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pr0cf5/Browser-Compilation-With-Custom-Clang.md

Created August 21, 2022 01:29
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  1. pr0cf5 created this gist Aug 21, 2022.
    23 changes: 23 additions & 0 deletions Browser-Compilation-With-Custom-Clang.md
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    # Chromium
    Let's assume we're trying to build chromium with `sancov`. Although this is possible purely with `gn` arguments, I'll demonstrate this with system toolchain.

    First, create a file at `out/sancov/args.gn`. The contents of the file should be as follows:
    ```
    custom_toolchain="//build/toolchain/linux/unbundle:default"
    host_toolchain="//build/toolchain/linux/unbundle:default"
    is_clang = true
    clang_use_chrome_plugins = false
    ```

    Second, execute the following commands.
    ```bash
    export LLVM_BIN_DIR="/usr/local/bin"
    export CC="$LLVM_BIN_DIR/clang"
    export CXX="$LLVM_BIN_DIR/clang++"
    export AR="$LLVM_BIN_DIR/llvm-ar"
    export SOLINK="$LLVM_BIN_DIR/lld"
    export NM="$LLVM_BIN_DIR/llvm-nm"
    export LDFLAGS="-fsanitize-coverage=trace-pc-guard"
    gn gen out/sancov
    autoninja -C out/sancov chrome
    ```