How to use Facebook BUCK with DTrace files? - objective-c

Question

So, if you open https://github.com/airbnb/BuckSample
And will try to install with cocoaPods https://github.com/ReactiveCocoa/ReactiveObjC
and after you'll add a new BUCK build rule like
apple_third_party_lib(
name = "ReactiveObjC",
visibility = ["PUBLIC"],
srcs = glob([
"ReactiveObjC/**/*.m",
]),
exported_headers = glob([
"ReactiveObjC/**/*.h",
]),
frameworks = [
"$PLATFORM_DIR/Developer/Library/Frameworks/Foundation.framework",
],
)
buck build //Pods:ReactiveObjC will fail with error like this
Pods/ReactiveObjC/ReactiveObjC/RACPassthroughSubscriber.m:12:9: fatal error: 'RACSignalProvider.h' file not found
If we go further we'll see that RACSignalProvider.h is not in the Pod sources, but there is RACSignalProvider.d which is DTrace source file.
When we try to compile it with XCode we can see that there is an extra step before compiling actual framwork
CompileDTraceScript /*user folder*/Pods/ReactiveObjC/ReactiveObjC/RACSignalProvider.d (in target 'ReactiveObjC' from project 'Pods')
cd /*user folder*/Pods
/usr/sbin/dtrace -h -s /*user folder*/Pods/ReactiveObjC/ReactiveObjC/RACSignalProvider.d -o /*user folder*/Library/Developer/Xcode/DerivedData/Odnoklassniki-gsukbcogkxolydbhlpglswzdhhpg/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/ReactiveObjC.build/DerivedSources/RACSignalProvider.h
which is not happening when we run buck build
Is there something missing from config? Or this just not supported by BUCK?

Answer 1

So the answer is, you need to use a genrule() to process your DTrace files
It should look like
genrule(
name = "ReactiveObjC_DTrace",
srcs = [
"ReactiveObjC/ReactiveObjC/RACSignalProvider.d",
"ReactiveObjC/ReactiveObjC/RACCompoundDisposableProvider.d",
],
bash =
"""
mkdir -p $OUT
/usr/sbin/dtrace -h -s $SRCDIR/ReactiveObjC/ReactiveObjC/RACSignalProvider.d -o $OUT/RACSignalProvider.h
/usr/sbin/dtrace -h -s $SRCDIR/ReactiveObjC/ReactiveObjC/RACCompoundDisposableProvider.d -o $OUT/RACCompoundDisposableProvider.h
""",
out = "ReactiveObjC_DTrace",
visibility = ["PUBLIC"]
)
And then modify your ReactiveObjC rule to look like
apple_third_party_lib(
name = "ReactiveObjC",
visibility = ["PUBLIC"],
srcs = glob([
"ReactiveObjC/**/*.m",
]),
deps = [
"//Pods:ReactiveObjC_DTrace",
],
exported_headers = glob([
"ReactiveObjC/**/*.h",
"$(location :ReactiveObjC_DTrace)/**/*.h"
]),
frameworks = [
"$PLATFORM_DIR/Developer/Library/Frameworks/Foundation.framework",
],
)