go.mk

################################################################################
#
# go
#
################################################################################

HOST_GO_VERSION = f44017549ff9
HOST_GO_SITE    = https://code.google.com/p/go
HOST_GO_SITE_METHOD = hg
HOST_GO_LICENSE = BSD
HOST_GO_LICENSE_FILES = LICENSE
GOROOT = $(HOST_DIR)/usr/lib/go
GOOS = linux
ifeq ($(BR2_arm),y)
        GOARCH = arm
endif
ifeq ($(BR2_i386),y)
        GOARCH = 386
endif
ifeq ($(BR2_x86_64),y)
        GOARCH = amd64
endif

define HOST_GO_BUILD_CMDS
        cd $(@D)/src; \
                GOROOT="$(@D)" \
                GOROOT_FINAL="$(GOROOT)" \
                GOOS="$(GOOS)" GOARCH="$(GOARCH)" \
                CC="$(HOSTCC)" \
                CC_FOR_TARGET="$(TARGET_CC)" \
                CXX_FOR_TARGET="$(TARGET_CXX)" \
                CGO_ENABLED=1 \
                bash -x ./make.bash
endef

define HOST_GO_INSTALL_CMDS
        mkdir -p $(GOROOT)
        cp -r bin include lib pkg $(GOROOT)
endef

$(eval $(host-generic-package))

I see this message with cgo enabled:

go build runtime/cgo: no buildable Go source files in /ws/mistifyio/mistify-os-buildroot/build/mistify/build/host-go-f44017549ff9/src/pkg/runtime/cgo

It comes from the Import function in src/pkg/go/build/build.go. This appears to cause the build to return 1 for failure.