I recently landed a new feature for the "mach" build tool [1]. You can
now run mach from anywhere in the mozilla source tree.
To get started, add mach to your $PATH. You can do this by changing the
PATH environment variable to include the mozilla source directory, or by
copying the "mach" script from your source directory to a location like
/usr/local/bin.
Then you can run mach commands from anywhere in your source directory,
and you can use paths within your current directory. For example, if
you are working on some devtools code you might run commands like:
cd browser/devtools
# Rebuild the code in browser/devtools/webconsole:
mach build webconsole
# Run browser-chrome tests from browser/devtools/webconsole/test:
mach mochitest-browser webconsole/test
# Most commands work the same no matter where you run them:
mach clobber
mach build # Do a full rebuild
mach package
mach install
You can also run "mach" within an objdir. If you have multiple objdirs
with different mozconfigs, mach automatically defaults to the mozconfig
that built the current objdir. This means you can switch between
configurations as easily as:
cd obj-debug
mach build
mach xpcshell-test
cd ../obj-optimized
mach build
mach xpcshell-test
(Note: the automatically-detected mozconfig is used as a default, but
you can still override it by explicitly setting the MOZCONFIG
environment variable.)
The "mach" script is now just a wrapper; it loads the actual mach code
and configuration from whichever source directory you run it in. So you
can add mach to your path once and it should work with any current or
future mozilla-central directory. (For older trees, like the current
aurora or beta repos, you still need to run mach the old way, using
"./mach" in the top source directory.)
For development details, please see bugs 840588 and 840690 (but note
that the feature changed a bit since those bugs were first filed). Huge
thanks to gps and all the other people who helped in the design and
implementation of this feature!
[1] https://developer.mozilla.org/en-US/docs/Developer_Guide/mach
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=840588
[3] https://bugzilla.mozilla.org/show_bug.cgi?id=840690
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