Add buildmode=pie to makefile

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

.travis.yml

@@ -49,8 +49,6 @@ script:
   - export CGO_ENABLED=$TRAVIS_CGO_ENABLED
   - GIT_CHECK_EXCLUDE="./vendor" TRAVIS_COMMIT_RANGE="${TRAVIS_COMMIT_RANGE/.../..}" make dco
   - make fmt
-# FIXME: For non-linux GOOS, without running `go build -i`, vet fails with `vet: import failed: can't find import: fmt`...
-# Note that `go build -i` requires write permission to GOROOT. (So it is not called in Makefile)
   - go build -i .
   - make setup
   - make lint

Makefile

@@ -45,6 +45,7 @@ GO_TAGS=$(if $(BUILDTAGS),-tags "$(BUILDTAGS)",)
 GO_LDFLAGS=-ldflags "-X $(PKG)/version.Version=$(VERSION) -X $(PKG)/version.Revision=$(REVISION) -X $(PKG)/version.Package=$(PKG) $(EXTRA_LDFLAGS)"
 
 TESTFLAGS_RACE=
+GO_GCFLAGS=
 
 #Detect the target os
 include Makefile.OS

Makefile.darwin

@@ -2,6 +2,6 @@
 COMMANDS += containerd-shim
 
 # amd64 supports go test -race
-ifeq ("amd64", $(GOARCH))
+ifeq ($(GOARCH),amd64)
 	TESTFLAGS_RACE= -race
 endif

Makefile.freebsd

@@ -2,6 +2,6 @@
 COMMANDS += containerd-shim
 
 # amd64 supports go test -race
-ifeq ("amd64", $(GOARCH))
+ifeq ($(GOARCH),amd64)
 	TESTFLAGS_RACE= -race
 endif

Makefile.linux

@@ -1,7 +1,12 @@
 #linux specific settings
 COMMANDS += containerd-shim
 
+# check GOOS for cross compile builds
+ifeq ($(GOOS),linux)
+	GO_GCFLAGS= -buildmode=pie
+endif
+
 # amd64 supports go test -race
-ifeq ("amd64", $(GOARCH))
+ifeq ($(GOARCH),amd64)
 	TESTFLAGS_RACE= -race
 endif

Makefile.windows

@@ -6,6 +6,6 @@ FIX_PATH = $(subst /,\,$1)
 BINARY_SUFFIX=".exe"
 
 # amd64 supports go test -race
-ifeq ("amd64", $(GOARCH))
+ifeq ($(GOARCH),amd64)
 	TESTFLAGS_RACE= -race
 endif