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234 lines
5.2 KiB
234 lines
5.2 KiB
#
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# Copyright (C) 2018, 2020 Jeffery To
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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ifeq ($(origin GO_INCLUDE_DIR),undefined)
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GO_INCLUDE_DIR:=$(dir $(lastword $(MAKEFILE_LIST)))
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endif
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# Unset environment variables
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# There are more magic variables to track down, but ain't nobody got time for that
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# From https://golang.org/cmd/go/#hdr-Environment_variables
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# General-purpose environment variables:
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unexport \
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GCCGO \
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GOARCH \
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GOBIN \
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GOCACHE \
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GODEBUG \
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GOENV \
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GOFLAGS \
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GOOS \
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GOPATH \
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GOROOT \
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GOTMPDIR
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# Unmodified:
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# GOPRIVATE
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# GOPROXY
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# GONOPROXY
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# GOSUMDB
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# GONOSUMDB
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# Environment variables for use with cgo:
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unexport \
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AR \
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CC \
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CGO_ENABLED \
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CGO_CFLAGS CGO_CFLAGS_ALLOW CGO_CFLAGS_DISALLOW \
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CGO_CPPFLAGS CGO_CPPFLAGS_ALLOW CGO_CPPFLAGS_DISALLOW \
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CGO_CXXFLAGS CGO_CXXFLAGS_ALLOW CGO_CXXFLAGS_DISALLOW \
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CGO_FFLAGS CGO_FFLAGS_ALLOW CGO_FFLAGS_DISALLOW \
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CGO_LDFLAGS CGO_LDFLAGS_ALLOW CGO_LDFLAGS_DISALLOW \
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CXX \
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FC
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# Unmodified:
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# PKG_CONFIG
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# Architecture-specific environment variables:
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unexport \
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GOARM \
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GO386 \
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GOMIPS \
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GOMIPS64 \
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GOWASM
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# Special-purpose environment variables:
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unexport \
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GCCGOTOOLDIR \
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GOROOT_FINAL \
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GO_EXTLINK_ENABLED
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# Unmodified:
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# GIT_ALLOW_PROTOCOL
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# From https://golang.org/cmd/go/#hdr-Module_support
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unexport \
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GO111MODULE
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# From https://golang.org/pkg/runtime/#hdr-Environment_Variables
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unexport \
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GOGC \
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GOMAXPROCS \
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GORACE \
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GOTRACEBACK
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# From https://golang.org/cmd/cgo/#hdr-Using_cgo_with_the_go_command
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unexport \
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CC_FOR_TARGET \
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CXX_FOR_TARGET
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# Todo:
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# CC_FOR_${GOOS}_${GOARCH}
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# CXX_FOR_${GOOS}_${GOARCH}
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# From https://golang.org/doc/install/source#environment
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unexport \
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GOHOSTOS \
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GOHOSTARCH \
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GOPPC64
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# From https://golang.org/src/make.bash
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unexport \
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GO_GCFLAGS \
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GO_LDFLAGS \
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GO_LDSO \
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GO_DISTFLAGS \
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GOBUILDTIMELOGFILE \
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GOROOT_BOOTSTRAP
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# From https://golang.org/doc/go1.9#parallel-compile
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unexport \
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GO19CONCURRENTCOMPILATION
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# From https://golang.org/src/cmd/dist/build.go
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unexport \
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BOOT_GO_GCFLAGS \
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BOOT_GO_LDFLAGS
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# From https://golang.org/src/cmd/dist/buildtool.go
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unexport \
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GOBOOTSTRAP_TOOLEXEC
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# From https://golang.org/src/cmd/internal/objabi/util.go
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unexport \
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GOEXPERIMENT
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# GOOS / GOARCH
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go_arch=$(subst \
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aarch64,arm64,$(subst \
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i386,386,$(subst \
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mipsel,mipsle,$(subst \
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mips64el,mips64le,$(subst \
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powerpc64,ppc64,$(subst \
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x86_64,amd64,$(1)))))))
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GO_OS:=linux
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GO_ARCH:=$(call go_arch,$(ARCH))
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GO_OS_ARCH:=$(GO_OS)_$(GO_ARCH)
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GO_HOST_OS:=$(call tolower,$(HOST_OS))
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GO_HOST_ARCH:=$(call go_arch,$(subst \
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armv6l,arm,$(subst \
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armv7l,arm,$(subst \
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i686,i386,$(HOST_ARCH)))))
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GO_HOST_OS_ARCH:=$(GO_HOST_OS)_$(GO_HOST_ARCH)
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ifeq ($(GO_OS_ARCH),$(GO_HOST_OS_ARCH))
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GO_HOST_TARGET_SAME:=1
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else
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GO_HOST_TARGET_DIFFERENT:=1
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endif
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ifeq ($(GO_ARCH),386)
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# ensure binaries can run on older CPUs
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GO_386:=387
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# -fno-plt: causes "unexpected GOT reloc for non-dynamic symbol" errors
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GO_CFLAGS_TO_REMOVE:=-fno-plt
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else ifeq ($(GO_ARCH),arm)
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GO_TARGET_FPU:=$(word 2,$(subst +,$(space),$(call qstrip,$(CONFIG_CPU_TYPE))))
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# FPU names from https://gcc.gnu.org/onlinedocs/gcc-8.3.0/gcc/ARM-Options.html#index-mfpu-1
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# see also https://github.com/gcc-mirror/gcc/blob/gcc-8_3_0-release/gcc/config/arm/arm-cpus.in
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#
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# Assumptions:
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#
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# * -d16 variants (16 instead of 32 double-precision registers) acceptable
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# Go doesn't appear to check the HWCAP_VFPv3D16 flag in
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# https://github.com/golang/go/blob/release-branch.go1.13/src/runtime/os_linux_arm.go
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#
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# * Double-precision required
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# Based on no evidence(!)
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# Excludes vfpv3xd, vfpv3xd-fp16, fpv4-sp-d16, fpv5-sp-d16
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GO_ARM_7_FPUS:= \
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vfpv3 vfpv3-fp16 vfpv3-d16 vfpv3-d16-fp16 neon neon-vfpv3 neon-fp16 \
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vfpv4 vfpv4-d16 neon-vfpv4 \
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fpv5-d16 fp-armv8 neon-fp-armv8 crypto-neon-fp-armv8
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GO_ARM_6_FPUS:=vfp vfpv2
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ifneq ($(filter $(GO_TARGET_FPU),$(GO_ARM_7_FPUS)),)
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GO_ARM:=7
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else ifneq ($(filter $(GO_TARGET_FPU),$(GO_ARM_6_FPUS)),)
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GO_ARM:=6
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else
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GO_ARM:=5
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endif
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else ifneq ($(filter $(GO_ARCH),mips mipsle),)
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ifeq ($(CONFIG_HAS_FPU),y)
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GO_MIPS:=hardfloat
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else
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GO_MIPS:=softfloat
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endif
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# -mips32r2: conflicts with -march=mips32 set by go
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GO_CFLAGS_TO_REMOVE:=-mips32r2
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else ifneq ($(filter $(GO_ARCH),mips64 mips64le),)
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ifeq ($(CONFIG_HAS_FPU),y)
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GO_MIPS64:=hardfloat
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else
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GO_MIPS64:=softfloat
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endif
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endif
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# Target Go
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GO_ARCH_DEPENDS:=@(aarch64||arm||i386||i686||mips||mips64||mips64el||mipsel||powerpc64||x86_64)
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# ASLR/PIE
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GO_PIE_SUPPORTED_OS_ARCH:= \
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android_386 android_amd64 android_arm android_arm64 \
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linux_386 linux_amd64 linux_arm linux_arm64 \
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\
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darwin_amd64 \
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freebsd_amd64 \
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\
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aix_ppc64 \
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\
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linux_ppc64le linux_s390x
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go_pie_install_suffix=$(if $(filter $(1),aix_ppc64),,shared)
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ifneq ($(filter $(GO_HOST_OS_ARCH),$(GO_PIE_SUPPORTED_OS_ARCH)),)
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GO_HOST_PIE_SUPPORTED:=1
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GO_HOST_PIE_INSTALL_SUFFIX:=$(call go_pie_install_suffix,$(GO_HOST_OS_ARCH))
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endif
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ifneq ($(filter $(GO_OS_ARCH),$(GO_PIE_SUPPORTED_OS_ARCH)),)
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GO_TARGET_PIE_SUPPORTED:=1
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GO_TARGET_PIE_INSTALL_SUFFIX:=$(call go_pie_install_suffix,$(GO_OS_ARCH))
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endif
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