[annotations] produce a sources JAR for the infer annotations

Summary:
Some of the new thread-safety annotations are somewhat difficult to understand based on the name alone.
Devs can link a sources JAR with the annotations in their IDE to quickly understand the purpose of each annotation.

Reviewed By: jeremydubreil

Differential Revision: D4451748

fbshipit-source-id: 1ba6060

.gitignore

@@ -117,7 +117,7 @@ buck-out/
 
 /infer/annotations/annot_classes/
 /infer/annotations/annotations.jar
-/infer/annotations/processor_classes/
+/infer/annotations/annotations-src.jar
 infer/src/.project
 /dependencies/ocamldot/ocamldot
 /dependencies/ocamldot/ocamldot.ml

infer/annotations/Makefile

@@ -14,14 +14,19 @@ ANNOT_SOURCES = $(shell find com/facebook/infer/annotation -name "*.java")
 ANNOT_CLASSES = 'annot_classes'
 
 ANNOTATIONS_JAR = $(CWD)/annotations.jar
+SOURCES_JAR = $(CWD)/annotations-src.jar
 
-all: $(ANNOTATIONS_JAR)
+all: $(ANNOTATIONS_JAR) $(SOURCES_JAR)
 
 $(ANNOTATIONS_JAR): $(ANNOT_SOURCES)
 	mkdir -p $(ANNOT_CLASSES)
 	javac -source 7 -target 7 -cp $(JSR_JAR) $(ANNOT_SOURCES) -d $(ANNOT_CLASSES)
 	cd $(ANNOT_CLASSES) && jar cvf $(ANNOTATIONS_JAR) com
 
+$(SOURCES_JAR): $(ANNOT_SOURCES)
+	jar cvf $(SOURCES_JAR) com
+
 clean:
 	@rm -rf $(ANNOT_CLASSES)
 	@rm -f $(ANNOTATIONS_JAR)
+	@rm -f $(SOURCES_JAR)