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The inner-xxx-targets in the buildroot package infrastructures are
evaluated using $(eval) which causes variable references to be a bit
different than in regular make code. As we want most references to be
expanded only at the time of the $(eval) we should not use standard
references $(VAR) but rather use double dollar signs $$(VAR). This includes
function references like $(call), $(subst), etc. The only exception is the
reference to pkgdir/pkgname and numbered variables, which are parameters to
the inner block: $(1), $(2), etc.
This patch introduces consistent usage of double-dollar signs throughout the
different inner-xxx-targets blocks.
In some cases, this would potentially cause circular references, in
particular when the value of HOST_FOO_VAR would be obtained from the
corresponding FOO_VAR if HOST_FOO_VAR is not defined. In these cases, a test
is added to check for a host package (the only case where such constructions
are relevant; these are not circular).
Benefits of these changes are:
- behavior of variables is now again as expected. For example, setting
$(2)_VERSION = virtual in pkg-virtual.mk will effectively work, while
originally it would cause very odd results.
- The output of 'make printvars' is now much more useful. This target shows
the value of all variables, and the expression that led to that value.
However, if the expression was coming from an inner-xxx-targets block, and
was using single dollar signs, it would show in printvars as
VAR = value (value)
while if double dollar signs are used, it would effectively look like
VAR = value (actual expression)
as is intended.
This improvement is for example effective for FOO_DL_VERSION, FOO_RAWNAME,
FOO_SITE_METHOD and FOO_MAKE.
The correctness of this patch has been verified using 'make printvars',
'make manual' and 'make legal-info' before and after applying this patch,
and comparing the output.
Insight-provided-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
182 lines
6.5 KiB
Makefile
182 lines
6.5 KiB
Makefile
################################################################################
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# CMake 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 CMake packages. It should be used for all
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# packages that use CMake as their build system.
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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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# In terms of implementation, this CMake infrastructure requires
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# the .mk file to only specify metadata informations about the
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# package: name, version, download URL, etc.
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#
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# We still allow the package .mk file to override what the different
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# steps are doing, if needed. For example, if <PKG>_BUILD_CMDS is
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# already defined, it is used as the list of commands to perform to
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# build the package, instead of the default CMake behaviour. The
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# package can also define some post operation hooks.
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#
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################################################################################
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################################################################################
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# inner-cmake-package -- defines how the configuration, compilation and
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# installation of a CMake package should be done, implements a few hooks to
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# tune the build process and calls the generic package infrastructure to
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# 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 an 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-cmake-package
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$(2)_CONF_ENV ?=
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$(2)_CONF_OPT ?=
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$(2)_MAKE ?= $$(MAKE)
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$(2)_MAKE_ENV ?=
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$(2)_MAKE_OPT ?=
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$(2)_INSTALL_HOST_OPT ?= install
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$(2)_INSTALL_STAGING_OPT ?= DESTDIR=$$(STAGING_DIR) install
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$(2)_INSTALL_TARGET_OPT ?= DESTDIR=$$(TARGET_DIR) install
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$(2)_SRCDIR = $$($(2)_DIR)/$$($(2)_SUBDIR)
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$(2)_BUILDDIR = $$($(2)_SRCDIR)
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#
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# Configure step. Only define it if not already defined by the package
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# .mk file. And take care of the differences between host and target
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# packages.
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#
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ifndef $(2)_CONFIGURE_CMDS
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ifeq ($(4),target)
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# Configure package for target
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define $(2)_CONFIGURE_CMDS
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(cd $$($$(PKG)_BUILDDIR) && \
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rm -f CMakeCache.txt && \
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PATH=$$(BR_PATH) \
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$$($$(PKG)_CONF_ENV) $$(HOST_DIR)/usr/bin/cmake $$($$(PKG)_SRCDIR) \
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-DCMAKE_TOOLCHAIN_FILE="$$(HOST_DIR)/usr/share/buildroot/toolchainfile.cmake" \
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-DCMAKE_BUILD_TYPE=$$(if $$(BR2_ENABLE_DEBUG),Debug,Release) \
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-DCMAKE_INSTALL_PREFIX="/usr" \
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-DCMAKE_COLOR_MAKEFILE=OFF \
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-DBUILD_TESTING=OFF \
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-DBUILD_SHARED_LIBS=$$(if $$(BR2_PREFER_STATIC_LIB),OFF,ON) \
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-DUSE_CCACHE=$$(if $$(BR2_CCACHE),ON,OFF) \
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$$($$(PKG)_CONF_OPT) \
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)
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endef
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else
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# Configure package for host
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define $(2)_CONFIGURE_CMDS
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(cd $$($$(PKG)_BUILDDIR) && \
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rm -f CMakeCache.txt && \
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PATH=$$(BR_PATH) \
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$$(HOST_DIR)/usr/bin/cmake $$($$(PKG)_SRCDIR) \
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-DCMAKE_INSTALL_SO_NO_EXE=0 \
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-DCMAKE_FIND_ROOT_PATH="$$(HOST_DIR)" \
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-DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM="BOTH" \
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-DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY="BOTH" \
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-DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE="BOTH" \
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-DCMAKE_INSTALL_PREFIX="$$(HOST_DIR)/usr" \
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-DUSE_CCACHE=$$(if $$(BR2_CCACHE),ON,OFF) \
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-DBUILD_TESTING=OFF \
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$$($$(PKG)_CONF_OPT) \
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)
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endef
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endif
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endif
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# This must be repeated from inner-generic-package, otherwise we only get
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# host-cmake in _DEPENDENCIES because of the following line
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ifeq ($(4),host)
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$(2)_DEPENDENCIES ?= $$(filter-out host-toolchain $(1),$$(patsubst host-host-%,host-%,$$(addprefix host-,$$($(3)_DEPENDENCIES))))
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endif
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$(2)_DEPENDENCIES += host-cmake
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#
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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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#
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ifndef $(2)_BUILD_CMDS
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ifeq ($(4),target)
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define $(2)_BUILD_CMDS
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$$(TARGET_MAKE_ENV) $$($$(PKG)_MAKE_ENV) $$($$(PKG)_MAKE) $$($$(PKG)_MAKE_OPT) -C $$($$(PKG)_BUILDDIR)
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endef
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else
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define $(2)_BUILD_CMDS
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$$(HOST_MAKE_ENV) $$($$(PKG)_MAKE_ENV) $$($$(PKG)_MAKE) $$($$(PKG)_MAKE_OPT) -C $$($$(PKG)_BUILDDIR)
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endef
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endif
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endif
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#
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# Host installation step. Only define it if not already defined by the
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# package .mk file.
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#
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ifndef $(2)_INSTALL_CMDS
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define $(2)_INSTALL_CMDS
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$$(HOST_MAKE_ENV) $$($$(PKG)_MAKE_ENV) $$($$(PKG)_MAKE) $$($$(PKG)_MAKE_OPT) $$($$(PKG)_INSTALL_HOST_OPT) -C $$($$(PKG)_BUILDDIR)
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endef
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endif
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#
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# Staging installation step. Only define it if not already defined by
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# the package .mk file.
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#
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ifndef $(2)_INSTALL_STAGING_CMDS
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define $(2)_INSTALL_STAGING_CMDS
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$$(TARGET_MAKE_ENV) $$($$(PKG)_MAKE_ENV) $$($$(PKG)_MAKE) $$($$(PKG)_MAKE_OPT) $$($$(PKG)_INSTALL_STAGING_OPT) -C $$($$(PKG)_BUILDDIR)
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endef
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endif
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#
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# Target installation step. Only define it if not already defined by
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# the package .mk file.
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#
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ifndef $(2)_INSTALL_TARGET_CMDS
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define $(2)_INSTALL_TARGET_CMDS
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$$(TARGET_MAKE_ENV) $$($$(PKG)_MAKE_ENV) $$($$(PKG)_MAKE) $$($$(PKG)_MAKE_OPT) $$($$(PKG)_INSTALL_TARGET_OPT) -C $$($$(PKG)_BUILDDIR)
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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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$(call inner-generic-package,$(1),$(2),$(3),$(4))
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endef
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################################################################################
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# cmake-package -- the target generator macro for CMake packages
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################################################################################
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cmake-package = $(call inner-cmake-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
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host-cmake-package = $(call inner-cmake-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)
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################################################################################
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# Generation of the CMake toolchain file
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################################################################################
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# In order to allow the toolchain to be relocated, we calculate the HOST_DIR
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# based on the toolchainfile.cmake file's location: $(HOST_DIR)/usr/share/buildroot
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# In all the other variables, HOST_DIR will be replaced by RELOCATED_HOST_DIR,
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# so we have to strip "$(HOST_DIR)/" from the paths that contain it.
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$(HOST_DIR)/usr/share/buildroot/toolchainfile.cmake:
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@mkdir -p $(@D)
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sed \
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-e 's:@@STAGING_SUBDIR@@:$(call qstrip,$(STAGING_SUBDIR)):' \
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-e 's:@@TARGET_CFLAGS@@:$(call qstrip,$(TARGET_CFLAGS)):' \
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-e 's:@@TARGET_CXXFLAGS@@:$(call qstrip,$(TARGET_CXXFLAGS)):' \
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-e 's:@@TARGET_CC_NOCCACHE@@:$(subst $(HOST_DIR)/,,$(call qstrip,$(TARGET_CC_NOCCACHE))):' \
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-e 's:@@TARGET_CXX_NOCCACHE@@:$(subst $(HOST_DIR)/,,$(call qstrip,$(TARGET_CXX_NOCCACHE))):' \
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$(TOPDIR)/support/misc/toolchainfile.cmake.in \
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> $@
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