Goma is a distributed compiler service for open-source project such as Chromium and Android. It's some kind of replacement of distcc+ccache.
NOTE: currently the goma backend is not available for non googlers. We're working so that chromium developers can use it. Stay tuned.
Goma hooks a compile request, and sends it to a backend compile server. If you have plenty of backend servers, a lot of compile can be processed in parallel, for example, -j100, -j500 or -j1000.
Also, the goma backend caches the compile result. If the same compile request comes, the cached result is returned from the goma cache server.
goma client can be built on Linux, Mac, and Win.
On debian or ubuntu,
$ sudo apt-get install libssl-dev libc6-dev-i386
On Mac, install Xcode.
On Windows, install Visual Studio 2017. Community edition is OK.
$ gclient config https://chromium.googlesource.com/infra/goma/client $ gclient sync $ cd client
We assume goma is checked out to
$ cd "$GOMA_SRC/client" $ gclient sync $ gn gen --args='is_debug=false' out/Release $ ninja -C out/Release
The build option can be modified with gn args.
is_debug=true/false Do debug build if true. dcheck_always_on=true/false Enable DCHECK always (even in release build). is_asan=true/false Use ASan build (with clang). use_link_time_optimization=true/false Currently working only on Win. If true, /LTCG is enable. use_lld=true/false Use lld for link (it will be fast)
$ cd "$GOMA_SRC/client" $ ./build/run_unittest.py --target=Release --build-dir=out
Goma can be integrated with Chromium/Android development easily.
$ "$GOMA_SRC/client/out/Release/goma_ctl.py" start
In Chromium src, specify the following args in
use_goma = true goma_dir = "$GOMA_SRC/client/out/Release" (Replace $GOMA_SRC to your checkout)
Then build like the following:
$ cd /path/to/chromium/src/out/Release $ ninja -j100 chrome
$ source build/envsetup.sh $ lunch aosp_arm-eng $ GOMA_DIR=$GOMA_SRC/client/out/Release USE_GOMA=true make -j4
-j4 is not related to goma parallelism. Android internally sets
NINJA_REMOTE_NUM_JOBS environment variable) for goma.
$ ./goma_ctl.py ensure_start
gomaccis prepended to compiler command. For example:
$ gomacc clang++ -c foo.cc
ninja -j100or larger -j. Check http://localhost:8080 to see compiler_proxy is actually working.