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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -fsanitize=address implies -undefined dynamic_lookup, hides real linker errors"
href="http://llvm.org/bugs/show_bug.cgi?id=17275">17275</a>
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<th>Summary</th>
<td>-fsanitize=address implies -undefined dynamic_lookup, hides real linker errors
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<th>Product</th>
<td>compiler-rt
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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>compiler-rt
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>dfarler@apple.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Using -fsanitize=address automatically implies -undefined dynamic_lookup,
hiding real link-time errors.
If we need to leave ___asan* undefined in a dynamic library to be provided by
an executable built with ASan, it needs to be done specifically and not in
blanket fashion, forcing an entire dynamic library suffer runtime errors. For
example, OS X ld has -U <symbol>, which allows a symbol to remain undefined at
link time. If there is a cross platform way to ignore generated undefined ASan
symbols, we should exploit it.
This implication has already let several link-time errors sneak through to
runtime, wasting time.</pre>
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