The mechanism by which PGO builds are kicked off is kinda wonky.
The MOZ_PGO environment variable is recognized by configure and setting
it will result in MOZ_PGO being defined in substs. In addition, the
build backend (previously client.mk, now Makefile.in) also recognizes
MOZ_PGO (from mozconfig or environment) and takes appropriate action.
In-tree mozconfigs set MOZ_PGO via mk_add_options. mk_add_options
is intended as a mechanism to inject state into client.mk and the
make-based build system.
In addition, there is code in mozharness (unchanged by this commit)
that sets MOZ_PGO if appropriate.
A PGO build configuration is different from a non-PGO build
configuration. Therefore a make-centric environment variable to
control PGO is not ideal. Instead, this should be defined as a
configure-time flag and the build invocation should key off that.
This commit normalizes in-tree mozconfigs to set MOZ_PGO via
ac_add_options and updates the PGO documentation to recommend
this method.
MozReview-Commit-ID: k6AZyJuXjs
--HG--
extra : rebase_source : b1a6348611eba08dd67ec938cca5586fbe8e6910
extra : source : 25c7ebc7c44dd253f421b6de3d0337635d0c99d0
An explanation of the Mozilla Source Code Directory Structure and links to
project pages with documentation can be found at:
https://developer.mozilla.org/en/Mozilla_Source_Code_Directory_Structure
For information on how to build Mozilla from the source code, see:
https://developer.mozilla.org/en/docs/Build_Documentation
To have your bug fix / feature added to Mozilla, you should create a patch and
submit it to Bugzilla (https://bugzilla.mozilla.org). Instructions are at:
https://developer.mozilla.org/en/docs/Creating_a_patch
https://developer.mozilla.org/en/docs/Getting_your_patch_in_the_tree
If you have a question about developing Mozilla, and can't find the solution
on https://developer.mozilla.org, you can try asking your question in a
mozilla.* Usenet group, or on IRC at irc.mozilla.org. [The Mozilla news groups
are accessible on Google Groups, or news.mozilla.org with a NNTP reader.]
You can download nightly development builds from the Mozilla FTP server.
Keep in mind that nightly builds, which are used by Mozilla developers for
testing, may be buggy. Firefox nightlies, for example, can be found at:
https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/
- or -
https://nightly.mozilla.org/
c2d58c7edd