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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Find the "best" order for local symbols"
href="https://bugs.llvm.org/show_bug.cgi?id=36716">36716</a>
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<th>Summary</th>
<td>Find the "best" order for local symbols
</td>
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<th>Product</th>
<td>lld
</td>
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<th>Version</th>
<td>unspecified
</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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>ELF
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>rafael@espindo.la
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>There is an interesting discussion at <a href="mailto:generic-abi@googlegroups.com">generic-abi@googlegroups.com</a> about the
order of local symbols.
The ELF spec doesn't say anything about it, so we can try to figure out what is
the most convenient for linkers and consumers
Linking
----------------------------------
.file "file1"
local1:
.global hidden1
.hidden hidden1
hidden1:
---------------------------------
And
---------------------------------
.file "file2"
local2:
.global hidden2
.hidden hidden2
hidden2:
--------------------------------
The results are
lld: local1, local2, hidden1, hidden2
bfd: file1, corrupted file2?, hidden1, hidden2
gold: file1, local1, file2, local2, hidden1, hidden2
Gold's output has the advantage that one can map the original local symbols to
a file. The exception being that the hidden symbols show up as being from file2
(one can still check the visibility to tell the difference).
Two orders that might be ever better are
* hidden1, hidden2, file1, local2, file2, local2
* file1, local1, hidden1, file2, local2, hidden2
The first one has the advantage of making it easy to find out the file of local
symbols.
The second one has the advantage of specifying where the hidden symbols came
from.</pre>
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