@Override
protected ImmutableList<String> getShellCommandInternal(ExecutionContext context) {
Optional<Path> ndkRoot = context.getAndroidPlatformTarget().getNdkDirectory();
if (!ndkRoot.isPresent()) {
throw new HumanReadableException(
"Must define a local.properties file"
+ " with a property named 'ndk.dir' that points to the absolute path of"
+ " your Android NDK directory, or set ANDROID_NDK.");
}
Optional<Path> ndkBuild =
new ExecutableFinder().getOptionalExecutable(Paths.get("ndk-build"), ndkRoot.get());
if (!ndkBuild.isPresent()) {
throw new HumanReadableException("Unable to find ndk-build");
}
ConcurrencyLimit concurrencyLimit = context.getConcurrencyLimit();
ImmutableList.Builder<String> builder = ImmutableList.builder();
builder.add(
ndkBuild.get().toAbsolutePath().toString(),
"-j",
// TODO(user): using -j here is wrong. It lets make run too many work when we do other
// work in parallel. Instead, implement the GNU Make job server so make and Buck can
// coordinate job concurrency.
Integer.toString(concurrencyLimit.threadLimit),
"-C",
this.root.toString());
if (concurrencyLimit.loadLimit < Double.POSITIVE_INFINITY) {
builder.add("--load-average", Double.toString(concurrencyLimit.loadLimit));
}
Iterable<String> flags = Iterables.transform(this.flags, macroExpander);
builder.addAll(flags);
ProjectFilesystem projectFilesystem = context.getProjectFilesystem();
Function<Path, Path> absolutifier = projectFilesystem.getAbsolutifier();
// We want relative, not absolute, paths in the debug-info for binaries we build using
// ndk_library. Absolute paths are machine-specific, but relative ones should be the
// same everywhere.
Path relativePathToProject =
absolutifier.apply(this.root).relativize(projectFilesystem.getRootPath());
builder.add(
"APP_PROJECT_PATH=" + absolutifier.apply(buildArtifactsDirectory) + File.separatorChar,
"APP_BUILD_SCRIPT=" + absolutifier.apply(makefile),
"NDK_OUT=" + absolutifier.apply(buildArtifactsDirectory) + File.separatorChar,
"NDK_LIBS_OUT=" + projectFilesystem.resolve(binDirectory),
"BUCK_PROJECT_DIR=" + relativePathToProject);
// Suppress the custom build step messages (e.g. "Compile++ ...").
if (Platform.detect() == Platform.WINDOWS) {
builder.add("host-echo-build-step=@REM");
} else {
builder.add("host-echo-build-step=@#");
}
// If we're running verbosely, force all the subcommands from the ndk build to be printed out.
if (context.getVerbosity().shouldPrintCommand()) {
builder.add("V=1");
// Otherwise, suppress everything, including the "make: entering directory..." messages.
} else {
builder.add("--silent");
}
return builder.build();
}
