Split ios_application configurations based on --ios_multi_cpus.

Using the new flag works only on ios_application and ios_extension targets,
resulting in their output binaries being "universal" with all given architectures
included.

Internally this is achieved by splitting the "binary" dependency (and its transitive
dependencies) of ios_{application,extension} to be built in one of the architectures
using split transitions. The results are then combined. Since an ios_application may
depend on ios_extension, we transition back to the top-level configuration when
encoutering such a dependency using the newly introduced TOP_LEVEL transition and then
split configurations again.

RELNOTES: --ios_multi_cpus allows building fat ios_applications.

--
MOS_MIGRATED_REVID=88555540

1 files changed, 10 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/IosApplicationRule.java b/src/main/java/com/google/devtools/build/lib/rules/objc/IosApplicationRule.java
index 497955ea92..040a81f77f 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/IosApplicationRule.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/IosApplicationRule.java
@@ -18,6 +18,7 @@ import static com.google.devtools.build.lib.packages.Attribute.ConfigurationTran
 import static com.google.devtools.build.lib.packages.Attribute.attr;
 import static com.google.devtools.build.lib.packages.Type.BOOLEAN;
 import static com.google.devtools.build.lib.packages.Type.LABEL;
+import static com.google.devtools.build.lib.packages.Type.LABEL_LIST;
 
 import com.google.devtools.build.lib.analysis.BaseRuleClasses;
 import com.google.devtools.build.lib.analysis.BlazeRule;
@@ -60,6 +61,15 @@ public class IosApplicationRule implements RuleDefinition {
             .allowedRuleClasses("objc_binary")
             .allowedFileTypes()
             .mandatory()
+            .direct_compile_time_input()
+            .cfg(ReleaseBundlingSupport.SPLIT_ARCH_TRANSITION))
+        /* <!-- #BLAZE_RULE(ios_application).ATTRIBUTE(extensions) -->
+        Any extensions to include in the final application.
+        ${SYNOPSIS}
+        <!-- #END_BLAZE_RULE.ATTRIBUTE -->*/
+        .add(attr("extensions", LABEL_LIST)
+            .allowedRuleClasses("ios_extension")
+            .allowedFileTypes()
             .direct_compile_time_input())
         .add(attr("$runner_script_template", LABEL).cfg(HOST)
             .value(env.getLabel("//tools/objc:ios_runner.sh.mac_template")))