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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang produces ambiguous .d files"
href="https://bugs.llvm.org/show_bug.cgi?id=41379">41379</a>
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<th>Summary</th>
<td>clang produces ambiguous .d files
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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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>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>andrew@ziglang.org
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Zig runs clang in a child process with `-MD -MF foo.d` and then parses `foo.d`
to find out the list of dependencies of the compilation.
The problem is that with or without `-MV`, the format is ambiguous.
Without -MV, on Windows, I saw this example file:
C:\msys64\home\andy\dev\zig\example\shared_library\zig-cache\tmp\CHLssWPWWG0d-test.obj:
\
C:\msys64\home\andy\dev\zig\example\shared_library\test.c \
C:\msys64\home\andy\dev\zig\example\shared_library\zig-cache\mathtest.h \
C:\Program\ Files\ (x86)\Microsoft\ Visual\
Studio\2017\Community\VC\Tools\MSVC\14.15.16726\lib\x64\\..\..\include\stdint.h
\
...
This is impossible to parse correctly - for example an escaped space is
indistinguishable from a path separator and then a space.
When I add `-MV`, the files are double-quote escaped, which fixes the issue.
However, `-MV` appears to not affect the "target", only the prerequisites. So
the problem remains for the target.
Downstream issue: <a href="https://github.com/ziglang/zig/issues/2046">https://github.com/ziglang/zig/issues/2046</a></pre>
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