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#
# Copyright (C) 2018, 2020 Jeffery To
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
ifeq ($(origin GO_INCLUDE_DIR),undefined)
GO_INCLUDE_DIR:=$(dir $(lastword $(MAKEFILE_LIST)))
endif
# Unset environment variables
# There are more magic variables to track down, but ain't nobody got time for that
# From https://golang.org/cmd/go/#hdr-Environment_variables
# General-purpose environment variables:
unexport \
GCCGO \
GOARCH \
GOBIN \
GOCACHE \
GOMODCACHE \
GODEBUG \
GOENV \
GOFLAGS \
GOOS \
GOPATH \
GOROOT \
GOTMPDIR
# Unmodified:
# GOINSECURE
# GOPRIVATE
# GOPROXY
# GONOPROXY
# GOSUMDB
# GONOSUMDB
# GOVCS
# Environment variables for use with cgo:
unexport \
AR \
CC \
CGO_ENABLED \
CGO_CFLAGS CGO_CFLAGS_ALLOW CGO_CFLAGS_DISALLOW \
CGO_CPPFLAGS CGO_CPPFLAGS_ALLOW CGO_CPPFLAGS_DISALLOW \
CGO_CXXFLAGS CGO_CXXFLAGS_ALLOW CGO_CXXFLAGS_DISALLOW \
CGO_FFLAGS CGO_FFLAGS_ALLOW CGO_FFLAGS_DISALLOW \
CGO_LDFLAGS CGO_LDFLAGS_ALLOW CGO_LDFLAGS_DISALLOW \
CXX \
FC
# Unmodified:
# PKG_CONFIG
# Architecture-specific environment variables:
unexport \
GOARM \
GO386 \
GOMIPS \
GOMIPS64 \
GOWASM
# Special-purpose environment variables:
unexport \
GCCGOTOOLDIR \
GOROOT_FINAL \
GO_EXTLINK_ENABLED
# Unmodified:
# GIT_ALLOW_PROTOCOL
# From https://golang.org/cmd/go/#hdr-Module_support
unexport \
GO111MODULE
# From https://golang.org/pkg/runtime/#hdr-Environment_Variables
unexport \
GOGC \
GOMAXPROCS \
GORACE \
GOTRACEBACK
# From https://golang.org/cmd/cgo/#hdr-Using_cgo_with_the_go_command
unexport \
CC_FOR_TARGET \
CXX_FOR_TARGET
# Todo:
# CC_FOR_${GOOS}_${GOARCH}
# CXX_FOR_${GOOS}_${GOARCH}
# From https://golang.org/doc/install/source#environment
unexport \
GOHOSTOS \
GOHOSTARCH \
GOPPC64
# From https://golang.org/src/make.bash
unexport \
GO_GCFLAGS \
GO_LDFLAGS \
GO_LDSO \
GO_DISTFLAGS \
GOBUILDTIMELOGFILE \
GOROOT_BOOTSTRAP
# From https://golang.org/doc/go1.9#parallel-compile
unexport \
GO19CONCURRENTCOMPILATION
# From https://golang.org/src/cmd/dist/build.go
unexport \
BOOT_GO_GCFLAGS \
BOOT_GO_LDFLAGS
# From https://golang.org/src/cmd/dist/buildruntime.go
unexport \
GOEXPERIMENT
# From https://golang.org/src/cmd/dist/buildtool.go
unexport \
GOBOOTSTRAP_TOOLEXEC
# GOOS / GOARCH
go_arch=$(subst \
aarch64,arm64,$(subst \
i386,386,$(subst \
mipsel,mipsle,$(subst \
mips64el,mips64le,$(subst \
powerpc64,ppc64,$(subst \
x86_64,amd64,$(1)))))))
GO_OS:=linux
GO_ARCH:=$(call go_arch,$(ARCH))
GO_OS_ARCH:=$(GO_OS)_$(GO_ARCH)
GO_HOST_OS:=$(call tolower,$(HOST_OS))
GO_HOST_ARCH:=$(call go_arch,$(subst \
armv6l,arm,$(subst \
armv7l,arm,$(subst \
i686,i386,$(HOST_ARCH)))))
GO_HOST_OS_ARCH:=$(GO_HOST_OS)_$(GO_HOST_ARCH)
ifeq ($(GO_OS_ARCH),$(GO_HOST_OS_ARCH))
GO_HOST_TARGET_SAME:=1
else
GO_HOST_TARGET_DIFFERENT:=1
endif
ifeq ($(GO_ARCH),386)
ifeq ($(CONFIG_TARGET_x86_geode)$(CONFIG_TARGET_x86_legacy),y)
GO_386:=softfloat
else
GO_386:=sse2
endif
# -fno-plt: causes "unexpected GOT reloc for non-dynamic symbol" errors
GO_CFLAGS_TO_REMOVE:=-fno-plt
else ifeq ($(GO_ARCH),arm)
GO_TARGET_FPU:=$(word 2,$(subst +,$(space),$(call qstrip,$(CONFIG_CPU_TYPE))))
# FPU names from https://gcc.gnu.org/onlinedocs/gcc-8.4.0/gcc/ARM-Options.html#index-mfpu-1
# see also https://github.com/gcc-mirror/gcc/blob/releases/gcc-8.4.0/gcc/config/arm/arm-cpus.in
ifeq ($(GO_TARGET_FPU),)
GO_ARM:=5
else ifneq ($(filter $(GO_TARGET_FPU),vfp vfpv2),)
GO_ARM:=6
else
GO_ARM:=7
endif
else ifneq ($(filter $(GO_ARCH),mips mipsle),)
ifeq ($(CONFIG_HAS_FPU),y)
GO_MIPS:=hardfloat
else
GO_MIPS:=softfloat
endif
# -mips32r2: conflicts with -march=mips32 set by go
GO_CFLAGS_TO_REMOVE:=-mips32r2
else ifneq ($(filter $(GO_ARCH),mips64 mips64le),)
ifeq ($(CONFIG_HAS_FPU),y)
GO_MIPS64:=hardfloat
else
GO_MIPS64:=softfloat
endif
endif
# Target Go
GO_ARCH_DEPENDS:=@(aarch64||arm||i386||i686||mips||mips64||mips64el||mipsel||powerpc64||x86_64)
# ASLR/PIE
GO_PIE_SUPPORTED_OS_ARCH:= \
android_386 android_amd64 android_arm android_arm64 \
linux_386 linux_amd64 linux_arm linux_arm64 \
\
windows_386 windows_amd64 windows_arm \
\
darwin_amd64 darwin_arm64 \
\
freebsd_amd64 \
\
aix_ppc64 \
\
linux_ppc64le linux_riscv64 linux_s390x
go_pie_install_suffix=$(if $(filter $(1),aix_ppc64 windows_386 windows_amd64 windows_arm),,shared)
ifneq ($(filter $(GO_HOST_OS_ARCH),$(GO_PIE_SUPPORTED_OS_ARCH)),)
GO_HOST_PIE_SUPPORTED:=1
GO_HOST_PIE_INSTALL_SUFFIX:=$(call go_pie_install_suffix,$(GO_HOST_OS_ARCH))
endif
ifneq ($(filter $(GO_OS_ARCH),$(GO_PIE_SUPPORTED_OS_ARCH)),)
GO_TARGET_PIE_SUPPORTED:=1
GO_TARGET_PIE_INSTALL_SUFFIX:=$(call go_pie_install_suffix,$(GO_OS_ARCH))
endif
# Spectre mitigations
GO_SPECTRE_SUPPORTED_ARCH:=amd64
ifneq ($(filter $(GO_HOST_ARCH),$(GO_SPECTRE_SUPPORTED_ARCH)),)
GO_HOST_SPECTRE_SUPPORTED:=1
endif
ifneq ($(filter $(GO_ARCH),$(GO_SPECTRE_SUPPORTED_ARCH)),)
GO_TARGET_SPECTRE_SUPPORTED:=1
endif
# General build info
GO_BUILD_CACHE_DIR:=$(or $(call qstrip,$(CONFIG_GOLANG_BUILD_CACHE_DIR)),$(TMP_DIR)/go-build)
GO_MOD_CACHE_DIR:=$(DL_DIR)/go-mod-cache
GO_MOD_ARGS= \
-modcacherw
GO_GENERAL_BUILD_CONFIG_VARS= \
CONFIG_GOLANG_MOD_CACHE_WORLD_READABLE="$(CONFIG_GOLANG_MOD_CACHE_WORLD_READABLE)" \
GO_BUILD_CACHE_DIR="$(GO_BUILD_CACHE_DIR)" \
GO_MOD_CACHE_DIR="$(GO_MOD_CACHE_DIR)" \
GO_MOD_ARGS="$(GO_MOD_ARGS)"
define Go/CacheCleanup
$(GO_GENERAL_BUILD_CONFIG_VARS) \
$(SHELL) $(GO_INCLUDE_DIR)/golang-build.sh cache_cleanup
endef