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If raw_fd_ostream is constructed with the path of "-", it claims ownership of the stdout file descriptor. This means that it closes stdout when it is destroyed. If there are multiple users of raw_fd_ostream wrapped around stdout, then a crash can occur because of operations on a closed stream. An example of this would be running something like "clang -S -o - -MD -MF - test.cpp". Alternatively, using outs() (which creates a local version of raw_fd_stream to stdout) anywhere combined with such a stream usage would cause the crash. The fix duplicates the stdout file descriptor when used within raw_fd_ostream, so that only that particular descriptor is closed when the stream is destroyed. Patch by James Henderson! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297624 91177308-0d34-0410-b5e6-96231b3b80d8 |
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