gentoo auto-resync : 24:11:2023 - 22:37:36

1 files changed, 68 insertions, 14 deletions

diff --git a/eclass/go-env.eclass b/eclass/go-env.eclass
index ba4f6c3fbb59..1f950db06930 100644
--- a/eclass/go-env.eclass
+++ b/eclass/go-env.eclass
@@ -8,7 +8,7 @@
 # Flatcar Linux Maintainers <infra@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.
+# 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 ${_GO_ENV_ECLASS} ]]; then
@@ -19,30 +19,84 @@ inherit toolchain-funcs
 # @FUNCTION: go-env_set_compile_environment
 # @DESCRIPTION:
 # Set up basic compile environment: CC, CXX, and GOARCH.
+# Necessary platform-specific settings such as GOARM or GO386 are also set
+# according to the Portage configuration when building for those architectures.
 # Also carry over CFLAGS, LDFLAGS and friends.
 # Required for cross-compiling with crossdev.
 # If not set, host defaults will be used and the resulting binaries are host arch.
 # (e.g. "emerge-aarch64-cross-linux-gnu foo" run on x86_64 will emerge "foo" for x86_64
 #  instead of aarch64)
 go-env_set_compile_environment() {
-	local arch="$(tc-arch)"
-	case "${arch}" in
-		x86)	GOARCH="386" ;;
-		x64-*)	GOARCH="amd64" ;;
-		ppc64)	if [[ "$(tc-endian)" == "big" ]] ; then
-					GOARCH="ppc64"
-				else
-					GOARCH="ppc64le"
-				fi ;;
-			*)	GOARCH="${arch}" ;;
-	esac
-
 	tc-export CC CXX
-	export GOARCH
+
+	export GOARCH="$(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