60817d0403
Since linux-4.19, the kernel's build system internally touches its
.config file.
However, we currently used that file as a timestamp to detect whether
our kconfig fixups were to be (re)applied or not, which in turn is used
to decide whether we should (re)build the package or not.
But with latest kernel versions, this timestamp heuristic is now broken,
and we always rebuild the kernel on subsequent builds.
We fix that by introducing a separate timestamp file of our own, which
we know the kernel (or the kconfig-based packages, for that matters)
does not use.
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 05fea6e4a6)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
274 lines
12 KiB
Makefile
274 lines
12 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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# $(1): file to copy from
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define kconfig-package-update-config
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@$(if $($(PKG)_KCONFIG_FRAGMENT_FILES), \
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echo "Unable to perform $(@) when fragment files are set"; exit 1)
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@$(if $($(PKG)_KCONFIG_DEFCONFIG), \
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echo "Unable to perform $(@) when using a defconfig rule"; exit 1)
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$(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=$(HOSTCC_NOCCACHE)
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################################################################################
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# inner-kconfig-package -- generates the make targets needed to support a
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# kconfig package
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#
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# argument 1 is the lowercase package name
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# argument 2 is the uppercase package name, including a HOST_ prefix
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# for host packages
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# argument 3 is the uppercase package name, without the HOST_ prefix
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# for host packages
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# argument 4 is the type (target or host)
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################################################################################
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define inner-kconfig-package
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# Register the kconfig dependencies as regular dependencies, so that
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# they are also accounted for in the generated graphs.
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$(2)_DEPENDENCIES += $$($(2)_KCONFIG_DEPENDENCIES)
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# Call the generic package infrastructure to generate the necessary
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# make targets.
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# Note: this must be done _before_ attempting to use $$($(2)_DIR) in a
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# dependency expression
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$(call inner-generic-package,$(1),$(2),$(3),$(4))
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# Default values
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$(2)_KCONFIG_EDITORS ?= menuconfig
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$(2)_KCONFIG_OPTS ?=
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$(2)_KCONFIG_FIXUP_CMDS ?=
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$(2)_KCONFIG_FRAGMENT_FILES ?=
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$(2)_KCONFIG_DOTCONFIG ?= .config
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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 "$$$${f}" ]; then \
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printf "Kconfig fragment '%s' for '%s' does not exist\n" "$$$${f}" "$(1)"; \
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exit 1; \
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fi; \
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done
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$(2)_KCONFIG_MAKE = \
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$$($(2)_MAKE_ENV) $$(MAKE) -C $$($(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 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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define $(2)_REGEN_DOT_CONFIG
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$$(if $$(filter olddefconfig,$$($(2)_KCONFIG_RULES)),
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$$(Q)$$($(2)_KCONFIG_MAKE) olddefconfig,
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$$(if $$(filter oldnoconfig,$$($(2)_KCONFIG_RULES)),
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$$(Q)$$($(2)_KCONFIG_MAKE) oldnoconfig,
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$$(Q)(yes "" | $$($(2)_KCONFIG_MAKE) oldconfig)))
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endef
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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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$$(Q)$$(if $$($(2)_KCONFIG_DEFCONFIG), \
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$$($(2)_KCONFIG_MAKE) $$($(2)_KCONFIG_DEFCONFIG), \
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$$(INSTALL) -m 0644 -D $$($(2)_KCONFIG_FILE) $$(@D)/$$($(2)_KCONFIG_DOTCONFIG))
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$$(Q)support/kconfig/merge_config.sh -m -O $$(@D) \
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$$(@D)/$$($(2)_KCONFIG_DOTCONFIG) $$($(2)_KCONFIG_FRAGMENT_FILES)
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$$($(2)_REGEN_DOT_CONFIG)
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$$(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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$$($(2)_REGEN_DOT_CONFIG)
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$$(Q)touch $$($(2)_DIR)/.stamp_kconfig_fixup_done
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endef
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$$($(2)_DIR)/.stamp_kconfig_fixup_done: $$($(2)_DIR)/$$($(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)/.stamp_kconfig_fixup_done
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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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$$($(2)_DIR)/.kconfig_editor_%: $$($(2)_DIR)/.stamp_kconfig_fixup_done
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$$($(2)_CONFIGURATOR_MAKE_ENV) $$(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 $$($(2)_DIR)/.stamp_kconfig_fixup_done ]; then \
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echo "$(1) is not yet configured"; \
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exit 1; \
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fi
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$(1)-savedefconfig: $(1)-check-configuration-done
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$$($(2)_MAKE_ENV) $$(MAKE) -C $$($(2)_DIR) \
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$$(PKG_KCONFIG_COMMON_OPTS) $$($(2)_KCONFIG_OPTS) savedefconfig
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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 $(1)-update-defconfig.
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$(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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# 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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# $(1)-update-config, the reference for 'touch' is _not_ the file from which
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# we copy.
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$(1)-update-defconfig: PKG=$(2)
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$(1)-update-defconfig: $(1)-savedefconfig
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$$(call kconfig-package-update-config,defconfig)
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endif # package enabled
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.PHONY: \
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$(1)-update-config \
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$(1)-update-defconfig \
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$(1)-savedefconfig \
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$(1)-check-configuration-done \
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$$($(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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