Makefile: improve code coverage usage

Makefile.am

 ACLOCAL_AMFLAGS = -I m4
 SUBDIRS = libtap src tests samples doc man patches
 
-AM_DISTCHECK_CONFIGURE_FLAGS =		\
+AM_DISTCHECK_CONFIGURE_FLAGS = \
 	--disable-code-coverage
 
 code_coverage_quiet = --quiet
 
 check-code-coverage:
 if CODE_COVERAGE_ENABLED
+	$(MAKE) $(AM_MAKEFLAGS) code-coverage-initial
 	-$(MAKE) $(AM_MAKEFLAGS) -k check
 	$(MAKE) $(AM_MAKEFLAGS) code-coverage-capture
 	$(MAKE) $(AM_MAKEFLAGS) code-coverage-html
+	$(MAKE) $(AM_MAKEFLAGS) code-coverage-summary
+else
+	@echo "You need to run configure with --enable-code-coverage to enable code coverage"
+endif
+
+code-coverage-initial:
+if CODE_COVERAGE_ENABLED
+	$(LCOV) $(code_coverage_quiet) \
+		--directory $(top_builddir)/src/common \
+		--directory $(top_builddir)/src/knot \
+		--directory $(top_builddir)/src/libknot \
+		--capture --initial \
+		--ignore-errors source \
+		--base-directory $(top_builddir)/src \
+		--output-file "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-src_base.info" \
+		--test-name "$(PACKAGE_NAME)-$(PACKAGE_VERSION)" \
+		--no-checksum --compat-libtool
+	$(LCOV) $(code_coverage_quiet) \
+		--directory $(top_builddir)/src/knot/conf \
+		--capture --initial \
+		--ignore-errors source \
+		--base-directory $(top_builddir)/src/knot/conf \
+		--output-file "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-conf_base.info" \
+		--test-name "$(PACKAGE_NAME)-$(PACKAGE_VERSION)" \
+		--no-checksum --compat-libtool
+	$(LCOV) $(code_coverage_quiet) \
+		--directory $(top_builddir)/src/zscanner \
+		--capture --initial \
+		--ignore-errors source \
+		--base-directory $(top_builddir)/src/zscanner \
+		--output-file "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-zscanner_base.info" \
+		--test-name "$(PACKAGE_NAME)-$(PACKAGE_VERSION)" \
+		--no-checksum --compat-libtool
 else
 	@echo "You need to run configure with --enable-code-coverage to enable code coverage"
 endif
@@ -44,11 +78,13 @@ if CODE_COVERAGE_ENABLED
 		--test-name "$(PACKAGE_NAME)-$(PACKAGE_VERSION)" \
 		--no-checksum --compat-libtool
 	$(LCOV) $(code_coverage_quiet) \
+		--add-tracefile "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-src_base.info" \
+		--add-tracefile "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-conf_base.info" \
+		--add-tracefile "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-zscanner_base.info" \
 		--add-tracefile "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-src_capture.info" \
 		--add-tracefile "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-conf_capture.info" \
 		--add-tracefile "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-zscanner_capture.info" \
 		--output-file "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info"
-	-@rm -f $(PACKAGE_NAME)-$(PACKAGE_VERSION)-*_base.info $(PACKAGE_NAME)-$(PACKAGE_VERSION)-*_capture.info
 else
 	@echo "You need to run configure with --enable-code-coverage to enable code coverage"
 endif
@@ -63,14 +99,24 @@ else
 	@echo "You need to run configure with --enable-code-coverage to enable code coverage"
 endif
 
+code-coverage-summary:
+if CODE_COVERAGE_ENABLED
+	$(LCOV) \
+		--summary "$(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info"
+else
+	@echo "You need to run configure with --enable-code-coverage to enable code coverage"
+endif
+
 if CODE_COVERAGE_ENABLED
 clean-local: code-coverage-clean
+	-find . -name "*.gcno" -delete
 code-coverage-clean:
 	-$(LCOV) --directory $(top_builddir) -z
 	-rm -rf $(PACKAGE_NAME)-$(PACKAGE_VERSION)-*_base.info \
-	        $(PACKAGE_NAME)-$(PACKAGE_VERSION)-*_coverage.info \
+	        $(PACKAGE_NAME)-$(PACKAGE_VERSION)-*_capture.info \
+	        $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage.info \
 	        $(PACKAGE_NAME)-$(PACKAGE_VERSION)-coverage/
 	-find . -name "*.gcda" -o -name "*.gcov" -delete
 endif
 
-.PHONY: check-code-coverage code-coverage-initial code-coverage-capture code-coverage-html code-coverage-clean
+.PHONY: check-code-coverage code-coverage-initial code-coverage-capture code-coverage-html code-coverage-summary code-coverage-clean