From 266654a48bf9ccbc8f0556aa8660eaab78bb7bb9 Mon Sep 17 00:00:00 2001
From: William Hubbs <williamh@gentoo.org>
Date: Sat, 9 Apr 2016 12:35:57 -0500
Subject: [PATCH] dev-lang/go:  add support for bootstrapping with gccgo

I would like to thank Zac Medico for the patch.
This allows a user to bootstrap go with gcc's go compiler if they have it
installed.

Bug: https://bugs.gentoo.org/show_bug.cgi?id=576290

Package-Manager: portage-2.2.26
---
 dev-lang/go/go-9999.ebuild | 15 ++++++++++++---
 dev-lang/go/metadata.xml   |  3 +++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/dev-lang/go/go-9999.ebuild b/dev-lang/go/go-9999.ebuild
index ecfde4e21b2f..5a65136e3dbc 100644
--- a/dev-lang/go/go-9999.ebuild
+++ b/dev-lang/go/go-9999.ebuild
@@ -12,7 +12,7 @@ MY_PV=${PV/_/}
 inherit toolchain-funcs
 
 BOOTSTRAP_DIST="https://dev.gentoo.org/~williamh/dist"
-SRC_URI="
+SRC_URI="!gccgo? (
 kernel_Darwin? (
 	x64-macos? ( ${BOOTSTRAP_DIST}/go-darwin-amd64-bootstrap.tbz )
 )
@@ -30,6 +30,7 @@ kernel_linux? (
 kernel_SunOS? (
 	x64-solaris? ( ${BOOTSTRAP_DIST}/go-solaris-amd64-bootstrap.tbz )
 )
+)
 "
 
 if [[ ${PV} = 9999 ]]; then
@@ -52,9 +53,9 @@ HOMEPAGE="http://www.golang.org"
 
 LICENSE="BSD"
 SLOT="0/${PV}"
-IUSE=""
+IUSE="gccgo"
 
-DEPEND=""
+DEPEND="gccgo? ( >=sys-devel/gcc-5[go] )"
 RDEPEND="!<dev-go/go-tools-0_pre20150902"
 
 # These test data objects have writable/executable stacks.
@@ -146,6 +147,14 @@ src_unpack()
 src_compile()
 {
 	export GOROOT_BOOTSTRAP="${WORKDIR}"/go-$(go_os)-$(go_arch)-bootstrap
+	if use gccgo; then
+		mkdir -p "${GOROOT_BOOTSTRAP}/bin" || die
+		local go_binary=$(type -P go-5 2>/dev/null)
+		[[ -x ${go_binary} ]] || go_binary=$(
+			find "${EPREFIX}"/usr/${CHOST}/gcc-bin/*/go-5 | sort -V | tail -n1)
+		[[ -x ${go_binary} ]] || die "go-5: command not found"
+		ln -s "${go_binary}" "${GOROOT_BOOTSTRAP}/bin/go" || die
+	fi
 	export GOROOT_FINAL="${EPREFIX}"/usr/lib/go
 	export GOROOT="$(pwd)"
 	export GOBIN="${GOROOT}/bin"
diff --git a/dev-lang/go/metadata.xml b/dev-lang/go/metadata.xml
index 1050d935da86..f981de1f10bc 100644
--- a/dev-lang/go/metadata.xml
+++ b/dev-lang/go/metadata.xml
@@ -10,4 +10,7 @@
 		Rob Pike. It has garbage collection, coroutines, communication
 		channels and a clean syntax.  
 	</longdescription>
+	<use>
+		<flag name="gccgo">Enable bootstrapping using gccgo</flag>
+	</use>
 </pkgmetadata>
-- 
2.26.2