Use goma when USE_GOMA=true is set
With USE_GOMA, the path to gomacc in $GOMA_DIR or $HOME/goma
will be appended to CC_WRAPPER and CXX_WRAPPER.
Note this works only with USE_NINJA. Unlike ninja, GNU make
cannot change the parallelism depending on targets. Specifying
-j500 to GNU make would mean you may run 500 local jobs in
parallel, but with -j32 goma will just slow down the build.
Change-Id: I0f571454fd2a5b525ee29b445f7ab8715927ca00
diff --git a/core/goma.mk b/core/goma.mk
new file mode 100644
index 0000000..1d44aea
--- /dev/null
+++ b/core/goma.mk
@@ -0,0 +1,58 @@
+#
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Notice: this works only with Google's Goma build infrastructure.
+ifneq ($(USE_GOMA),)
+ # Check if USE_NINJA is defined because GNU make won't work well
+ # with goma. Note this file is evaluated twice, once with
+ # USE_NINJA=true by GNU make and once with USE_NINJA=false by kati
+ # which is invoked by GNU make. So, we cannot test the value of
+ # USE_NINJA.
+ ifndef USE_NINJA
+ $(error USE_GOMA=true works only with USE_NINJA=true)
+ endif
+
+ ifdef GOMA_DIR
+ goma_dir := $(GOMA_DIR)
+ else
+ goma_dir := $(HOME)/goma
+ endif
+ goma_ctl := $(goma_dir)/goma_ctl.py
+ goma_cc := $(goma_dir)/gomacc
+
+ $(if $(wildcard $(goma_ctl)),, \
+ $(warning You should have goma in $$GOMA_DIR or $(HOME)/goma) \
+ $(error See go/ma/how-to-use-goma/how-to-use-goma-for-android for detail))
+
+ # Append gomacc to existing *_WRAPPER variables so it's possible to
+ # use both ccache and gomacc.
+ CC_WRAPPER := $(strip $(CC_WRAPPER) $(goma_cc))
+ CXX_WRAPPER := $(strip $(CXX_WRAPPER) $(goma_cc))
+
+ # Ninja file generated by kati uses this for remote jobs (i.e.,
+ # commands which contain gomacc). Note the parallelism of all other
+ # jobs will be limited the number of cores.
+ KATI_REMOTE_NUM_JOBS_FLAG := --remote_num_jobs=500
+
+ # gomacc can start goma client's daemon process automatically, but
+ # it is safer and faster to start up it beforehand. We run this as a
+ # background process so this won't slow down the build.
+ $(shell $(goma_ctl) ensure_start &> /dev/null &)
+
+ goma_cc :=
+ goma_ctl :=
+ goma_dir :=
+endif