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1f6b283dd9
Setting an unset variable to an empty value is useless in make; an unset
variable just expands to an empty string anyway. So what we do currently
has no side effect:
variable set and not empty -> variable not modified
variable set and empty -> variable not modified
variable unset -> set to an empty string
However, additional variables do have an impact on the parsing time of
the Makefiles, and the more variables, the more collisions in the hash
table used internally by make, which slows down the parsing.
By dropping those conditionally-set-empty variables, we gain about 3%:
Run Before After
1 5.572 5.325
2 5.434 5.354
3 5.490 5.320
4 5.525 5.330
5 5.476 5.330
6 5.511 5.434
7 5.498 5.388
8 5.524 5.371
9 5.479 5.346
10 5.637 5.324
Mean: 5.515 5.352
Yeah, 0.163s does not look like much, and this does not make
autocompletion any more usable. Still, that 3% gain is not to be
ashamed of either.
Note that there are 3 others case where we do set empty variables, but
those are unconditional and serve other purposes:
- pkg-virtual: this is done on purpose to avoid a bug when the
environment may have TOOLCHAIN_VERSION or _SOURCE set, and we really
want those to be empty, so the assignment is not conditional;
- pkg-python: the reason for setting those to empty is dubious at
best; it's been there since the inception of the python infra, back
in 2013; still, the case is different than this patch addresses;
- pkg-toolchain-external: this is the case for a toolchain already
installed, so indeed we want to set _SOURCE and _VERSION to empty.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
336 lines
14 KiB
Makefile
336 lines
14 KiB
Makefile
################################################################################
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# Kconfig package infrastructure
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#
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# This file implements an infrastructure that eases development of
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# package .mk files for packages that use kconfig for configuration files.
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# It is based on the generic-package infrastructure, and inherits all of its
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# features.
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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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# Macro to update back the custom (def)config file
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# Must only be called if $(PKG)_KCONFIG_FILE is set and $(PKG)_KCONFIG_DEFCONFIG)
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# is not set.
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# $(1): file to copy from
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define kconfig-package-update-config
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@$(if $($(PKG)_KCONFIG_FRAGMENT_FILES), \
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echo "Unable to perform $(@) when fragment files are set"; exit 1)
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$(Q)if [ -d $($(PKG)_KCONFIG_FILE) ]; then \
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echo "Unable to perform $(@) when $($(PKG)_KCONFIG_FILE) is a directory"; \
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exit 1; \
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fi
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$(Q)mkdir -p $(dir $($(PKG)_KCONFIG_FILE))
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cp -f $($(PKG)_DIR)/$(1) $($(PKG)_KCONFIG_FILE)
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$(Q)touch --reference $($(PKG)_DIR)/$($(PKG)_KCONFIG_STAMP_DOTCONFIG) $($(PKG)_KCONFIG_FILE)
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endef
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PKG_KCONFIG_COMMON_OPTS = \
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HOSTCC="$(HOSTCC_NOCCACHE)"
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# Macro to save the defconfig file
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# $(1): the name of the package in upper-case letters
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define kconfig-package-savedefconfig
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$($(1)_MAKE_ENV) $($(1)_MAKE) -C $($(1)_DIR) \
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$(PKG_KCONFIG_COMMON_OPTS) $($(1)_KCONFIG_OPTS) savedefconfig
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endef
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# The correct way to regenerate a .config file is to use 'make olddefconfig'.
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# For historical reasons, the target name is 'oldnoconfig' between Linux kernel
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# versions 2.6.36 and 3.6, and remains as an alias in later versions.
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# In older versions, and in some other projects that use kconfig, the target is
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# not supported at all, and we use 'yes "" | make oldconfig' as a fallback
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# only, as this can fail in complex cases.
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# $(1): the name of the package in upper-case letters
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define kconfig-package-regen-dot-config
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$(if $(filter olddefconfig,$($(1)_KCONFIG_RULES)),
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$(Q)$($(1)_KCONFIG_MAKE) olddefconfig,
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$(if $(filter oldnoconfig,$($(1)_KCONFIG_RULES)),
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$(Q)$($(1)_KCONFIG_MAKE) oldnoconfig,
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$(Q)(yes "" | $($(1)_KCONFIG_MAKE) oldconfig)))
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endef
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# Macro to create a .config file where all given fragments are merged into.
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# $(1): the name of the package in upper-case letters
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# $(2): name of the .config file
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# $(3): fragment files to merge
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define kconfig-package-merge-config
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$(Q)$(if $($(1)_KCONFIG_DEFCONFIG),\
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$($(1)_KCONFIG_MAKE) $($(1)_KCONFIG_DEFCONFIG),\
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$(INSTALL) -m 0644 -D $($(1)_KCONFIG_FILE) $(2))
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$(Q)support/kconfig/merge_config.sh -m -O $(dir $(2)) $(2) $(3)
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$(call kconfig-package-regen-dot-config,$(1))
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endef
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################################################################################
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# inner-kconfig-package -- generates the make targets needed to support a
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# kconfig package
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#
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# argument 1 is the lowercase package name
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# argument 2 is the uppercase package name, including a HOST_ prefix
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# for host packages
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# argument 3 is the uppercase package name, without the HOST_ prefix
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# for host packages
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# argument 4 is the type (target or host)
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################################################################################
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define inner-kconfig-package
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# Default values
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$(2)_MAKE ?= $$(MAKE)
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$(2)_KCONFIG_EDITORS ?= menuconfig
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$(2)_KCONFIG_DOTCONFIG ?= .config
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$(2)_KCONFIG_SUPPORTS_DEFCONFIG ?= YES
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# Register the kconfig dependencies as regular dependencies, so that
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# they are also accounted for in the generated graphs.
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$(2)_DEPENDENCIES += $$($(2)_KCONFIG_DEPENDENCIES)
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# Generate the kconfig-related help: one entry for each editor.
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# Additionally, if the package is *not* using an in-tree defconfig
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# name, an entry for updating the package configuration file.
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ifndef $(2)_HELP_CMDS
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define $(2)_HELP_CMDS
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$$(foreach editor, $$($(2)_KCONFIG_EDITORS), \
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@printf ' %-22s - Run %s %s\n' $(1)-$$(editor) $(1) $$(editor)
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)
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$$(if $$($(2)_KCONFIG_DEFCONFIG),,\
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$$(if $$(filter YES,$$($(2)_KCONFIG_SUPPORTS_DEFCONFIG)),\
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@printf ' %-22s - Save the %s configuration as a defconfig file\n' \
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$(1)-update-defconfig $(1)
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@printf ' %-22s to %s\n' '' $$($(2)_KCONFIG_FILE)
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@printf ' %-22s (or override with %s_KCONFIG_FILE)\n' '' $(2)
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)
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@printf ' %-22s - Save the %s configuration as a full .config file\n' \
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$(1)-update-config $(1)
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@printf ' %-22s to %s\n' '' $$($(2)_KCONFIG_FILE)
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@printf ' %-22s (or override with %s_KCONFIG_FILE)\n' '' $(2)
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)
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endef
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endif
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# Call the generic package infrastructure to generate the necessary
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# make targets.
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# Note: this must be done _before_ attempting to use $$($(2)_DIR) in a
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# dependency expression
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$(call inner-generic-package,$(1),$(2),$(3),$(4))
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# Do not use $(2)_KCONFIG_DOTCONFIG as stamp file, because the package
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# buildsystem (e.g. linux >= 4.19) may touch it, thus rendering our
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# timestamps out of date, thus re-trigerring the build of the package.
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# Instead, use a specific file of our own as timestamp.
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$(2)_KCONFIG_STAMP_DOTCONFIG = .stamp_dotconfig
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# The config file as well as the fragments could be in-tree, so before
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# depending on them the package should be extracted (and patched) first.
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#
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# Since those files only have a order-only dependency, make would treat
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# any missing one as a "force" target:
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# https://www.gnu.org/software/make/manual/make.html#Force-Targets
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# and would forcibly any rule that depend on those files, causing a
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# rebuild of the kernel each time make is called.
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#
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# So, we provide a recipe that checks all of those files exist, to
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# overcome that standard make behaviour.
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#
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$$($(2)_KCONFIG_FILE) $$($(2)_KCONFIG_FRAGMENT_FILES): | $(1)-patch
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for f in $$($(2)_KCONFIG_FILE) $$($(2)_KCONFIG_FRAGMENT_FILES); do \
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if [ ! -f "$$$${f}" ]; then \
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printf "Kconfig file or fragment '%s' for '%s' does not exist\n" "$$$${f}" "$(1)"; \
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exit 1; \
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fi; \
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done
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$(2)_KCONFIG_MAKE = \
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$$($(2)_MAKE_ENV) $$($(2)_MAKE) -C $$($(2)_DIR) \
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$$(PKG_KCONFIG_COMMON_OPTS) $$($(2)_KCONFIG_OPTS)
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# $(2)_KCONFIG_MAKE may already rely on shell expansion. As the $() syntax
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# of the shell conflicts with Make's own syntax, this means that backticks
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# are used with those shell constructs. Unfortunately, the backtick syntax
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# does not nest, and we need to use Make instead of the shell to handle
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# conditions.
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# A recursively expanded variable is necessary, to be sure that the shell
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# command is called when the rule is processed during the build and not
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# when the rule is created when parsing all packages.
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$(2)_KCONFIG_RULES = \
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$$(shell $$($(2)_KCONFIG_MAKE) -pn config 2>/dev/null | \
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sed 's/^\([_0-9a-zA-Z]*config\):.*/\1/ p; d')
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# The specified source configuration file and any additional configuration file
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# fragments are merged together to .config, after the package has been patched.
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# Since the file could be a defconfig file it needs to be expanded to a
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# full .config first.
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$$($(2)_DIR)/$$($(2)_KCONFIG_STAMP_DOTCONFIG): $$($(2)_KCONFIG_FILE) $$($(2)_KCONFIG_FRAGMENT_FILES)
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$$(call prepare-per-package-directory,$$($(2)_KCONFIG_DEPENDENCIES))
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$$(call kconfig-package-merge-config,$(2),$$(@D)/$$($(2)_KCONFIG_DOTCONFIG),\
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$$($(2)_KCONFIG_FRAGMENT_FILES))
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$$(Q)touch $$(@D)/$$($(2)_KCONFIG_STAMP_DOTCONFIG)
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# If _KCONFIG_FILE or _KCONFIG_FRAGMENT_FILES exists, this dependency is
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# already implied, but if we only have a _KCONFIG_DEFCONFIG we have to add
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# it explicitly. It doesn't hurt to always have it though.
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$$($(2)_DIR)/$$($(2)_KCONFIG_STAMP_DOTCONFIG): | $(1)-patch
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# Some packages may need additional tools to be present by the time their
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# kconfig structure is parsed (e.g. the linux kernel may need to call to
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# the compiler to test its features).
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$$($(2)_DIR)/$$($(2)_KCONFIG_STAMP_DOTCONFIG): | $$($(2)_KCONFIG_DEPENDENCIES)
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# In order to get a usable, consistent configuration, some fixup may be needed.
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# The exact rules are specified by the package .mk file.
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define $(2)_FIXUP_DOT_CONFIG
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$$($(2)_KCONFIG_FIXUP_CMDS)
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$$(call kconfig-package-regen-dot-config,$(2))
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$$(Q)touch $$($(2)_DIR)/.stamp_kconfig_fixup_done
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endef
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$$($(2)_DIR)/.stamp_kconfig_fixup_done: PKG=$(2)
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$$($(2)_DIR)/.stamp_kconfig_fixup_done: $$($(2)_DIR)/$$($(2)_KCONFIG_STAMP_DOTCONFIG)
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$$($(2)_FIXUP_DOT_CONFIG)
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# Before running configure, the configuration file should be present and fixed
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$$($(2)_TARGET_CONFIGURE): $$($(2)_DIR)/.stamp_kconfig_fixup_done
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# Force olddefconfig again on -reconfigure
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$(1)-clean-for-reconfigure: $(1)-clean-kconfig-for-reconfigure
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$(1)-clean-kconfig-for-reconfigure:
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rm -f $$($(2)_DIR)/$$($(2)_KCONFIG_STAMP_DOTCONFIG)
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# Only enable the foo-*config targets when the package is actually enabled.
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# Note: the variable $(2)_KCONFIG_VAR is not related to the kconfig
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# infrastructure, but defined by pkg-generic.mk. The generic infrastructure is
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# already called above, so we can effectively use this variable.
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ifeq ($$($$($(2)_KCONFIG_VAR)),y)
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ifeq ($$(BR_BUILDING),y)
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# Either FOO_KCONFIG_FILE or FOO_KCONFIG_DEFCONFIG is required...
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ifeq ($$(or $$($(2)_KCONFIG_FILE),$$($(2)_KCONFIG_DEFCONFIG)),)
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$$(error Internal error: no value specified for $(2)_KCONFIG_FILE or $(2)_KCONFIG_DEFCONFIG)
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endif
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# ... but not both:
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ifneq ($$(and $$($(2)_KCONFIG_FILE),$$($(2)_KCONFIG_DEFCONFIG)),)
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$$(error Internal error: $(2)_KCONFIG_FILE and $(2)_KCONFIG_DEFCONFIG are mutually exclusive but both are defined)
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endif
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endif
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# For the configurators, we do want to use the system-provided host
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# tools, not the ones we build. This is particularly true for
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# pkg-config; if we use our pkg-config (from host-pkgconf), then it
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# would not look for the .pc from the host, but we do need them,
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# especially to find ncurses, GTK+, Qt (resp. for menuconfig and
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# nconfig, gconfig, xconfig).
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# So we simply remove our PATH and PKG_CONFIG_* variables.
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$(2)_CONFIGURATOR_MAKE_ENV = \
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$$(filter-out PATH=% PKG_CONFIG=% PKG_CONFIG_SYSROOT_DIR=% \
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PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=% PKG_CONFIG_ALLOW_SYSTEM_LIBS=% \
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PKG_CONFIG_LIBDIR=%,$$($(2)_MAKE_ENV)) \
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PKG_CONFIG_PATH="$(HOST_PKG_CONFIG_PATH)"
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# Configuration editors (menuconfig, ...)
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#
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# We need to apply the configuration fixups right after a configuration
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# editor exits, so that it is possible to save the configuration right
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# after exiting an editor, and so the user always sees a .config file
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# that is clean wrt. our requirements.
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#
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# Because commands in $(1)_FIXUP_KCONFIG are probably using $(@D), we
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# need to have a valid @D set. But, because the configurators rules are
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# not real files and do not contain the path to the package build dir,
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# @D would be just '.' in this case. So, we use an intermediate rule
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# with a stamp-like file which path is in the package build dir, so we
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# end up having a valid @D.
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#
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$$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS)): $(1)-%: $$($(2)_DIR)/.kconfig_editor_%
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$$($(2)_DIR)/.kconfig_editor_%: PKG=$(2)
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$$($(2)_DIR)/.kconfig_editor_%: $$($(2)_DIR)/.stamp_kconfig_fixup_done
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$$($(2)_CONFIGURATOR_MAKE_ENV) $$($(2)_MAKE) -C $$($(2)_DIR) \
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$$(PKG_KCONFIG_COMMON_OPTS) $$($(2)_KCONFIG_OPTS) $$(*)
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rm -f $$($(2)_DIR)/.stamp_{kconfig_fixup_done,configured,built}
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rm -f $$($(2)_DIR)/.stamp_{target,staging,images}_installed
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$$($(2)_FIXUP_DOT_CONFIG)
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# Saving back the configuration
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#
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# Ideally, that should directly depend on $$($(2)_DIR)/.stamp_kconfig_fixup_done,
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# but that breaks the use-case in PR-8156 (from a clean tree):
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# make menuconfig <- enable kernel, use an in-tree defconfig, save and exit
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# make linux-menuconfig <- enable/disable whatever option, save and exit
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# make menuconfig <- change to use a custom defconfig file, set a path, save and exit
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# make linux-update-config <- should save to the new custom defconfig file
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#
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# Because of that use-case, saving the configuration can *not* directly
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# depend on the stamp file, because it itself depends on the .config,
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# which in turn depends on the (newly-set an non-existent) custom
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# defconfig file.
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#
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# Instead, we use a PHONY rule that will catch that situation.
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#
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$(1)-check-configuration-done:
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@if [ ! -f $$($(2)_DIR)/.stamp_kconfig_fixup_done ]; then \
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echo "$(1) is not yet configured"; \
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exit 1; \
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fi
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ifeq ($$($(2)_KCONFIG_SUPPORTS_DEFCONFIG),YES)
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.PHONY: $(1)-savedefconfig
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$(1)-savedefconfig: $(1)-check-configuration-done
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$$(call kconfig-package-savedefconfig,$(2))
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endif
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ifeq ($$($(2)_KCONFIG_DEFCONFIG),)
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# Target to copy back the configuration to the source configuration file
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# Even though we could use 'cp --preserve-timestamps' here, the separate
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# cp and 'touch --reference' is used for symmetry with $(1)-update-defconfig.
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.PHONY: $(1)-update-config
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$(1)-update-config: PKG=$(2)
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$(1)-update-config: $(1)-check-configuration-done
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$$(call kconfig-package-update-config,$$($(2)_KCONFIG_DOTCONFIG))
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ifeq ($$($(2)_KCONFIG_SUPPORTS_DEFCONFIG),YES)
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# Note: make sure the timestamp of the stored configuration is not newer than
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# the .config to avoid a useless rebuild. Note that, contrary to
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# $(1)-update-config, the reference for 'touch' is _not_ the file from which
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# we copy.
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.PHONY: $(1)-update-defconfig
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$(1)-update-defconfig: PKG=$(2)
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$(1)-update-defconfig: $(1)-savedefconfig
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$$(call kconfig-package-update-config,defconfig)
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endif
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endif
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# Target to output differences between the configuration obtained via the
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# defconfig + fragments (if any) and the current configuration.
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# Note: it preserves the timestamp of the current configuration when moving it
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# around.
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$(1)-diff-config: $(1)-check-configuration-done
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$$(Q)cp -a $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG) $$($(2)_DIR)/.config.dc.bak
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$$(call kconfig-package-merge-config,$(2),$$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG),\
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$$($(2)_KCONFIG_FRAGMENT_FILES))
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$$(Q)utils/diffconfig $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG) \
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$$($(2)_DIR)/.config.dc.bak
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$$(Q)cp -a $$($(2)_DIR)/.config.dc.bak $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG)
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$$(Q)rm -f $$($(2)_DIR)/.config.dc.bak
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endif # package enabled
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.PHONY: \
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$(1)-diff-config \
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$(1)-check-configuration-done \
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$$($(2)_DIR)/.kconfig_editor_% \
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$$(addprefix $(1)-,$$($(2)_KCONFIG_EDITORS))
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endef # inner-kconfig-package
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################################################################################
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# kconfig-package -- the target generator macro for kconfig packages
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################################################################################
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kconfig-package = $(call inner-kconfig-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
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