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android13/build/bazel/scripts/difftool/README.md

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Difftool

This directory contains tools to compare build artifacts from two separate build invocations as a way of gauging build correctness and debugging potential problems with build systems under development.

Usage

Use of these tools requires a multistep process:

  1. Build using legacy build system: 
    $ m libc
  2. Collect results to a tmp directory. 
    $ ./collect.py out/combined-aosp_flame.ninja \
      out/target/product/flame/obj/libc.so \
      /tmp/legacyFiles
  3. Build using the new build system: 
    $ USE_BAZEL_ANALYSIS=1 m libc
  4. Collect results to a tmp directory. 
    $ ./collect.py out/combined-aosp_flame.ninja \
      out/target/product/flame/obj/libc.so \
      /tmp/newFiles
  5. Run comparative analysis on the two tmp directories. (See documentation of difftool.py for exact usage.) 
    $ ./difftool.py /tmp/legacyFiles \
      out/target/product/flame/obj/libc.so \
      /tmp/newFiles \
      out/target/product/flame/obj/libc.so

Use ./collect.py -h or ./difftool.py -h for full usage information of these subtools.