Here is a wiki page to track our progress on this front and our means of synchronizing on this work:
https://wiki.mozilla.org/Platform/Porting_to_unified_sources Benoit 2013/11/14 Ehsan Akhgari <ehsan.akhg...@gmail.com> > I've started to work on a project in my spare time to switch us to use > unified builds for C/C++ compilation. The way that unified builds work is > by using the UNIFIED_SOURCES instead of the SOURCES variable in moz.build > files. With that, the build system creates files such as: > > // Unified_cpp_path_0.cpp > #include "Source1.cpp" > #include "Source2.cpp" > // ... > > And compiles them instead of the individual source files. > > The advantage of this is that it speeds up the compilation (I've measured > between 6-15x speed improvement depending on the code in question > locally.) But there are also trade-offs with this approach. One trade-off > is that the source code might require changes before it can be compiled in > this way, due to things like name clashes, etc. The other one is that if > you change one .cpp file which is built in unified mode, we would spend > more time compiling it because we'll be compiling the unified .cpp file > which includes more than what you have changed. It's hard to come up with > numbers for this trade-off, but assuming that the linking step takes way > longer than the C++ compilation in the "touch one .cpp file" scenario, and > also that changes to headers will potentially trigger multiple .cpp > rebuilds in the same directory, I think doing unified builds in more parts > of the tree is a reasonable choice. > > I'm going to continue working on this as time permits, if you're interested > in helping out, or if you have questions, please get in touch. > > Cheers, > -- > Ehsan > <http://ehsanakhgari.org/> > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
