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