[build] Improve markdown-link-check output (open-telemetry#602)

* Improve markdown-link-check output

* Introduce errors to check if the build works

* Revert "Introduce errors to check if the build works"

This reverts commit b31f46f.

* Merge markdown-link-check and enforce-markdown-link-check

* Make Makefile more readable

Author: arminru

.circleci/config.yml

@@ -28,7 +28,7 @@ jobs:
           name: Run Tools
           command: |
             make markdown-lint
-            make enforce-markdown-link-check
+            make markdown-link-check
 
 workflows:
   version: 2

Makefile

@@ -23,18 +23,7 @@ install-markdown-link-check:
 
 .PHONY: markdown-link-check
 markdown-link-check:
-	find . -name \*.md -exec $(MARKDOWN_LINK_CHECK) {} \;
-
-.PHONY: enforce-markdown-link-check
-enforce-markdown-link-check:
-	@LINKCHECKOUT=`find . -name \*.md -exec $(MARKDOWN_LINK_CHECK) {} 2>&1 >/dev/null \;`; \
-		if [ "$$LINKCHECKOUT" ]; then \
-			echo "$(MARKDOWN_LINK_CHECK) FAILED => errors:\n"; \
-			echo "Run 'make $(MARKDOWN_LINK_CHECK)' to see the errors"; \
-			exit 1; \
-		else \
-			echo "Check markdown links finished successfully"; \
-		fi
+	find . -name \*.md -print0 | xargs -0 -n1 $(MARKDOWN_LINK_CHECK) --quiet
 
 .PHONY: install-markdown-lint
 install-markdown-lint: