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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -frewrite-includes doesn't handle __has_include in macro expansion"
href="https://bugs.llvm.org/show_bug.cgi?id=37990">37990</a>
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<th>Summary</th>
<td>-frewrite-includes doesn't handle __has_include in macro expansion
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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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>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>arichardson.kde@gmail.com
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>I was trying to get a reduced test case for a crash in libc++ and QtBase but I
couldn't use clang -cc1 on the preprocessed source. It would fail with
compilation errors instead of the assertion I was trying to track down.
It turns out that both of these projects have a custom macro wrapping
__has_include()
and -frewrite-includes does not rewrite that to 0 or 1 so the invocation fails
on the rewritten source.
I have added a local hack to handle the Qt and libc++ macro names in
<a href="https://github.com/CTSRD-CHERI/clang/commit/05aafbf0c6cd7099b7d53466b58a8b8214d29f33">https://github.com/CTSRD-CHERI/clang/commit/05aafbf0c6cd7099b7d53466b58a8b8214d29f33</a>
but I guess a real fix is needed instead. If people are interested I'm happy to
put it up for review. Especially the libc++ macro is probably used in lots of
crash reproducers so it might help with getting a reduced test case from
C++-specific crashes.</pre>
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