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Example: configuring a hermetic toolchain on Linux

Bazel ships with an example compiler configuration for /usr/bin/gcc. While these are universally available, they are not hermetic: versions of the compiler may vary across installations.

The following example shows how to install a prebuilt toolchain, using the pre-packaged compilers from the Android Open Source project. The example includes configurations for

  • Compiling on linux-x86 for linux-x86 (64-bit)
  • Compiling on linux-x86 for linux-x86 (32-bit)
  • Compiling on linux-x86 for Window 64-bit w32 (untested)

  1. Create directory ~/toolchains/android-prebuilts/

  2. Download the binaries:

get-toolchains.sh
  1. Create the CROSSTOOL configuration
gen-crosstool.py
  1. Run Bazel, eg.
bazel build --package_path=%workspace%:$HOME/toolchains:$HOME/bazel \
  --crosstool_top=//android-prebuilts:toolchain \
  --cpu=i686 \
  //src/google/protobuf:protoc