skip test-386 for Mac OS 10.15.x (Catalina and upwards). (#521)

* skip test-386 for Mac OS 10.15.x (Catalina and upwards).

fixes #520

* fix indentation

* remove extra newlines.

Makefile

@@ -7,6 +7,16 @@ ALL_DOCS := $(shell find . -name '*.md' -type f | sort)
 ALL_GO_MOD_DIRS := $(filter-out $(TOOLS_MOD_DIR), $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort))
 ALL_COVERAGE_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | egrep -v '^./example|^$(TOOLS_MOD_DIR)' | sort)
 
+# Mac OS Catalina 10.5.x doesn't support 386. Hence skip 386 test
+SKIP_386_TEST = false
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Darwin)
+	SW_VERS := $(shell sw_vers -productVersion)
+	ifeq ($(shell echo $(SW_VERS) | egrep '^(10.1[5-9]|1[1-9]|[2-9])'), $(SW_VERS))
+		SKIP_386_TEST = true
+	endif
+endif
+
 GOTEST_MIN = go test -v -timeout 30s
 GOTEST = $(GOTEST_MIN) -race
 GOTEST_WITH_COVERAGE = $(GOTEST) -coverprofile=coverage.txt -covermode=atomic
@@ -73,11 +83,15 @@ test:
 
 .PHONY: test-386
 test-386:
-	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
-	  echo "go test ./... GOARCH 386 in $${dir}"; \
-	  (cd "$${dir}" && \
-	    GOARCH=386 $(GOTEST_MIN) ./...); \
-	done
+	if [ $(SKIP_386_TEST) = true ] ; then \
+	  echo "skipping the test for GOARCH 386 as it is not supported on the current OS"; \
+	else \
+	  set -e; for dir in $(ALL_GO_MOD_DIRS); do \
+	    echo "go test ./... GOARCH 386 in $${dir}"; \
+	    (cd "$${dir}" && \
+	      GOARCH=386 $(GOTEST_MIN) ./...); \
+	  done; \
+	fi
 
 .PHONY: examples
 examples: