wireguard-go-bridge: fix standalone build

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/wireguard-go-bridge/Makefile b/wireguard-go-bridge/Makefile
index 031cf8e166ba4608bd22ecb40c1b1788a2214087..b8c3ce4f8491a0c2737f71ac9bae10aa80401ad5 100644 (file)
--- a/wireguard-go-bridge/Makefile
+++ b/wireguard-go-bridge/Makefile
@@ -16,7 +16,7 @@ BUILDDIR ?= $(CONFIGURATION_TEMP_DIR)/wireguard-go-bridge
 
 UPSTREAM_FILES := $(filter-out %/main.go %/queueconstants.go,$(wildcard ../wireguard-go/*/*.go) $(wildcard ../wireguard-go/*.go)) ../wireguard-go/go.mod ../wireguard-go/go.sum
 DOWNSTREAM_FILES := $(wildcard src/*.go) $(wildcard src/*/*.go)
-CFLAGS_PREFIX := -$(DEPLOYMENT_TARGET_CLANG_FLAG_NAME)=$($(DEPLOYMENT_TARGET_CLANG_ENV_NAME)) -isysroot $(SDKROOT) -arch
+CFLAGS_PREFIX := $(if $(DEPLOYMENT_TARGET_CLANG_FLAG_NAME),-$(DEPLOYMENT_TARGET_CLANG_FLAG_NAME)=$($(DEPLOYMENT_TARGET_CLANG_ENV_NAME)),) -isysroot $(SDKROOT) -arch
 GOARCH_arm64 := arm64
 GOARCH_armv7 := arm
 GOARCH_x86_64 := amd64