From: Thilo Fromm <thilo.alexan...@gmail.com>
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.alexan...@gmail.com>
Signed-off-by: James Le Cuirot <ch...@gentoo.org>
---
eclass/go-env.eclass | 48 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100644 eclass/go-env.eclass
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
--
2.42.1
