bazel: add release configuration (#155)

Adds a `--config=release` option for building with Bazel. At the moment, this ensures that iOS builds include all 4 architectures instead of only x86. In the future, more configurations will likely be added here for better optimization settings.

Risk Level: Low
Testing: Locally
Docs Changes: In PR

Signed-off-by: JP Simard <[email protected]>

mobile/.bazelrc

@@ -28,3 +28,11 @@ build:device --ios_multi_cpus=armv7,arm64 --fat_apk_cpu=armeabi-v7a,arm64-v8a
 build:sim --ios_multi_cpus=i386,x86_64 --fat_apk_cpu=x86,x86_64
 
 build:fat --ios_multi_cpus=i386,x86_64,armv7,arm64 --fat_apk_cpu=x86,x86_64,armeabi-v7a,arm64-v8a
+
+# TODO: Enable `--copt -ggdb3`. Using this configuration currently requires python3.
+# https://github.com/lyft/envoy-mobile/pull/155#issuecomment-507461500
+# https://stackoverflow.com/a/38177538/1145804
+build:release \
+  --linkopt=-s \
+  --copt=-O2 \
+  --config=fat

mobile/docs/root/start/building/building.rst

@@ -51,7 +51,7 @@ Android AAR
 Envoy Mobile can be compiled into an ``.aar`` file for use with Android apps.
 This command is defined in the main :repo:`BUILD <BUILD>` file of the repo, and may be run locally:
 
-``./bazelw build android_dist --config=android``
+``./bazelw build android_dist --config=android --config=release # omit release for development``
 
 Upon completion of the build, you'll see an ``envoy.aar`` file at :repo:`dist/envoy.aar <dist>`.
 
@@ -64,6 +64,8 @@ an example of how this artifact may be used.
 
 For a demo of a working app using this artifact, see the :ref:`hello_world` example.
 
+When building the artifact for release (usage outside of development), be sure to include ``--config=release``
+
 .. _ios_framework:
 
 --------------------
@@ -73,7 +75,7 @@ iOS static framework
 Envoy Mobile supports being compiled into a ``.framework`` directory for consumption by iOS apps.
 This command is defined in the main :repo:`BUILD <BUILD>` file of the repo, and may be run locally:
 
-``./bazelw build ios_dist --config=ios``
+``./bazelw build ios_dist --config=ios --config=release # omit release for development``
 
 Upon completion of the build, you'll see a ``Envoy.framework`` directory at
 :repo:`dist/Envoy.framework <dist>`.
@@ -86,6 +88,9 @@ example of how this artifact may be used.
 
 For a demo of a working app using this artifact, see the :ref:`hello_world` example.
 
+When building the artifact for release (usage outside of development), be sure to include ``--config=release``
+in addition to ``--config=ios``.
+
 .. _releases: https://github.com/lyft/envoy-mobile/releases
 
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