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tin-z/Browser-Compilation-With-Custom-Clang.md

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Created March 24, 2025 23:00
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Instructions for compiling browsers with custom llvm binaries
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Browser-Compilation-With-Custom-Clang.md

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.

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
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