[OE-core] [PATCH v3] go: ensure use of BUILD_CC when building bootstrap tools

[Matt Madison]

For cross-canadian builds, we were accidentally using
the crosssdk C compiler when building the Go compiler
bootstrap.  Add a patch to the make script to let us
use BUILD_CC, and prepend do_compile to set it in
the local environment to ensure that the trailing
blank gets stripped, since that confuses Go.

[YOCTO #12341]

Signed-off-by: Matt Madison <matt at madison.systems>
---
 meta/recipes-devtools/go/go-1.9.inc                |  1 +
 ...verride-CC-when-building-dist-and-go_boot.patch | 43 ++++++++++++++++++++++
 meta/recipes-devtools/go/go-common.inc             |  4 ++
 3 files changed, 48 insertions(+)
 create mode 100644 meta/recipes-devtools/go/go-1.9/0010-make.bash-override-CC-when-building-dist-and-go_boot.patch

diff --git a/meta/recipes-devtools/go/go-1.9.inc b/meta/recipes-devtools/go/go-1.9.inc
index 65adaa8..1dbb5ef 100644
--- a/meta/recipes-devtools/go/go-1.9.inc
+++ b/meta/recipes-devtools/go/go-1.9.inc
@@ -15,6 +15,7 @@ SRC_URI += "\
         file://0007-ld-add-soname-to-shareable-objects.patch \
         file://0008-make.bash-add-GOHOSTxx-indirection-for-cross-canadia.patch \
         file://0009-cmd-go-buildmode-pie-forces-external-linking-mode-on.patch \
+        file://0010-make.bash-override-CC-when-building-dist-and-go_boot.patch \
 "
 SRC_URI[main.md5sum] = "da2d44ea384076efec43ee1f8b7d45d2"
 SRC_URI[main.sha256sum] = "a4ab229028ed167ba1986825751463605264e44868362ca8e7accc8be057e993"
diff --git a/meta/recipes-devtools/go/go-1.9/0010-make.bash-override-CC-when-building-dist-and-go_boot.patch b/meta/recipes-devtools/go/go-1.9/0010-make.bash-override-CC-when-building-dist-and-go_boot.patch
new file mode 100644
index 0000000..83fd78c
--- /dev/null
+++ b/meta/recipes-devtools/go/go-1.9/0010-make.bash-override-CC-when-building-dist-and-go_boot.patch
@@ -0,0 +1,43 @@
+From 21d83dd9499e5be30eea28dd7034d1ea2a01c838 Mon Sep 17 00:00:00 2001
+From: Matt Madison <matt at madison.systems>
+Date: Tue, 14 Nov 2017 07:38:42 -0800
+Subject: [PATCH 10/10] make.bash: override CC when building dist and
+ go_bootstrap
+
+For cross-canadian builds, dist and go_bootstrap
+run on the build host, so CC needs to point to the
+build host's C compiler.  Add a BUILD_CC environment
+for this, falling back to $CC if not present.
+
+Upstream-Status: Pending
+
+Signed-off-by: Matt Madison <matt at madison.systems>
+---
+ src/make.bash | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/make.bash b/src/make.bash
+index 0bdadc6..f199349 100755
+--- a/src/make.bash
++++ b/src/make.bash
+@@ -131,7 +131,7 @@ if [ "$GOROOT_BOOTSTRAP" = "$GOROOT" ]; then
+ 	exit 1
+ fi
+ rm -f cmd/dist/dist
+-GOROOT="$GOROOT_BOOTSTRAP" GOOS="" GOARCH="" "$GOROOT_BOOTSTRAP/bin/go" build -o cmd/dist/dist ./cmd/dist
++CC=${BUILD_CC:-${CC}} GOROOT="$GOROOT_BOOTSTRAP" GOOS="" GOARCH="" "$GOROOT_BOOTSTRAP/bin/go" build -o cmd/dist/dist ./cmd/dist
+ 
+ # -e doesn't propagate out of eval, so check success by hand.
+ eval $(./cmd/dist/dist env -p || echo FAIL=true)
+@@ -167,7 +167,7 @@ elif [ "$1" = "--host-only" ]; then
+ fi
+ 
+ if [ "$do_host_build" = "yes" ]; then
+-	./cmd/dist/dist bootstrap $buildall $GO_DISTFLAGS -v # builds go_bootstrap
++	CC=${BUILD_CC:-${CC}} ./cmd/dist/dist bootstrap $buildall $GO_DISTFLAGS -v # builds go_bootstrap
+ 	# Delay move of dist tool to now, because bootstrap may clear tool directory.
+ 	mv cmd/dist/dist "$GOTOOLDIR"/dist
+ 	echo
+-- 
+2.7.4
+
diff --git a/meta/recipes-devtools/go/go-common.inc b/meta/recipes-devtools/go/go-common.inc
index ce1eb86..9af6873 100644
--- a/meta/recipes-devtools/go/go-common.inc
+++ b/meta/recipes-devtools/go/go-common.inc
@@ -20,3 +20,7 @@ B = "${S}"
 
 INHIBIT_PACKAGE_DEBUG_SPLIT = "1"
 SSTATE_SCAN_CMD = "true"
+
+do_compile_prepend() {
+	BUILD_CC=${BUILD_CC}
+}
-- 
2.7.4