[make] restore output of errors

Summary:
Lost in D7569054: because `-e` is set, the command to run needs to be wrapped a
bit more carefully to continue the execution in case of failure and get to the
part where we print the error messages on the console.

Reviewed By: mbouaziz

Differential Revision: D7599442

fbshipit-source-id: 65f6bf7

Makefile

@@ -285,7 +285,7 @@ ocaml_unit_test: test_build
 	INFER_ARGS=--results-dir^infer-out-unit-tests $(BUILD_DIR)/test/inferunit.bc)
 
 define silence_make
-  $(1) 2> >(grep -v "warning: \(ignoring old\|overriding\) \(commands\|recipe\) for target")
+  $(1) 2> >(grep -v 'warning: \(ignoring old\|overriding\) \(commands\|recipe\) for target')
 endef
 
 .PHONY: $(DIRECT_TESTS:%=direct_%_test)

Makefile.config

@@ -169,9 +169,10 @@ define silent_on_success
       "$$HUMAN_START_DATE" "$$HASH" "$(1)"; \
   fi; \
   $(MKDIR_P) $(ABSOLUTE_ROOT_DIR)/_build_logs; \
+  ERRCODE=0; \
   ($(2)) 1>$(ABSOLUTE_ROOT_DIR)/_build_logs/cmd-$$HASH.out \
-         2>$(ABSOLUTE_ROOT_DIR)/_build_logs/cmd-$$HASH.err; \
+         2>$(ABSOLUTE_ROOT_DIR)/_build_logs/cmd-$$HASH.err \
-  ERRCODE=$$?; \
+  || ERRCODE=$$?; \
   if [ $$ERRCODE != 0 ]; then \
     echo "$(TERM_ERROR)[*ERROR**][$$HASH] *** ERROR '$(1)'$(TERM_RESET)" >&2; \
     echo "$(TERM_ERROR)[*ERROR**][$$HASH] *** command: '$(2)'$(TERM_RESET)" >&2; \
@@ -182,7 +183,7 @@ define silent_on_success
     echo "$(TERM_ERROR)[*ERROR**][$$HASH] *** stderr:$(TERM_RESET)" >&2; \
     sed -e "s/^\(.*\)$$/$(TERM_ERROR)[*ERROR**][$$HASH]$(TERM_RESET) \1/" \
       $(ABSOLUTE_ROOT_DIR)/_build_logs/cmd-$$HASH.err; >&2; \
-    exit 1; \
+    exit $$ERRCODE; \
   elif [ -z $(SILENT) ]; then \
     UNIX_END_DATE=$$(date +"%s"); \
     printf '[%7ss][%$(MAX_PID_SIZE)s] $(TERM_SUCCESS)SUCCESS %s$(TERM_RESET)\n' \