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rc
This contains a cross-platform reimplementation of rc.exe.
This exists mainly to compile .rc files on non-Windows hosts for cross builds. However, it also runs on Windows for two reasons:
- To compare the output of Microsoft's rc.exe and the reimplementation and to check that they produce bitwise identical output.
- The reimplementation supports printing resource files in /showIncludes output, which helps getting build dependencies right.
The resource compiler consists of two parts:
- A python script rc.py that serves as the driver. It does unicode conversions, runs the input through the preprocessor, and then calls the actual resource compiler.
- The resource compiler, a C++ binary obtained via sha1 files from Google Storage. The binary's code currenty lives at https://github.com/nico/hack/tree/master/res, even though work is (slowly) underway to upstream it into LLVM.
To update the rc binary, run upload_rc_binaries.sh in this directory, on a
Mac.
rc isn't built from source as part of the regular chrome build because it's needed in a gn toolchain tool, and these currently cannot have deps. Alternatively, gn could be taught about deps on tools, or rc invocations could be not a tool but a template like e.g. yasm invocations (which can have deps), then the prebuilt binaries wouldn't be needed.