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Diffstat (limited to 'eclass/go-env.eclass')
-rw-r--r-- | eclass/go-env.eclass | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/eclass/go-env.eclass b/eclass/go-env.eclass new file mode 100644 index 0000000..2cd5506 --- /dev/null +++ b/eclass/go-env.eclass @@ -0,0 +1,112 @@ +# Copyright 2023-2024 Gentoo Authors +# Distributed under the terms of the GNU General Public License v2 + +# @ECLASS: go-env.eclass +# @MAINTAINER: +# Samuel Bernardo <samuelbernardo.mail@gmail.com> +# @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 ${_GO_ENV_ECLASS} ]]; then +_GO_ENV_ECLASS=1 + +inherit flag-o-matic toolchain-funcs + +# @FUNCTION: go-env_set_compile_environment +# @DESCRIPTION: +# Set up basic compile environment: CC, CXX, and GOARCH. +# Necessary platform-specific settings such as GOARM or GO386 are also set +# according to the Portage configuration when building for those architectures. +# Also carry over CFLAGS, LDFLAGS and friends. +# Required for cross-compiling with crossdev. +# If not set, host defaults will be used and the resulting binaries are host arch. +# (e.g. "emerge-aarch64-cross-linux-gnu foo" run on x86_64 will emerge "foo" for x86_64 +# instead of aarch64) +go-env_set_compile_environment() { + tc-export CC CXX PKG_CONFIG + + export GOARCH="$(go-env_goarch)" + use arm && export GOARM=$(go-env_goarm) + use x86 && export GO386=$(go-env_go386) + + # XXX: Hack for checking ICE (bug #912152, gcc PR113204) + case ${EAPI} in + 6) + has_version "sys-devel/gcc[debug]" && filter-lto + ;; + *) + has_version -b "sys-devel/gcc[debug]" && filter-lto + ;; + esac + + export CGO_CFLAGS="${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 |