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# Copyright 2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: go-env.eclass
# @MAINTAINER:
# Flatcar Linux Maintainers <infra@flatcar-linux.org>
# @AUTHOR:
# Flatcar Linux Maintainers <infra@flatcar-linux.org>
# @BLURB: Helper eclass for setting the Go compile environment. Required for cross-compiling.
# @DESCRIPTION:
# This eclass includes helper functions for setting the compile environment for Go ebuilds.
# Intended to be called by other Go eclasses in an early build stage, e.g. src_unpack.
if [[ -z ${_GO_ENV_ECLASS} ]]; then
_GO_ENV_ECLASS=1
inherit toolchain-funcs
# @FUNCTION: go-env_set_compile_environment
# @DESCRIPTION:
# Set up basic compile environment: CC, CXX, and GOARCH.
# Necessary platform-specific settings such as GOARM or GO386 are also set
# according to the Portage configuration when building for those architectures.
# Also carry over CFLAGS, LDFLAGS and friends.
# Required for cross-compiling with crossdev.
# If not set, host defaults will be used and the resulting binaries are host arch.
# (e.g. "emerge-aarch64-cross-linux-gnu foo" run on x86_64 will emerge "foo" for x86_64
# instead of aarch64)
go-env_set_compile_environment() {
tc-export CC CXX
export GOARCH="$(go-env_goarch)"
use arm && export GOARM=$(go-env_goarm)
use x86 && export GO386=$(go-env_go386)
export CGO_CFLAGS="${CGO_CFLAGS:-$CFLAGS}"
export CGO_CPPFLAGS="${CGO_CPPFLAGS:-$CPPFLAGS}"
export CGO_CXXFLAGS="${CGO_CXXFLAGS:-$CXXFLAGS}"
export CGO_LDFLAGS="${CGO_LDFLAGS:-$LDFLAGS}"
}
# @FUNCTION: go-env_goarch
# @USAGE: [toolchain prefix]
# @DESCRIPTION:
# Returns the appropriate GOARCH setting for the target architecture.
go-env_goarch() {
# By chance most portage arch names match Go
local tc_arch=$(tc-arch $@)
case "${tc_arch}" in
x86) echo 386;;
x64-*) echo amd64;;
loong) echo loong64;;
mips) if use abi_mips_o32; then
[[ $(tc-endian $@) = big ]] && echo mips || echo mipsle
elif use abi_mips_n64; then
[[ $(tc-endian $@) = big ]] && echo mips64 || echo mips64le
fi ;;
ppc64) [[ $(tc-endian $@) = big ]] && echo ppc64 || echo ppc64le ;;
riscv) echo riscv64 ;;
s390) echo s390x ;;
*) echo "${tc_arch}";;
esac
}
# @FUNCTION: go-env_go386
# @DESCRIPTION:
# Returns the appropriate GO386 setting for the CFLAGS in use.
go-env_go386() {
# Piggy-back off any existing CPU_FLAGS_X86 usage in the ebuild if
# it's there.
if in_iuse cpu_flags_x86_sse2 && use cpu_flags_x86_sse2 ; then
echo 'sse2'
return
fi
if tc-cpp-is-true "defined(__SSE2__)" ${CFLAGS} ${CXXFLAGS} ; then
echo 'sse2'
return
fi
# Go 1.16 dropped explicit support for 386 FP and relies on software
# emulation instead in the absence of SSE2.
echo 'softfloat'
}
# @FUNCTION: go-env_goarm
# @USAGE: [CHOST-value]
# @DESCRIPTION:
# Returns the appropriate GOARM setting for the CHOST given, or the default
# CHOST.
go-env_goarm() {
case "${1:-${CHOST}}" in
armv5*) echo 5;;
armv6*) echo 6;;
armv7*) echo 7;;
*)
die "unknown GOARM for ${1:-${CHOST}}"
;;
esac
}
fi
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