From 508ff6e9c3d4a55a5c0e79b69f2e5665a2267f8a Mon Sep 17 00:00:00 2001
From: Justin Cormack <justin.cormack@docker.com>
Date: Thu, 18 May 2017 15:52:32 +0100
Subject: [PATCH] Allow adding additional ldflags and other build flags

For LinuxKit we build Go executables as static pie binaries, so
need to be able to add extra build and link flags.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
---
 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 88443357d..b668d5683 100644
--- a/Makefile
+++ b/Makefile
@@ -38,7 +38,7 @@ ifeq ("$(GOOS)", "windows")
 endif
 
 GO_TAGS=$(if $(BUILDTAGS),-tags "$(BUILDTAGS)",)
-GO_LDFLAGS=-ldflags "-X $(PKG)/version.Version=$(VERSION) -X $(PKG)/version.Revision=$(REVISION) -X $(PKG)/version.Package=$(PKG)"
+GO_LDFLAGS=-ldflags "-X $(PKG)/version.Version=$(VERSION) -X $(PKG)/version.Revision=$(REVISION) -X $(PKG)/version.Package=$(PKG) $(EXTRA_LDFLAGS)"
 
 # Flags passed to `go test`
 TESTFLAGS ?=-parallel 8 -race
@@ -115,7 +115,7 @@ ineffassign: ## run ineffassign
 
 build: ## build the go packages
 	@echo "$(WHALE) $@"
-	@go build -i -v ${GO_LDFLAGS} ${GO_GCFLAGS} ${PACKAGES}
+	@go build -i -v ${EXTRA_FLAGS} ${GO_LDFLAGS} ${GO_GCFLAGS} ${PACKAGES}
 
 test: ## run tests, except integration tests and tests that require root
 	@echo "$(WHALE) $@"