https://bugs.llvm.org/show_bug.cgi?id=41379
Bug ID: 41379
Summary: clang produces ambiguous .d files
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
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: https://github.com/ziglang/zig/issues/2046
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