kbuild: Add support for an "archheaders" target
Add support for an "archheaders" target. This target can generate files that need to be installed for user space by "make headers_install" or "make headers_install_all". In order to support "make headers_install_all", it must be able to run without the tree having to be configured first. Cc: David Woodhouse <dwmw2@infradead.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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H. Peter Anvin
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3 changed files with 39 additions and 21 deletions
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@ -33,14 +33,15 @@ This document describes the Linux kernel Makefiles.
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=== 6 Architecture Makefiles
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--- 6.1 Set variables to tweak the build to the architecture
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--- 6.2 Add prerequisites to archprepare:
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--- 6.3 List directories to visit when descending
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--- 6.4 Architecture-specific boot images
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--- 6.5 Building non-kbuild targets
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--- 6.6 Commands useful for building a boot image
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--- 6.7 Custom kbuild commands
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--- 6.8 Preprocessing linker scripts
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--- 6.9 Generic header files
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--- 6.2 Add prerequisites to archheaders:
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--- 6.3 Add prerequisites to archprepare:
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--- 6.4 List directories to visit when descending
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--- 6.5 Architecture-specific boot images
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--- 6.6 Building non-kbuild targets
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--- 6.7 Commands useful for building a boot image
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--- 6.8 Custom kbuild commands
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--- 6.9 Preprocessing linker scripts
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--- 6.10 Generic header files
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=== 7 Kbuild syntax for exported headers
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--- 7.1 header-y
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@ -252,7 +253,7 @@ more details, with real examples.
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This will create a library lib.a based on delay.o. For kbuild to
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actually recognize that there is a lib.a being built, the directory
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shall be listed in libs-y.
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See also "6.3 List directories to visit when descending".
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See also "6.4 List directories to visit when descending".
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Use of lib-y is normally restricted to lib/ and arch/*/lib.
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@ -974,7 +975,20 @@ When kbuild executes, the following steps are followed (roughly):
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$(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
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mode) if this option is supported by $(AR).
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--- 6.2 Add prerequisites to archprepare:
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--- 6.2 Add prerequisites to archheaders:
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The archheaders: rule is used to generate header files that
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may be installed into user space by "make header_install" or
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"make headers_install_all". In order to support
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"make headers_install_all", this target has to be able to run
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on an unconfigured tree, or a tree configured for another
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architecture.
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It is run before "make archprepare" when run on the
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architecture itself.
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--- 6.3 Add prerequisites to archprepare:
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The archprepare: rule is used to list prerequisites that need to be
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built before starting to descend down in the subdirectories.
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@ -990,7 +1004,7 @@ When kbuild executes, the following steps are followed (roughly):
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generating offset header files.
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--- 6.3 List directories to visit when descending
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--- 6.4 List directories to visit when descending
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An arch Makefile cooperates with the top Makefile to define variables
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which specify how to build the vmlinux file. Note that there is no
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@ -1019,7 +1033,7 @@ When kbuild executes, the following steps are followed (roughly):
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drivers-$(CONFIG_OPROFILE) += arch/sparc64/oprofile/
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--- 6.4 Architecture-specific boot images
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--- 6.5 Architecture-specific boot images
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An arch Makefile specifies goals that take the vmlinux file, compress
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it, wrap it in bootstrapping code, and copy the resulting files
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@ -1070,7 +1084,7 @@ When kbuild executes, the following steps are followed (roughly):
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When "make" is executed without arguments, bzImage will be built.
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--- 6.5 Building non-kbuild targets
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--- 6.6 Building non-kbuild targets
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extra-y
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@ -1090,7 +1104,7 @@ When kbuild executes, the following steps are followed (roughly):
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shall be built, but shall not be linked as part of built-in.o.
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--- 6.6 Commands useful for building a boot image
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--- 6.7 Commands useful for building a boot image
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Kbuild provides a few macros that are useful when building a
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boot image.
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@ -1112,7 +1126,7 @@ When kbuild executes, the following steps are followed (roughly):
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always be built.
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Assignments to $(targets) are without $(obj)/ prefix.
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if_changed may be used in conjunction with custom commands as
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defined in 6.7 "Custom kbuild commands".
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defined in 6.8 "Custom kbuild commands".
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Note: It is a typical mistake to forget the FORCE prerequisite.
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Another common pitfall is that whitespace is sometimes
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@ -1171,7 +1185,7 @@ When kbuild executes, the following steps are followed (roughly):
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$(obj)/%.dtb: $(src)/%.dts
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$(call cmd,dtc)
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--- 6.7 Custom kbuild commands
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--- 6.8 Custom kbuild commands
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When kbuild is executing with KBUILD_VERBOSE=0, then only a shorthand
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of a command is normally displayed.
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@ -1198,7 +1212,7 @@ When kbuild executes, the following steps are followed (roughly):
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will be displayed with "make KBUILD_VERBOSE=0".
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--- 6.8 Preprocessing linker scripts
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--- 6.9 Preprocessing linker scripts
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When the vmlinux image is built, the linker script
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arch/$(ARCH)/kernel/vmlinux.lds is used.
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@ -1228,7 +1242,7 @@ When kbuild executes, the following steps are followed (roughly):
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The kbuild infrastructure for *lds file are used in several
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architecture-specific files.
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--- 6.9 Generic header files
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--- 6.10 Generic header files
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The directory include/asm-generic contains the header files
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that may be shared between individual architectures.
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9
Makefile
9
Makefile
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@ -442,7 +442,7 @@ asm-generic:
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no-dot-config-targets := clean mrproper distclean \
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cscope gtags TAGS tags help %docs check% coccicheck \
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include/linux/version.h headers_% \
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include/linux/version.h headers_% archheaders \
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kernelversion %src-pkg
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config-targets := 0
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@ -979,7 +979,7 @@ prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
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include/config/auto.conf
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$(cmd_crmodverdir)
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archprepare: prepare1 scripts_basic
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archprepare: archheaders prepare1 scripts_basic
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prepare0: archprepare FORCE
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$(Q)$(MAKE) $(build)=.
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@ -1046,8 +1046,11 @@ hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
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# If we do an all arch process set dst to asm-$(hdr-arch)
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hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
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PHONY += archheaders
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archheaders:
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PHONY += __headers
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__headers: include/linux/version.h scripts_basic asm-generic FORCE
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__headers: include/linux/version.h scripts_basic asm-generic archheaders FORCE
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$(Q)$(MAKE) $(build)=scripts build_unifdef
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PHONY += headers_install_all
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@ -7,6 +7,7 @@ set -e
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do_command()
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{
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if [ -f ${srctree}/arch/$2/include/asm/Kbuild ]; then
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make ARCH=$2 KBUILD_HEADERS=$1 archheaders
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make ARCH=$2 KBUILD_HEADERS=$1 headers_$1
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else
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printf "Ignoring arch: %s\n" ${arch}
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