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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - PROVIDE script variable defined if only referenced via other PROVIDE"
href="https://bugs.llvm.org/show_bug.cgi?id=38948">38948</a>
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<th>Summary</th>
<td>PROVIDE script variable defined if only referenced via other PROVIDE
</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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>ELF
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jh7370.2008@my.bristol.ac.uk
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Take the following snippet from a linker script:
.foo :
{
PROVIDE (__foo_start = .);
*(.foo.foo.*)
PROVIDE (__foo_end = .);
PROVIDE (__foo_size = __foo_end - __foo_start);
}
When linking with LLD, __foo_start and __foo_end are always defined, even if
nothing in objects reference them, despite being marked with PROVIDE.
__foo_size is not referenced or defined in this case. It appears that the
reference is generated for the __foo_size calculation, even though the
calculation is unnecessary (beause __foo_size is not itself referenced). This
does match gold's behaviour, but differs from bfd's, and also differs from my
natural expectation, since it prevents the above pattern from being useful.</pre>
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</p>
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