[Buildroot] [[PATCH v2 1/2] package/pkg-golang: add support for building host packages

[Angelo Compagnucci <angelo@amarulasolutions.com>]

On Mon, Aug 27, 2018 at 1:37 PM, Mirza Krak <mirza.krak@northern.tech> wrote:
> With this you can add:
>
>     $(eval $(host-golang-package))
>
> to a package .mk file to build for host.
>
> Signed-off-by: Mirza Krak <mirza.krak@northern.tech>
> ---

Acked-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Tested-by: Angelo Compagnucci <angelo@amarulasolutions.com>

>
> Changes in v2:
>     - Added entry in Buildroot manual
>     - Install to $(HOST_DIR)/bin instead of $(HOST_DIR)/usr/bin
>     - Created "GO_COMMON_ENV" to be shared between GO_TARGET_ENV and GO_HOST_ENV
>     - Dropped accidental change of comment
>     - Removed a empty line
>
>  docs/manual/adding-packages-golang.txt |  5 +++--
>  package/pkg-golang.mk                  | 37 +++++++++++++++++++++++++++++++---
>  2 files changed, 37 insertions(+), 5 deletions(-)
>
> diff --git a/docs/manual/adding-packages-golang.txt b/docs/manual/adding-packages-golang.txt
> index efcf696867..94520480ce 100644
> --- a/docs/manual/adding-packages-golang.txt
> +++ b/docs/manual/adding-packages-golang.txt
> @@ -50,8 +50,9 @@ and +BR2_PACKAGE_HOST_GO_CGO_LINKING_SUPPORTS+ because Buildroot will
>  automatically add a dependency on +host-go+ to such packages.
>
>  The main macro of the Go package infrastructure is
> -+golang-package+. It is similar to the +generic-package+ macro. Only
> -target packages are supported with +golang-package+.
> ++golang-package+. It is similar to the +generic-package+ macro. The
> +ability to build host packages is also available, with the
> ++host-golang-package+ macro.
>
>  Just like the generic infrastructure, the Go infrastructure works
>  by defining a number of variables before calling the +golang-package+.
> diff --git a/package/pkg-golang.mk b/package/pkg-golang.mk
> index 6eacd14180..878228ce74 100644
> --- a/package/pkg-golang.mk
> +++ b/package/pkg-golang.mk
> @@ -25,12 +25,18 @@ GO_BIN = $(HOST_DIR)/bin/go
>
>  # We pass an empty GOBIN, otherwise "go install: cannot install
>  # cross-compiled binaries when GOBIN is set"
> -GO_TARGET_ENV = \
> -       $(HOST_GO_TARGET_ENV) \
> +GO_COMMON_ENV = \
>         PATH=$(BR_PATH) \
>         GOBIN= \
>         CGO_ENABLED=$(HOST_GO_CGO_ENABLED)
>
> +GO_TARGET_ENV = \
> +       $(HOST_GO_TARGET_ENV) \
> +       $(GO_COMMON_ENV)
> +
> +GO_HOST_ENV = \
> +       $(GO_COMMON_ENV)
> +
>  ################################################################################
>  # inner-golang-package -- defines how the configuration, compilation and
>  # installation of a Go package should be done, implements a few hooks to tune
> @@ -44,7 +50,6 @@ GO_TARGET_ENV = \
>  #             packages
>  #  argument 4 is the type (target or host)
>  #
> -# NOTE Only type target is supported at the moment
>  ################################################################################
>
>  define inner-golang-package
> @@ -96,6 +101,8 @@ endif
>  # Build step. Only define it if not already defined by the package .mk
>  # file.
>  ifndef $(2)_BUILD_CMDS
> +ifeq ($(4),target)
> +# Build package for target
>  define $(2)_BUILD_CMDS
>         $$(foreach d,$$($(2)_BUILD_TARGETS),\
>                 cd $$($(2)_SRC_PATH); \
> @@ -107,6 +114,20 @@ define $(2)_BUILD_CMDS
>                         ./$$(d)
>         )
>  endef
> +else
> +# Build package for host
> +define $(2)_BUILD_CMDS
> +       $$(foreach d,$$($(2)_BUILD_TARGETS),\
> +               cd $$($(2)_SRC_PATH); \
> +               $$(GO_HOST_ENV) \
> +                       GOPATH="$$(@D)/$$($(2)_WORKSPACE)" \
> +                       $$($(2)_GO_ENV) \
> +                       $$(GO_BIN) build -v $$($(2)_BUILD_OPTS) \
> +                       -o $$(@D)/bin/$$(or $$($(2)_BIN_NAME),$$(notdir $$(d))) \
> +                       ./$$(d)
> +       )
> +endef
> +endif
>  endif
>
>  # Target installation step. Only define it if not already defined by the
> @@ -119,6 +140,15 @@ define $(2)_INSTALL_TARGET_CMDS
>  endef
>  endif
>
> +# Host installation step
> +ifndef $(2)_INSTALL_CMDS
> +define $(2)_INSTALL_CMDS
> +       $$(foreach d,$$($(2)_INSTALL_BINS),\
> +               $(INSTALL) -D -m 0755 $$(@D)/bin/$$(d) $(HOST_DIR)/bin/$$(d)
> +       )
> +endef
> +endif
> +
>  # Call the generic package infrastructure to generate the necessary make
>  # targets
>  $(call inner-generic-package,$(1),$(2),$(3),$(4))
> @@ -130,3 +160,4 @@ endef # inner-golang-package
>  ################################################################################
>
>  golang-package = $(call inner-golang-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
> +host-golang-package = $(call inner-golang-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)
> --
> 2.11.0
>
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