Bug 1307435 - Generate symbols zip file concurrently; r=ted

Each archive takes 10+ seconds to generate. Split the archiving
part into separate make targets so this completes faster.

I'm not super thrilled about adding yet more make targets to the
root Makefile.in. We can refactor this later. For now, let's
take the quick win.

MozReview-Commit-ID: 2Oeq1rX6yLw

Makefile.in

@@ -306,8 +306,8 @@ SYMBOL_INDEX_NAME = \
   $(MOZ_APP_NAME)-$(MOZ_APP_VERSION)-$(OS_TARGET)-$(BUILDID)-$(CPU_ARCH)-symbols.txt
 endif
 
-buildsymbols:
-ifdef MOZ_CRASHREPORTER
+.PHONY: generatesymbols
+generatesymbols:
 	echo building symbol store
 	$(RM) -r $(DIST)/crashreporter-symbols
 	$(RM) '$(DIST)/$(SYMBOL_ARCHIVE_BASENAME).zip'
@@ -323,14 +323,25 @@ ifdef MOZ_CRASHREPORTER
 	  $(DIST)/crashreporter-symbols/$(SYMBOL_INDEX_NAME)
 	echo packing symbols
 	$(NSINSTALL) -D $(DIST)/$(PKG_PATH)
+
+.PHONY: symbolsfullarchive
+symbolsfullarchive: generatesymbols
 	cd $(DIST)/crashreporter-symbols && \
           zip -r5D '../$(PKG_PATH)$(SYMBOL_FULL_ARCHIVE_BASENAME).zip' . -x '*test*' -x '*Test*'
+
+.PHONY: symbolsarchive
+symbolsarchive: generatesymbols
 	cd $(DIST)/crashreporter-symbols && \
 	grep 'sym' $(SYMBOL_INDEX_NAME) > $(SYMBOL_INDEX_NAME).tmp && \
 	  mv $(SYMBOL_INDEX_NAME).tmp $(SYMBOL_INDEX_NAME)
 	cd $(DIST)/crashreporter-symbols && \
           zip -r5D '../$(PKG_PATH)$(SYMBOL_ARCHIVE_BASENAME).zip' . -i '*.sym' -i '*.txt'
-endif # MOZ_CRASHREPORTER
+
+ifdef MOZ_CRASHREPORTER
+buildsymbols: symbolsfullarchive symbolsarchive
+else
+buildsymbols:
+endif
 
 uploadsymbols:
 ifdef MOZ_CRASHREPORTER