* does not support -X ldflag: https://github.com/golang/go/issues/25183
* does not support -cover testflag
* needs CGO to be enabled to build syscall module
* wants -gccgoflags, not -ldflags
* don't test stuff we've disabled

--- gitlab-runner-v12.1.0/Makefile	2019-07-19 12:13:32.000000000 +0000
+++ gitlab-runner-v12.1.0/Makefile	2020-04-26 23:58:20.823352305 +0000
@@ -4,7 +4,6 @@ export VERSION := $(shell ./ci/version)
 REVISION := $(shell git rev-parse --short=8 HEAD || echo unknown)
 BRANCH := $(shell git show-ref | grep "$(REVISION)" | grep -v HEAD | awk '{print $$2}' | sed 's|refs/remotes/origin/||' | sed 's|refs/heads/||' | sort | head -n 1)
 BUILT := $(shell date -u +%Y-%m-%dT%H:%M:%S%z)
-export TESTFLAGS ?= -cover
 
 LATEST_STABLE_TAG := $(shell git -c versionsort.prereleaseSuffix="-rc" -c versionsort.prereleaseSuffix="-RC" tag -l "v*.*.*" --sort=-v:refname | awk '!/rc/' | head -n 1)
 export IS_LATEST :=
@@ -45,14 +44,11 @@ export PATH := $(GOPATH_BIN):$(PATH)
 
 # Packages in vendor/ are included in ./...
 # https://github.com/golang/go/issues/11659
-export OUR_PACKAGES ?= $(subst _$(BUILD_DIR),$(PKG),$(shell go list ./... | grep -v '/vendor/'))
+export OUR_PACKAGES ?= $(subst _$(BUILD_DIR),$(PKG),$(shell go list ./... | grep -ve '/vendor/' -e '/cache/gcs' -e '/cache/s3' -e '/docker' -e '/kubernetes' -e '/parallels' -e '/virtualbox'))
 
-GO_LDFLAGS ?= -X $(COMMON_PACKAGE_NAMESPACE).NAME=$(PACKAGE_NAME) -X $(COMMON_PACKAGE_NAMESPACE).VERSION=$(VERSION) \
-              -X $(COMMON_PACKAGE_NAMESPACE).REVISION=$(REVISION) -X $(COMMON_PACKAGE_NAMESPACE).BUILT=$(BUILT) \
-              -X $(COMMON_PACKAGE_NAMESPACE).BRANCH=$(BRANCH) \
-              -s -w
+GO_LDFLAGS ?= -s -w
 GO_FILES ?= $(shell find . -name '*.go' | grep -v './.gopath/')
-export CGO_ENABLED ?= 0
+export CGO_ENABLED ?= 1
 
 
 # Development Tools
@@ -114,7 +110,7 @@ build: $(GOX)
 build_simple: $(GOPATH_SETUP)
 	# Building $(NAME) in version $(VERSION) for current platform
-	go build \
-		-ldflags "$(GO_LDFLAGS)" \
+	go build -v \
+		-gccgoflags "$(GO_LDFLAGS)" \
 		-o "out/binaries/$(NAME)" \
 		$(PKG)
 
@@ -123,7 +119,7 @@ build_current: helper-docker build_simpl
 check_race_conditions:
 	@./scripts/check_race_conditions $(OUR_PACKAGES)
 
-test: $(PKG_BUILD_DIR) helper-docker
+test: $(PKG_BUILD_DIR)
 	go test $(OUR_PACKAGES) $(TESTFLAGS)
 
 parallel_test_prepare: $(GOPATH_SETUP)
--- gitlab-runner-v12.1.0/common/version.go	2019-07-19 12:13:32.000000000 +0000
+++ gitlab-runner-v12.1.0/common/version.go	2020-04-27 00:57:04.923408027 +0000
@@ -9,9 +9,9 @@ import (
 )
 
 var NAME = "gitlab-runner"
-var VERSION = "development version"
-var REVISION = "HEAD"
-var BRANCH = "HEAD"
+var VERSION = "12.1.0"
+var REVISION = "v12.1.0"
+var BRANCH = "12-1-stable"
 var BUILT = "unknown"
 
 var AppVersion AppVersionInfo