[gentoo-dev] [PATCH 2/2] go-env.eclass: also set GOARM & GO386 when applicable

[WANG Xuerui <xen0n@gentoo.org>]

This is necessary for the build artifact to conform to the configured
ISA level and features on those arches. The logic is also taken from
the dev-lang/go ebuild.

Signed-off-by: WANG Xuerui <xen0n@gentoo.org>
---
 eclass/go-env.eclass | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/eclass/go-env.eclass b/eclass/go-env.eclass
index 08e3cf498a70..4bc8c4b15c65 100644
--- a/eclass/go-env.eclass
+++ b/eclass/go-env.eclass
@@ -19,6 +19,8 @@ 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.
@@ -28,6 +30,9 @@ 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=$(usex cpu_flags_x86_sse2 '' 'softfloat')
+
 	export CGO_CFLAGS="${CGO_CFLAGS:-$CFLAGS}"
 	export CGO_CPPFLAGS="${CGO_CPPFLAGS:-$CPPFLAGS}"
 	export CGO_CXXFLAGS="${CGO_CXXFLAGS:-$CXXFLAGS}"
@@ -57,4 +62,20 @@ go-env_goarch() {
 	esac
 }
 
+# @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
-- 
2.42.1