</a> is really about is a IR linker bug. From <a href="show_bug.cgi?id=31850#c5">comment 5</a> we see that
the section is from one file and the symbol from another. Just like with any
other local symbol, the IR linker should detect that it conflicts with a symbol
(the section symbol) in another module and rename it.
And I think MC should just reject both cases listed in this bug.</pre>
</div>
</p>
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