This code is taken from dev-lang/go. No other packages have code like
this, but some erroneously call `go env GOOS`, which is bad for
cross-compiling. They should use this function instead.

Signed-off-by: James Le Cuirot <ch...@gentoo.org>
---
 eclass/go-env.eclass | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/eclass/go-env.eclass b/eclass/go-env.eclass
index c839c41be0d7e..be131133113be 100644
--- a/eclass/go-env.eclass
+++ b/eclass/go-env.eclass
@@ -48,6 +48,24 @@ go-env_set_compile_environment() {
        export CGO_LDFLAGS="${CGO_LDFLAGS:-$LDFLAGS}"
 }
 
+# @FUNCTION: go-env_goos
+# @USAGE: [toolchain prefix]
+# @DESCRIPTION:
+# Returns the appropriate GOOS setting for the target operating system.
+go-env_goos() {
+       local target=${1:-${CHOST}}
+       case "${target}" in
+               *-linux*) echo linux ;;
+               *-darwin*) echo darwin ;;
+               *-freebsd*) echo freebsd ;;
+               *-netbsd*) echo netbsd ;;
+               *-openbsd*) echo openbsd ;;
+               *-solaris*) echo solaris ;;
+               *-cygwin*|*-interix*|*-winnt*) echo windows ;;
+               *) die "unknown GOOS for ${target}" ;;
+       esac
+}
+
 # @FUNCTION: go-env_goarch
 # @USAGE: [toolchain prefix]
 # @DESCRIPTION:
-- 
2.45.2


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