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core: add support for multiple br2-external trees
Currently, we only support at most one br2-external tree. Being able
to use more than one br2-external tree can be very useful.
A use-case would be for having a br2-external to contain the basic
packages, basic board defconfigs and board files, provided by one team
responsible for the "board-bringup", while other teams consume that
br2-external as a base, and complements it each with their own set of
packages, defconfigs and extra board files.
Another use-case would be for third-parties to provide their own
Buildroot packaging in a br2-external tree, along-side the archives for
their stuff.
Finally, another use-case is to be able to add FLOSS packages in a
br2-external tree, and proprietary packages in another. This allows
to not touch the Buildroot tree at all, and still be able to get in
compliance by providing only that br2-external tree(s) that contains
FLOSS packages, leaving aside the br2-external tree(s) with the
proprietary bits.
What we do is to treat BR2_EXTERNAL as a colon-separated (space-
separated also work, and we use that internally) list of paths, on which
we iterate to construct:
- the list of all br2-external names, BR2_EXTERNAL_NAMES,
- the per-br2-external tree BR2_EXTERNAL_$(NAME) variables, which
point each to the actual location of the corresponding tree,
- the list of paths to all the external.mk files, BR2_EXTERNAL_MKS,
- the space-separated list of absolute paths to the external trees,
BR2_EXTERNAL_DIRS.
Once we have all those variables, we replace references to BR2_EXTERNAL
with either one of those.
This cascades into how we display the list of defconfigs, so that it is
easy to see what br2-external tree provides what defconfigs. As
suggested by Arnout, tweak the comment from "User-provided configs" to
"External configs", on the assumption that some br2-external trees could
be provided by vendors, so not necessarily user-provided. Ditto the menu
in Kconfig, changed from "User-provided options" to "External options".
Now, when more than one br2-external tree is used, each gets its own
sub-menu in the "User-provided options" menu. The sub-menu is labelled
with that br2-external tree's name and the sub-menu's first item is a
comment with the path to that br2-external tree.
If there's only one br2-external tree, then there is no sub-menu; there
is a single comment that contains the name and path to the br2-external
tree.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Romain Naour <romain.naour@openwide.fr>
Cc: Julien CORJON <corjon.j@ecagroup.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN
committed by
Peter Korsgaard
Peter Korsgaard
parent
a71e311df6
commit
20cd497387
57
Makefile
57
Makefile
@@ -143,7 +143,7 @@ $(if $(BASE_DIR),, $(error output directory "$(O)" does not exist))
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# Handling of BR2_EXTERNAL.
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#
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# The value of BR2_EXTERNAL is stored in .br-external in the output directory.
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# The location of the external.mk makefile fragment is computed in that file.
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# The location of the external.mk makefile fragments is computed in that file.
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# On subsequent invocations of make, this file is read in. BR2_EXTERNAL can
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# still be overridden on the command line, therefore the file is re-created
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# every time make is run.
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@@ -448,16 +448,15 @@ include boot/common.mk
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include linux/linux.mk
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include fs/common.mk
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# If using a br2-external tree, the BR2_EXTERNAL_$(NAME)_PATH variable
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# is also present in the .config file. Since .config is included after
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# we defined BR2_EXTERNAL_$(NAME)_PATH in the Makefile, the value in
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# that variable is quoted. We just include the generated Makefile fragment
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# .br2-external.mk a third time, which will set that variable to the
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# un-quoted value.
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# If using a br2-external tree, the BR2_EXTERNAL_$(NAME)_PATH variables
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# are also present in the .config file. Since .config is included after
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# we defined them in the Makefile, the values for those variables are
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# quoted. We just include the generated Makefile fragment .br2-external.mk
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# a third time, which will set those variables to the un-quoted values.
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include $(BR2_EXTERNAL_FILE)
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# Nothing to include if no BR2_EXTERNAL tree in use
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include $(BR2_EXTERNAL_MK)
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include $(BR2_EXTERNAL_MKS)
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# Now we are sure we have all the packages scanned and defined. We now
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# check for each package in the list of enabled packages, that all its
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@@ -849,7 +848,7 @@ define percent_defconfig
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@$$(COMMON_CONFIG_ENV) BR2_DEFCONFIG=$(1)/configs/$$@ \
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$$< --defconfig=$(1)/configs/$$@ $$(CONFIG_CONFIG_IN)
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endef
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$(eval $(foreach d,$(TOPDIR) $(if $(BR2_EXTERNAL_NAME),$(BR2_EXTERNAL_$(BR2_EXTERNAL_NAME)_PATH)),$(call percent_defconfig,$(d))$(sep)))
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$(eval $(foreach d,$(TOPDIR) $(BR2_EXTERNAL_DIRS),$(call percent_defconfig,$(d))$(sep)))
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savedefconfig: $(BUILD_DIR)/buildroot-config/conf prepare-kconfig
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@$(COMMON_CONFIG_ENV) $< \
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@@ -972,19 +971,33 @@ help:
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@echo 'it on-line at http://buildroot.org/docs.html'
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@echo
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# List the defconfig files
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# $(1): base directory
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# $(2): br2-external name, empty for bundled
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define list-defconfigs
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@first=true; \
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for defconfig in $(1)/configs/*_defconfig; do \
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[ -f "$${defconfig}" ] || continue; \
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if $${first}; then \
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if [ "$(2)" ]; then \
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printf "External configs in $(2):\n"; \
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else \
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printf "Built-in configs:\n"; \
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fi; \
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first=false; \
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fi; \
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defconfig="$${defconfig##*/}"; \
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printf " %-35s - Build for %s\n" "$${defconfig}" "$${defconfig%_defconfig}"; \
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done; \
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$${first} || printf "\n"
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endef
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# We iterate over BR2_EXTERNAL_NAMES rather than BR2_EXTERNAL_DIRS,
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# because we want to display the name of the br2-external tree.
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list-defconfigs:
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@echo 'Built-in configs:'
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@$(foreach b, $(sort $(notdir $(wildcard $(TOPDIR)/configs/*_defconfig))), \
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printf " %-35s - Build for %s\\n" $(b) $(b:_defconfig=);)
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ifneq ($(BR2_EXTERNAL_NAME),)
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ifneq ($(wildcard $(BR2_EXTERNAL_$(BR2_EXTERNAL_NAME)_PATH)/configs/*_defconfig),)
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@echo
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@echo 'User-provided configs:'
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@$(foreach b, $(sort $(notdir $(wildcard $(BR2_EXTERNAL_$(BR2_EXTERNAL_NAME)_PATH)/configs/*_defconfig))), \
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printf " %-35s - Build for %s\\n" $(b) $(b:_defconfig=);)
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endif
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endif
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@echo
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$(call list-defconfigs,$(TOPDIR))
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$(foreach name,$(BR2_EXTERNAL_NAMES),\
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$(call list-defconfigs,$(BR2_EXTERNAL_$(name)_PATH),$(name))$(sep))
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release: OUT = buildroot-$(BR2_VERSION)
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@@ -1003,7 +1016,7 @@ print-version:
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@echo $(BR2_VERSION_FULL)
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include docs/manual/manual.mk
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-include $(if $(BR2_EXTERNAL_NAME),$(BR2_EXTERNAL_$(BR2_EXTERNAL_NAME)_PATH)/docs/*/*.mk)
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-include $(foreach dir,$(BR2_EXTERNAL_DIRS),$(dir)/docs/*/*.mk)
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.PHONY: $(noconfig_targets)
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