This file explains how to set up and run the various kinds of bisection tests.

The bisection tool comes with several sets of tests which you should
run after updating any of the bisection tool scripts OR after updating
the Android compiler wrapper (to make sure the wrapper will still work
correctly with bisection).

Before you start.
----------------

Before you can run the tests, your PYTHONPATH environment variable
must be correct.  This means that it must include both the
toolchain-utils directory and the binary_search_tool directory.  The
easiest way to set it is:

$ cd toolchain-utils
$ export PYTHONPATH=`pwd`:${PYTHONPATH}
$ cd binary_search_tool
$ export PYTHONPATH=`pwd`:${PYTHONPATH}


Running the unittests.
----------------------

To run the basic unit tests:

$ cd toolchain-utils/binary_search_tool/test
$ ./binary_search_tool_tester.py

Running the bisection tests, testing the compiler wrapper.
----------------------------------------------------------

If you want to run the bisection tests, and test the compiler wrapper
(to make sure the POPULATE_GOOD and POPULATE_BAD stages are still
working properly) you can do something like the following.  The steps
below illustrate how to test with the Android compiler wrapper, but
the steps for testing with the ChromeOS compiler wrapper would be very
similar.


Set up the compiler wrapper to replace GCC:

    $ cd <android-root/prebuilts/clang/host/linux-x86/clang-368880/bin
    $ cp clang gcc
    $ whereis gcc
    gcc: /usr/bin/gcc /usr/lib/gcc /usr/bin/X11/gcc /usr/share/man/man1/gcc.1.gz
    $ cd /usr/bin
    $ ls -l gcc
    lrwxrwxrwx 1 root root 7 Feb  3 17:00 gcc -> gcc-4.8*
    $ sudo mv gcc gcc.real
    $ sudo ln -s <android-root>/prebuilts/clang/host/linux-x86/clang-3688880/bin/gcc gcc

Move to the correct directory, then run the test script:

    $ cd toolchain-utils/binary_search_tool
    $ ./run_bisect_test.py


Running the bisection tests, without testing the compiler wrapper.
------------------------------------------------------------------

$ cd toolchain-utils/binary_search_tool
$ ./full_bisect_test/run-test-nowrapper.sh