commit: 878d04daaf34765e6224e58139a9c45921d7a0c3 Author: Thilo Fromm <thilo.alexander <AT> gmail <DOT> com> AuthorDate: Wed Nov 8 07:34:35 2023 +0000 Commit: James Le Cuirot <chewi <AT> gentoo <DOT> org> CommitDate: Mon Nov 20 23:25:22 2023 +0000 URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=878d04da
eclass/go-env.eclass: add helper to set compile env This change adds a helper function to explicitly set CC, CXX, and GOARCH, and carrying over CFLAGS, LDFLAGS and friends to CGO equivalents, to provide a minimal sane compile environment for Go. It enables Go builds to play nice with crossdev's wrappers for emerge/ebuild etc. Previously, Go ebuilds emitted binaries for the host architecture. For example, when running on an x86_64 host: emerge-aarch64-cross-linux-gnu foo will now correctly emerge Go package "foo" for aarch64 instead of x86_64. The eclass provides a single helper function go-env_set_compile_environment() intended to be called by other Go eclasses in an early build stage. Ebuilds may also explicitly call this function. Signed-off-by: Thilo Fromm <thilo.alexander <AT> gmail.com> Signed-off-by: James Le Cuirot <chewi <AT> gentoo.org> eclass/go-env.eclass | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/eclass/go-env.eclass b/eclass/go-env.eclass new file mode 100644 index 000000000000..ba4f6c3fbb59 --- /dev/null +++ b/eclass/go-env.eclass @@ -0,0 +1,48 @@ +# Copyright 2023 Gentoo Authors +# Distributed under the terms of the GNU General Public License v2 + +# @ECLASS: go-env.eclass +# @MAINTAINER: +# Flatcar Linux Maintainers <in...@flatcar-linux.org> +# @AUTHOR: +# Flatcar Linux Maintainers <in...@flatcar-linux.org> +# @BLURB: Helper eclass for setting the Go compile environment. Required for cross-compiling. +# @DESCRIPTION: +# This eclass includes a helper function 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 ${_GO_ENV_ECLASS} ]]; then +_GO_ENV_ECLASS=1 + +inherit toolchain-funcs + +# @FUNCTION: go-env_set_compile_environment +# @DESCRIPTION: +# Set up basic compile environment: CC, CXX, and GOARCH. +# Also carry over CFLAGS, LDFLAGS and friends. +# Required for cross-compiling with crossdev. +# If not set, host defaults will be used and the resulting binaries are host arch. +# (e.g. "emerge-aarch64-cross-linux-gnu foo" run on x86_64 will emerge "foo" for x86_64 +# instead of aarch64) +go-env_set_compile_environment() { + local arch="$(tc-arch)" + case "${arch}" in + x86) GOARCH="386" ;; + x64-*) GOARCH="amd64" ;; + ppc64) if [[ "$(tc-endian)" == "big" ]] ; then + GOARCH="ppc64" + else + GOARCH="ppc64le" + fi ;; + *) GOARCH="${arch}" ;; + esac + + tc-export CC CXX + export GOARCH + export CGO_CFLAGS="${CGO_CFLAGS:-$CFLAGS}" + export CGO_CPPFLAGS="${CGO_CPPFLAGS:-$CPPFLAGS}" + export CGO_CXXFLAGS="${CGO_CXXFLAGS:-$CXXFLAGS}" + export CGO_LDFLAGS="${CGO_LDFLAGS:-$LDFLAGS}" +} + +fi