Pull request: all: add race build mode

Squashed commit of the following:

commit 37ca296
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Apr 2 13:27:32 2021 +0300

    all: run tests with race enabled

commit 20af1ab
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Apr 2 13:14:36 2021 +0300

    all: add race build mode

Makefile

@@ -15,6 +15,7 @@ GPG_KEY = devteam@adguard.com
 GPG_KEY_PASSPHRASE = not-a-real-password
 NPM = npm
 NPM_FLAGS = --prefix $(CLIENT_DIR)
+RACE = 0
 SIGN = 1
 VERBOSE = 0
 VERSION = v0.0.0
@@ -30,6 +31,7 @@ ENV = env\
 	GO='$(GO)'\
 	GOPROXY='$(GOPROXY)'\
 	PATH="$${PWD}/bin:$$($(GO) env GOPATH)/bin:$${PATH}"\
+	RACE='$(RACE)'\
 	SIGN='$(SIGN)'\
 	VERBOSE='$(VERBOSE)'\
 	VERSION='$(VERSION)'\
@@ -75,9 +77,12 @@ js-beta-test: ; # TODO(v.abdulmyanov): Add tests for the new client.
 go-build: ; $(ENV) "$(SHELL)" ./scripts/make/go-build.sh
 go-deps:  ; $(ENV) "$(SHELL)" ./scripts/make/go-deps.sh
 go-lint:  ; $(ENV) "$(SHELL)" ./scripts/make/go-lint.sh
-go-test:  ; $(ENV) "$(SHELL)" ./scripts/make/go-test.sh
 go-tools: ; $(ENV) "$(SHELL)" ./scripts/make/go-tools.sh
 
+# TODO(a.garipov): Think about making RACE='1' the default for all
+# targets.
+go-test:  ; $(ENV) RACE='1' "$(SHELL)" ./scripts/make/go-test.sh
+
 go-check: go-tools go-lint go-test
 
 openapi-lint: ; cd ./openapi/ && $(YARN) test

scripts/make/go-build.sh

@@ -91,10 +91,22 @@ else
 	readonly out_flags=''
 fi
 
-# Don't use cgo.  Use modules.
-export CGO_ENABLED='0' GO111MODULE='on'
+# Allow users to enable the race detector.  Unfortunately, that means
+# that CGo must be enabled.
+readonly race="${RACE:-0}"
+if [ "$race" = '0' ]
+then
+	readonly cgo_enabled='0'
+	readonly race_flags=''
+else
+	readonly cgo_enabled='1'
+	readonly race_flags='--race'
+fi
+
+export CGO_ENABLED="$cgo_enabled"
+export GO111MODULE='on'
 
-readonly build_flags="${BUILD_FLAGS:-$out_flags $par_flags\
+readonly build_flags="${BUILD_FLAGS:-$race_flags $out_flags $par_flags\
 	$v_flags $x_flags}"
 
 # Don't use quotes with flag variables to get word splitting.