/** Only works with thin binaries. */
private CxxPlatform getCxxPlatformForBuildTarget(BuildTarget target) {
CxxPlatform cxxPlatform;
try {
cxxPlatform = cxxPlatformFlavorDomain.getValue(target.getFlavors()).or(defaultCxxPlatform);
} catch (FlavorDomainException e) {
throw new HumanReadableException(e, "%s: %s", target, e.getMessage());
}
return cxxPlatform;
}
@Override
public <A extends Arg> BuildRule createBuildRule(
TargetGraph targetGraph, BuildRuleParams params, BuildRuleResolver ruleResolver, A args) {
// See if we're building a particular "type" of this library, and if so, extract
// it as an enum.
Optional<Map.Entry<Flavor, Type>> type;
Optional<Map.Entry<Flavor, CxxPlatform>> platform;
try {
type =
LIBRARY_TYPE.getFlavorAndValue(ImmutableSet.copyOf(params.getBuildTarget().getFlavors()));
platform =
cxxPlatforms.getFlavorAndValue(ImmutableSet.copyOf(params.getBuildTarget().getFlavors()));
} catch (FlavorDomainException e) {
throw new HumanReadableException("%s: %s", params.getBuildTarget(), e.getMessage());
}
// If we *are* building a specific type of this lib, call into the type specific
// rule builder methods. Currently, we only support building a shared lib from the
// pre-existing static lib, which we do here.
if (type.isPresent()) {
Preconditions.checkState(type.get().getValue() == Type.EXTENSION);
Preconditions.checkState(platform.isPresent());
return createExtensionBuildRule(
targetGraph, params, ruleResolver, platform.get().getValue(), args);
}
// Otherwise, we return the generic placeholder of this library, that dependents can use
// get the real build rules via querying the action graph.
SourcePathResolver pathResolver = new SourcePathResolver(ruleResolver);
Path baseModule = PythonUtil.getBasePath(params.getBuildTarget(), args.baseModule);
return new CxxPythonExtension(
params,
ruleResolver,
pathResolver,
baseModule.resolve(getExtensionName(params.getBuildTarget())));
}