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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - many files rebuilt after adding empty commit to llvm repo (cmake + ninja)"
href="https://bugs.llvm.org/show_bug.cgi?id=34308">34308</a>
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<th>Summary</th>
<td>many files rebuilt after adding empty commit to llvm repo (cmake + ninja)
</td>
</tr>
<tr>
<th>Product</th>
<td>Build scripts
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>cmake
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>matthias.krueger@famsik.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This looks like the worse brother of #33717 .
My setup consists of llvm, clang, clang-tools-extra, compiler-rt, polly, lld,
lldb and openmp repos.
Using cmake and ninja to build only the targets clang LLVMgold llvm-ar
llvm-ranlib lld and afterwards check-llvm check-clang check-lld.
I noticed that ninja would always rebuild ~1900 files even if only a single cpp
file changed after the last pull.
Upon investigating, it turned out that an empty commit (git commit
--allow-empty) in the llvm repo is enough to make ninja rebuilt hundreds of
files. :/
However doing consecutive build without file changes/commits works fine and
ninja continues where it was last stopped.
My full bootstrap script can be found here:
<a href="https://github.com/matthiaskrgr/llvm_bootstrap/blob/master/build_git.sh">https://github.com/matthiaskrgr/llvm_bootstrap/blob/master/build_git.sh</a></pre>
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</p>
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