Commit 8d730cfb authored by David Woodhouse's avatar David Woodhouse

Basic implementation of 'make headers_install'

This adds a make target which exports a subset of headers which contain
definitions which are useful for system libraries and tools. It uses the
BSD 'unifdef' tool to remove instances of #ifdef __KERNEL__, and uses
sed to remove markers like __user.

Based on an original implementation by Arnd Bergmann <arnd@arndb.de>
Hacked about by David Woodhouse <dwmw2@infradead.org>
Reviewed and cleaned up by Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent 9348f0de
......@@ -855,6 +855,17 @@ PHONY += depend dep
depend dep:
@echo '*** Warning: make $@ is unnecessary now.'
# ---------------------------------------------------------------------------
# Kernel headers
INSTALL_HDR_PATH=$(MODLIB)/abi
export INSTALL_HDR_PATH
PHONY += headers_install
headers_install: include/linux/version.h
$(Q)unifdef -Ux /dev/null
$(Q)rm -rf $(INSTALL_HDR_PATH)/include
$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.headersinst obj=include
# ---------------------------------------------------------------------------
# Modules
......@@ -1027,6 +1038,8 @@ help:
@echo ' cscope - Generate cscope index'
@echo ' kernelrelease - Output the release version string'
@echo ' kernelversion - Output the version stored in Makefile'
@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'
@echo ' (default: /lib/modules/$$VERSION/abi)'
@echo ''
@echo 'Static analysers'
@echo ' checkstack - Generate a list of stack hogs'
......
# ==========================================================================
# Installing headers
#
# header-y files will be installed verbatim
# unifdef-y are the files where unifdef will be run before installing files
# objhdr-y are generated files that will be installed verbatim
#
# ==========================================================================
UNIFDEF := unifdef -U__KERNEL__
# Eliminate the contents of (and inclusions of) compiler.h
HDRSED := sed -e "s/ inline / __inline__ /g" \
-e "s/[[:space:]]__user[[:space:]]\+/ /g" \
-e "s/(__user[[:space:]]\+/ (/g" \
-e "s/[[:space:]]__force[[:space:]]\+/ /g" \
-e "s/(__force[[:space:]]\+/ (/g" \
-e "s/[[:space:]]__iomem[[:space:]]\+/ /g" \
-e "s/(__iomem[[:space:]]\+/ (/g" \
-e "s/[[:space:]]__attribute_const__[[:space:]]\+/\ /g" \
-e "s/[[:space:]]__attribute_const__$$//" \
-e "/^\#include <linux\/compiler.h>/d"
_dst := $(if $(dst),$(dst),$(obj))
.PHONY: __headersinst
__headersinst:
ifeq (,$(patsubst include/asm/%,,$(obj)/))
# For producing the generated stuff in include/asm for biarch builds, include
# both sets of Kbuild files; we'll generate anything which is mentioned in
# _either_ arch, and recurse into subdirectories which are mentioned in either
# arch. Since some directories may exist in one but not the other, we must
# use '-include'.
GENASM := 1
archasm := $(subst include/asm,asm-$(ARCH),$(obj))
altarchasm := $(subst include/asm,asm-$(ALTARCH),$(obj))
-include $(srctree)/include/$(archasm)/Kbuild
-include $(srctree)/include/$(altarchasm)/Kbuild
else
include $(srctree)/$(obj)/Kbuild
endif
include scripts/Kbuild.include
# If this is include/asm-$(ARCH) and there's no $(ALTARCH), then
# override $(_dst) so that we install to include/asm directly.
ifeq ($(obj)$(ALTARCH),include/asm-$(ARCH))
_dst := include/asm
endif
header-y := $(sort $(header-y))
unifdef-y := $(sort $(unifdef-y))
subdir-y := $(patsubst %/,%,$(filter %/, $(header-y)))
header-y := $(filter-out %/, $(header-y))
header-y := $(filter-out $(unifdef-y),$(header-y))
ifdef ALTARCH
ifeq ($(obj),include/asm-$(ARCH))
altarch-y := altarch-dir
endif
endif
# Make the definitions visible for recursive make invocations
export ALTARCH
export ARCHDEF
export ALTARCHDEF
quiet_cmd_o_hdr_install = INSTALL $(_dst)/$@
cmd_o_hdr_install = cp $(objtree)/$(obj)/$@ $(INSTALL_HDR_PATH)/$(_dst)
quiet_cmd_headers_install = INSTALL $(_dst)/$@
cmd_headers_install = $(HDRSED) $(srctree)/$(obj)/$@ \
> $(INSTALL_HDR_PATH)/$(_dst)/$@
quiet_cmd_unifdef = UNIFDEF $(_dst)/$@
cmd_unifdef = $(UNIFDEF) $(srctree)/$(obj)/$@ | $(HDRSED) \
> $(INSTALL_HDR_PATH)/$(_dst)/$@ || :
quiet_cmd_mkdir = MKDIR $@
cmd_mkdir = mkdir -p $(INSTALL_HDR_PATH)/$@
quiet_cmd_gen = GEN $(_dst)/$@
cmd_gen = \
STUBDEF=__ASM_STUB_`echo $@ | tr a-z. A-Z_`; \
(echo "/* File autogenerated by 'make headers_install' */" ; \
echo "\#ifndef $$STUBDEF" ; \
echo "\#define $$STUBDEF" ; \
echo "\# if $(ARCHDEF)" ; \
if [ -r $(srctree)/include/$(archasm)/$@ ]; then \
echo "\# include <$(archasm)/$@>" ; \
else \
echo "\# error $(archasm)/$@ does not exist in" \
"the $(ARCH) architecture" ; \
fi ; \
echo "\# elif $(ALTARCHDEF)" ; \
if [ -r $(srctree)/include/$(altarchasm)/$@ ]; then \
echo "\# include <$(altarchasm)/$@>" ; \
else \
echo "\# error $(altarchasm)/$@ does not exist in" \
"the $(ALTARCH) architecture" ; \
fi ; \
echo "\# else" ; \
echo "\# warning This machine appears to be" \
"neither $(ARCH) nor $(ALTARCH)." ; \
echo "\# endif" ; \
echo "\#endif /* $$STUBDEF */" ; \
) > $(INSTALL_HDR_PATH)/$(_dst)/$@
__headersinst: $(subdir-y) $(header-y) $(unifdef-y) $(altarch-y) $(objhdr-y)
.PHONY: $(header-y) $(unifdef-y) $(subdir-y)
# Rules for installing headers
$(objhdr-y) $(subdir-y) $(header-y) $(unifdef-y): $(_dst)
.PHONY: $(_dst)
$(_dst):
$(call cmd,mkdir)
ifdef GENASM
$(objhdr-y) $(header-y) $(unifdef-y):
$(call cmd,gen)
else
$(objhdr-y):
$(call cmd,o_hdr_install)
$(header-y):
$(call cmd,headers_install)
$(unifdef-y):
$(call cmd,unifdef)
endif
hdrinst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
.PHONY: altarch-dir
altarch-dir:
$(Q)$(MAKE) $(hdrinst)=include/asm-$(ALTARCH) dst=include/asm-$(ALTARCH)
$(Q)$(MAKE) $(hdrinst)=include/asm dst=include/asm
# Recursion
$(subdir-y):
$(Q)$(MAKE) $(hdrinst)=$(obj)/$@ dst=$(_dst)/$@ rel=../$(rel)
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