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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -C requires -E"
href="https://bugs.llvm.org/show_bug.cgi?id=45449">45449</a>
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<th>Summary</th>
<td>-C requires -E
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>ndesaulniers@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>enh@google.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk, sguelton@redhat.com, srhines@google.com, tstellar@redhat.com
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<p>
<div>
<pre>Upgrading Android's checkout of GNU Make to version 3.4
(<a href="https://android-review.googlesource.com/c/toolchain/make/+/1278571">https://android-review.googlesource.com/c/toolchain/make/+/1278571</a>) exposed a
build failure due to the error: invalid argument '-C' only allowed with '-E'.
Documented here:
<a href="https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options">https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html#Preprocessor-Options</a>
I suspect it's just a slight papercut, and that we should just have `-C` imply
`-E` which I think would match GCC's behavior. Otherwise we should submit a
patch to GNU Make to use `-C -E` together for portability to Clang.</pre>
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