package/go: make host package a virtual package

Turns host-go into a virtual package, with a single providers:

 - host-go-src, which builds host-go from source based on the same logic
   that was previously used in package/go/go/go.mk, now moved to
   package/go/go-src/go-src.mk to remove any ambiguity on the role of
   the package.

In later commits, we'll add host-go-bin a prebuilt binary host go compiler
as another provider.

A similar solution is proposed for host-rust.

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

.checkpackageignore

@@ -715,7 +715,7 @@ package/glorytun/0002-aegis256.c-fix-aarch64-build-with-uclibc.patch lib_patch.U
 package/gnu-efi/0001-Make.defaults-don-t-override-ARCH-when-cross-compili.patch lib_patch.Upstream
 package/gnupg/0001-build-Always-use-EXTERN_UNLESS_MAIN_MODULE-pattern.patch lib_patch.Upstream
 package/gnuplot/0001-configure-add-without-demo-option.patch lib_patch.Upstream
-package/go/go/0001-build.go-explicit-option-for-crosscompilation.patch lib_patch.Upstream
+package/go/go-src/0001-build.go-explicit-option-for-crosscompilation.patch lib_patch.Upstream
 package/gob2/0001-dont-include-from-prefix.patch lib_patch.Upstream
 package/gobject-introspection/0001-disable-tests.patch lib_patch.Upstream
 package/gobject-introspection/0002-Add-rpath-links-to-ccompiler.patch lib_patch.Upstream

package/go/Config.in.host

@@ -37,6 +37,30 @@ config BR2_PACKAGE_HOST_GO
 	bool
 	depends on BR2_PACKAGE_HOST_GO_HOST_ARCH_SUPPORTS
 
+if BR2_PACKAGE_HOST_GO
+
+choice
+	prompt "Go compiler variant"
+	default BR2_PACKAGE_HOST_GO_SRC
+	help
+	  Select a Go compiler variant.
+
+	  Default to 'host-go-src'.
+
+config BR2_PACKAGE_HOST_GO_SRC
+	bool "host go (source)"
+	help
+	  This package will build the go compiler for the host.
+
+endchoice
+
+config BR2_PACKAGE_PROVIDES_HOST_GO
+	string
+	# Default to host-go-src
+	default "host-go-src" if BR2_PACKAGE_HOST_GO_SRC
+
+endif
+
 source "package/go/go-bootstrap-stage1/Config.in.host"
 source "package/go/go-bootstrap-stage2/Config.in.host"
 source "package/go/go-bootstrap-stage3/Config.in.host"

package/go/go/go.mk → package/go/go-src/go-src.mk

@@ -1,21 +1,22 @@
 ################################################################################
 #
-# go
+# go-src
 #
 ################################################################################
 
-GO_SITE = https://storage.googleapis.com/golang
-GO_SOURCE = go$(GO_VERSION).src.tar.gz
+GO_SRC_SITE = https://storage.googleapis.com/golang
+GO_SRC_SOURCE = go$(GO_VERSION).src.tar.gz
 
-GO_LICENSE = BSD-3-Clause
-GO_LICENSE_FILES = LICENSE
-GO_CPE_ID_VENDOR = golang
+GO_SRC_LICENSE = BSD-3-Clause
+GO_SRC_LICENSE_FILES = LICENSE
+GO_SRC_CPE_ID_VENDOR = golang
 
-HOST_GO_DEPENDENCIES = host-go-bootstrap-stage3
+HOST_GO_SRC_PROVIDES = host-go
+HOST_GO_SRC_DEPENDENCIES = host-go-bootstrap-stage3
 
 ifeq ($(BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS),y)
 
-HOST_GO_CROSS_ENV = \
+HOST_GO_SRC_CROSS_ENV = \
 	CC_FOR_TARGET="$(TARGET_CC)" \
 	CXX_FOR_TARGET="$(TARGET_CXX)" \
 	GOOS="linux" \
@@ -28,7 +29,7 @@ endif
 
 # The go build system is not compatible with ccache, so use
 # HOSTCC_NOCCACHE.  See https://github.com/golang/go/issues/11685.
-HOST_GO_MAKE_ENV = \
+HOST_GO_SRC_MAKE_ENV = \
 	GO111MODULE=off \
 	GOCACHE=$(HOST_GO_HOST_CACHE) \
 	GOROOT_BOOTSTRAP=$(HOST_GO_BOOTSTRAP_STAGE3_ROOT) \
@@ -39,14 +40,14 @@ HOST_GO_MAKE_ENV = \
 	CC=$(HOSTCC_NOCCACHE) \
 	CXX=$(HOSTCXX_NOCCACHE) \
 	CGO_ENABLED=$(HOST_GO_CGO_ENABLED) \
-	$(HOST_GO_CROSS_ENV)
+	$(HOST_GO_SRC_CROSS_ENV)
 
-define HOST_GO_BUILD_CMDS
+define HOST_GO_SRC_BUILD_CMDS
 	cd $(@D)/src && \
-		$(HOST_GO_MAKE_ENV) ./make.bash $(if $(VERBOSE),-v)
+		$(HOST_GO_SRC_MAKE_ENV) ./make.bash $(if $(VERBOSE),-v)
 endef
 
-define HOST_GO_INSTALL_CMDS
+define HOST_GO_SRC_INSTALL_CMDS
 	$(GO_BINARIES_INSTALL)
 endef
 

package/go/go.mk

@@ -129,4 +129,6 @@ define GO_BINARIES_INSTALL
 	find $(HOST_GO_ROOT) -type f -exec touch -r $(@D)/bin/go {} \;
 endef
 
+$(eval $(host-virtual-package))
+
 include $(sort $(wildcard package/go/*/*.mk))