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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-cl: <built-in> reported as included file for preprocessed source"
href="https://bugs.llvm.org/show_bug.cgi?id=48132">48132</a>
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<th>Summary</th>
<td>clang-cl: <built-in> reported as included file for preprocessed source
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>11.0
</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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>andrey.vihrov@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>With clang-cl, when the compilation is split into separate preprocessing and
compilation steps, "<built-in>" is reported as included file when using
/showIncludes.
Let x.cpp be an empty file. Then,
clang-cl /c /showIncludes x.cpp
succeeds with no output, as expected. However, running
clang-cl /E x.cpp > pre.cpp
clang-cl /c /showIncludes pre.cpp
outputs
Note: including file: <built-in>
The contents of pre.cpp are
# 1 "x.cpp"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 366 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "x.cpp" 2
This is the relevant code:
<a href="https://github.com/llvm/llvm-project/blob/a7a447be0fa934505f0c423fb97b91a68c1cc715/clang/lib/Frontend/HeaderIncludeGen.cpp#L178-L179">https://github.com/llvm/llvm-project/blob/a7a447be0fa934505f0c423fb97b91a68c1cc715/clang/lib/Frontend/HeaderIncludeGen.cpp#L178-L179</a>.
Observe that it skips "<command line>", but not "<built-in>".
Note: MSVC reports no includes at all when /showIncludes is used on a
preprocessed source.</pre>
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