################################################################################
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# Golang package infrastructure
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#
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# This file implements an infrastructure that eases development of package .mk
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# files for Go packages. It should be used for all packages that are written in
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# go.
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#
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# See the Buildroot documentation for details on the usage of this
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# infrastructure
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#
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#
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# In terms of implementation, this golang infrastructure requires the .mk file
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# to only specify metadata information about the package: name, version,
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# download URL, etc.
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#
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# We still allow the package .mk file to override what the different steps are
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# doing, if needed. For example, if <PKG>_BUILD_CMDS is already defined, it is
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# used as the list of commands to perform to build the package, instead of the
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# default golang behavior. The package can also define some post operation
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# hooks.
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#
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################################################################################
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GO_BIN = $(HOST_DIR)/bin/go
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################################################################################
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# inner-golang-package -- defines how the configuration, compilation and
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# installation of a Go package should be done, implements a few hooks to tune
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# the build process for Go specificities and calls the generic package
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# infrastructure to generate the necessary make targets
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#
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# argument 1 is the lowercase package name
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# argument 2 is the uppercase package name, including a HOST_ prefix for host
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# packages
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# argument 3 is the uppercase package name, without the HOST_ prefix for host
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# packages
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# argument 4 is the type (target or host)
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#
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################################################################################
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define inner-golang-package
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$(2)_BUILD_OPTS += \
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-ldflags "$$($(2)_LDFLAGS)" \
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-tags "$$($(2)_TAGS)" \
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-trimpath \
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-p $(PARALLEL_JOBS)
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# Target packages need the Go compiler on the host.
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$(2)_DEPENDENCIES += host-go
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$(2)_BUILD_TARGETS ?= .
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# If the build target is just ".", then we assume the binary to be
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# produced is named after the package. If however, a build target has
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# been specified, we assume that the binaries to be produced are named
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# after each build target building them (below in <pkg>_BUILD_CMDS).
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ifeq ($$($(2)_BUILD_TARGETS),.)
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$(2)_BIN_NAME ?= $(1)
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endif
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$(2)_INSTALL_BINS ?= $(1)
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# Source files in Go usually use an import path resolved around
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# domain/vendor/software. We infer domain/vendor/software from the upstream URL
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# of the project.
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$(2)_SRC_DOMAIN = $$(call domain,$$($(2)_SITE))
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$(2)_SRC_VENDOR = $$(word 1,$$(subst /, ,$$(call notdomain,$$($(2)_SITE))))
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$(2)_SRC_SOFTWARE = $$(word 2,$$(subst /, ,$$(call notdomain,$$($(2)_SITE))))
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# $(2)_GOMOD is the root Go module path for the project, inferred if not set.
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# If the go.mod file does not exist, one is written with this root path.
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$(2)_GOMOD ?= $$($(2)_SRC_DOMAIN)/$$($(2)_SRC_VENDOR)/$$($(2)_SRC_SOFTWARE)
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# Generate a go.mod file if it doesn't exist. Note: Go is configured
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# to use the "vendor" dir and not make network calls.
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define $(2)_GEN_GOMOD
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if [ ! -f $$(@D)/go.mod ]; then \
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printf "module $$($(2)_GOMOD)\n" > $$(@D)/go.mod; \
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fi
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endef
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$(2)_POST_PATCH_HOOKS += $(2)_GEN_GOMOD
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# Build step. Only define it if not already defined by the package .mk
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# file.
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ifndef $(2)_BUILD_CMDS
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ifeq ($(4),target)
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ifeq ($(BR2_STATIC_LIBS),y)
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$(2)_LDFLAGS += -extldflags '-static'
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endif
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# Build package for target
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define $(2)_BUILD_CMDS
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$$(foreach d,$$($(2)_BUILD_TARGETS),\
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cd $$(@D); \
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$$(HOST_GO_TARGET_ENV) \
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$$($(2)_GO_ENV) \
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$$(GO_BIN) build -v $$($(2)_BUILD_OPTS) \
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-o $$(@D)/bin/$$(or $$($(2)_BIN_NAME),$$(notdir $$(d))) \
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$$($(2)_GOMOD)/$$(d)
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)
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endef
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else
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# Build package for host
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define $(2)_BUILD_CMDS
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$$(foreach d,$$($(2)_BUILD_TARGETS),\
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cd $$(@D); \
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$$(HOST_GO_HOST_ENV) \
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$$($(2)_GO_ENV) \
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$$(GO_BIN) build -v $$($(2)_BUILD_OPTS) \
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-o $$(@D)/bin/$$(or $$($(2)_BIN_NAME),$$(notdir $$(d))) \
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$$($(2)_GOMOD)/$$(d)
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)
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endef
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endif
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endif
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# Target installation step. Only define it if not already defined by the
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# package .mk file.
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ifndef $(2)_INSTALL_TARGET_CMDS
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define $(2)_INSTALL_TARGET_CMDS
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$$(foreach d,$$($(2)_INSTALL_BINS),\
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$(INSTALL) -D -m 0755 $$(@D)/bin/$$(d) $$(TARGET_DIR)/usr/bin/$$(d)
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)
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endef
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endif
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# Host installation step
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ifndef $(2)_INSTALL_CMDS
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define $(2)_INSTALL_CMDS
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$$(foreach d,$$($(2)_INSTALL_BINS),\
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$(INSTALL) -D -m 0755 $$(@D)/bin/$$(d) $$(HOST_DIR)/bin/$$(d)
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)
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endef
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endif
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# Call the generic package infrastructure to generate the necessary make
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# targets
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$(call inner-generic-package,$(1),$(2),$(3),$(4))
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endef # inner-golang-package
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################################################################################
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# golang-package -- the target generator macro for Go packages
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################################################################################
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golang-package = $(call inner-golang-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
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host-golang-package = $(call inner-golang-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)
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