build/docs/mozconfigs.rst
author Iain Ireland <iireland@mozilla.com>
Fri, 11 Jan 2019 18:05:36 +0000
changeset 453523 025feea5945bffc625e9cca2e23be51ee8670315
parent 389170 c78fdb7724524585387b43ef958a17408827dcfa
permissions -rw-r--r--
Bug 1480390: Move ForOfIterClose logic inside TryNoteIter r=tcampbell This patch was intended to be a pure refactoring of existing code with no side-effects, moving the logic for handling for-of/for-of-iterclose trynotes inside TryNoteIter to avoid duplicating logic in all users of TryNoteIter. However, it turns out that there was a subtle preexisting bug in TryNoteIter that is fixed by the refactoring. Specifically, the logic to skip from a for-of-iterclose to its enclosing for-of must run before the logic to skip trynotes based on stack depth. Otherwise, the stack depth code may filter out the enclosing for-of (see the attached test case for an example) and we will skip too many try-notes. Differential Revision: https://phabricator.services.mozilla.com/D14783

.. _mozconfig:

===============
mozconfig Files
===============

mozconfig files are used to configure how a build works.

mozconfig files are actually shell scripts. They are executed in a
special context with specific variables and functions exposed to them.

API
===

Functions
---------

The following special functions are available to a mozconfig script.

ac_add_options
^^^^^^^^^^^^^^

This function is used to declare extra options/arguments to pass into
configure.

e.g.::

    ac_add_options --disable-tests
    ac_add_options --enable-optimize

mk_add_options
^^^^^^^^^^^^^^

This function is used to inject statements into client.mk for execution.
It is typically used to define variables, notably the object directory.

e.g.::

    mk_add_options AUTOCLOBBER=1

Special mk_add_options Variables
--------------------------------

For historical reasons, the method for communicating certain
well-defined variables is via mk_add_options(). In this section, we
document what those special variables are.

MOZ_OBJDIR
^^^^^^^^^^

This variable is used to define the :term:`object directory` for the current
build.

Finding the active mozconfig
============================

Multiple mozconfig files can exist to provide different configuration
options for different tasks. The rules for finding the active mozconfig
are defined in the
:py:func:`mozbuild.mozconfig.MozconfigLoader.find_mozconfig` method:

.. autoclass:: mozbuild.mozconfig.MozconfigLoader
   :members: find_mozconfig