[cfe-users] temporary file while codegeneration

[Xin Tong]

Hi

I see that clang creates a temporary file when generating bc/ll/.o files
and it moves the temporary file to the final file when the code generation
is complete. Any reason why a temporary file is needed here ?


CompilerInstance::createDefaultOutputFile(bool Binary,
                                          StringRef InFile,
                                          StringRef Extension) {
  return createOutputFile(getFrontendOpts().OutputFile, Binary,
                          /*RemoveFileOnSignal=*/true, InFile,
                        Extension,
                          -/*UseTemporary=*/true-);
}
Thanks
Xin
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