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kbuild: Add support for an "archheaders" target

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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>
This commit is contained in:
H. Peter Anvin 2011-11-17 13:17:35 -08:00
parent cb97914b04
commit 052ad27496
3 changed files with 39 additions and 21 deletions
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50
Documentation/kbuild/makefiles.txt
View file

@ -33,14 +33,15 @@ This document describes the Linux kernel Makefiles.
=== 6 Architecture Makefiles === 6 Architecture Makefiles
--- 6.1 Set variables to tweak the build to the architecture --- 6.1 Set variables to tweak the build to the architecture
--- 6.2 Add prerequisites to archprepare: --- 6.2 Add prerequisites to archheaders:
--- 6.3 List directories to visit when descending --- 6.3 Add prerequisites to archprepare:
--- 6.4 Architecture-specific boot images --- 6.4 List directories to visit when descending
--- 6.5 Building non-kbuild targets --- 6.5 Architecture-specific boot images
--- 6.6 Commands useful for building a boot image --- 6.6 Building non-kbuild targets
--- 6.7 Custom kbuild commands --- 6.7 Commands useful for building a boot image
--- 6.8 Preprocessing linker scripts --- 6.8 Custom kbuild commands
--- 6.9 Generic header files --- 6.9 Preprocessing linker scripts
--- 6.10 Generic header files
=== 7 Kbuild syntax for exported headers === 7 Kbuild syntax for exported headers
--- 7.1 header-y --- 7.1 header-y
@ -252,7 +253,7 @@ more details, with real examples.
This will create a library lib.a based on delay.o. For kbuild to This will create a library lib.a based on delay.o. For kbuild to
actually recognize that there is a lib.a being built, the directory actually recognize that there is a lib.a being built, the directory
shall be listed in libs-y. shall be listed in libs-y.
See also "6.3 List directories to visit when descending". See also "6.4 List directories to visit when descending".
Use of lib-y is normally restricted to lib/ and arch/*/lib. Use of lib-y is normally restricted to lib/ and arch/*/lib.
@ -974,7 +975,20 @@ When kbuild executes, the following steps are followed (roughly):
$(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic $(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
mode) if this option is supported by $(AR). mode) if this option is supported by $(AR).
--- 6.2 Add prerequisites to archprepare: --- 6.2 Add prerequisites to archheaders:
The archheaders: rule is used to generate header files that
may be installed into user space by "make header_install" or
"make headers_install_all". In order to support
"make headers_install_all", this target has to be able to run
on an unconfigured tree, or a tree configured for another
architecture.
It is run before "make archprepare" when run on the
architecture itself.
--- 6.3 Add prerequisites to archprepare:
The archprepare: rule is used to list prerequisites that need to be The archprepare: rule is used to list prerequisites that need to be
built before starting to descend down in the subdirectories. built before starting to descend down in the subdirectories.
@ -990,7 +1004,7 @@ When kbuild executes, the following steps are followed (roughly):
generating offset header files. generating offset header files.
--- 6.3 List directories to visit when descending --- 6.4 List directories to visit when descending
An arch Makefile cooperates with the top Makefile to define variables An arch Makefile cooperates with the top Makefile to define variables
which specify how to build the vmlinux file. Note that there is no which specify how to build the vmlinux file. Note that there is no
@ -1019,7 +1033,7 @@ When kbuild executes, the following steps are followed (roughly):
drivers-$(CONFIG_OPROFILE) += arch/sparc64/oprofile/ drivers-$(CONFIG_OPROFILE) += arch/sparc64/oprofile/
--- 6.4 Architecture-specific boot images --- 6.5 Architecture-specific boot images
An arch Makefile specifies goals that take the vmlinux file, compress An arch Makefile specifies goals that take the vmlinux file, compress
it, wrap it in bootstrapping code, and copy the resulting files it, wrap it in bootstrapping code, and copy the resulting files
@ -1070,7 +1084,7 @@ When kbuild executes, the following steps are followed (roughly):
When "make" is executed without arguments, bzImage will be built. When "make" is executed without arguments, bzImage will be built.
--- 6.5 Building non-kbuild targets --- 6.6 Building non-kbuild targets
extra-y extra-y
@ -1090,7 +1104,7 @@ When kbuild executes, the following steps are followed (roughly):
shall be built, but shall not be linked as part of built-in.o. shall be built, but shall not be linked as part of built-in.o.
--- 6.6 Commands useful for building a boot image --- 6.7 Commands useful for building a boot image
Kbuild provides a few macros that are useful when building a Kbuild provides a few macros that are useful when building a
boot image. boot image.
@ -1112,7 +1126,7 @@ When kbuild executes, the following steps are followed (roughly):
always be built. always be built.
Assignments to $(targets) are without $(obj)/ prefix. Assignments to $(targets) are without $(obj)/ prefix.
if_changed may be used in conjunction with custom commands as if_changed may be used in conjunction with custom commands as
defined in 6.7 "Custom kbuild commands". defined in 6.8 "Custom kbuild commands".
Note: It is a typical mistake to forget the FORCE prerequisite. Note: It is a typical mistake to forget the FORCE prerequisite.
Another common pitfall is that whitespace is sometimes Another common pitfall is that whitespace is sometimes
@ -1171,7 +1185,7 @@ When kbuild executes, the following steps are followed (roughly):
$(obj)/%.dtb: $(src)/%.dts $(obj)/%.dtb: $(src)/%.dts
$(call cmd,dtc) $(call cmd,dtc)
--- 6.7 Custom kbuild commands --- 6.8 Custom kbuild commands
When kbuild is executing with KBUILD_VERBOSE=0, then only a shorthand When kbuild is executing with KBUILD_VERBOSE=0, then only a shorthand
of a command is normally displayed. of a command is normally displayed.
@ -1198,7 +1212,7 @@ When kbuild executes, the following steps are followed (roughly):
will be displayed with "make KBUILD_VERBOSE=0". will be displayed with "make KBUILD_VERBOSE=0".
--- 6.8 Preprocessing linker scripts --- 6.9 Preprocessing linker scripts
When the vmlinux image is built, the linker script When the vmlinux image is built, the linker script
arch/$(ARCH)/kernel/vmlinux.lds is used. arch/$(ARCH)/kernel/vmlinux.lds is used.
@ -1228,7 +1242,7 @@ When kbuild executes, the following steps are followed (roughly):
The kbuild infrastructure for *lds file are used in several The kbuild infrastructure for *lds file are used in several
architecture-specific files. architecture-specific files.
--- 6.9 Generic header files --- 6.10 Generic header files
The directory include/asm-generic contains the header files The directory include/asm-generic contains the header files
that may be shared between individual architectures. that may be shared between individual architectures.

9
Makefile
View file

@ -442,7 +442,7 @@ asm-generic:
no-dot-config-targets := clean mrproper distclean \ no-dot-config-targets := clean mrproper distclean \
cscope gtags TAGS tags help %docs check% coccicheck \ cscope gtags TAGS tags help %docs check% coccicheck \
include/linux/version.h headers_% \ include/linux/version.h headers_% archheaders \
kernelversion %src-pkg kernelversion %src-pkg
config-targets := 0 config-targets := 0
@ -979,7 +979,7 @@ prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
include/config/auto.conf include/config/auto.conf
$(cmd_crmodverdir) $(cmd_crmodverdir)
archprepare: prepare1 scripts_basic archprepare: archheaders prepare1 scripts_basic
prepare0: archprepare FORCE prepare0: archprepare FORCE
$(Q)$(MAKE) $(build)=. $(Q)$(MAKE) $(build)=.
@ -1046,8 +1046,11 @@ hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
# If we do an all arch process set dst to asm-$(hdr-arch) # If we do an all arch process set dst to asm-$(hdr-arch)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
PHONY += archheaders
archheaders:
PHONY += __headers PHONY += __headers
__headers: include/linux/version.h scripts_basic asm-generic FORCE __headers: include/linux/version.h scripts_basic asm-generic archheaders FORCE
$(Q)$(MAKE) $(build)=scripts build_unifdef $(Q)$(MAKE) $(build)=scripts build_unifdef
PHONY += headers_install_all PHONY += headers_install_all

1
scripts/headers.sh
View file

@ -7,6 +7,7 @@ set -e
do_command() do_command()
{ {
if [ -f ${srctree}/arch/$2/include/asm/Kbuild ]; then if [ -f ${srctree}/arch/$2/include/asm/Kbuild ]; then
make ARCH=$2 KBUILD_HEADERS=$1 archheaders
make ARCH=$2 KBUILD_HEADERS=$1 headers_$1 make ARCH=$2 KBUILD_HEADERS=$1 headers_$1
else else
printf "Ignoring arch: %s\n" ${arch} printf "Ignoring arch: %s\n" ${arch}