4f1933620f
The kbuild system takes advantage of an incorrect behavior in GNU make. Once this behavior is fixed, all files in the kernel rebuild every time, even if nothing has changed. This patch ensures kbuild works with both the incorrect and correct behaviors of GNU make. For more details on the incorrect behavior, see: http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html Changes in this patch: - Keep all targets that are to be marked .PHONY in a variable, PHONY. - Add .PHONY: $(PHONY) to mark them properly. - Remove any $(PHONY) files from the $? list when determining whether targets are up-to-date or not. Signed-off-by: Paul Smith <psmith@gnu.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
220 lines
6.4 KiB
Makefile
220 lines
6.4 KiB
Makefile
###
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# This makefile is used to generate the kernel documentation,
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# primarily based on in-line comments in various source files.
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# See Documentation/kernel-doc-nano-HOWTO.txt for instruction in how
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# to ducument the SRC - and how to read it.
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# To add a new book the only step required is to add the book to the
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# list of DOCBOOKS.
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DOCBOOKS := wanbook.xml z8530book.xml mcabook.xml videobook.xml \
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kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
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procfs-guide.xml writing_usb_driver.xml \
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sis900.xml kernel-api.xml journal-api.xml lsm.xml usb.xml \
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gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml
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###
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# The build process is as follows (targets):
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# (xmldocs)
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# file.tmpl --> file.xml +--> file.ps (psdocs)
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# +--> file.pdf (pdfdocs)
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# +--> DIR=file (htmldocs)
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# +--> man/ (mandocs)
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# for PDF and PS output you can choose between xmlto and docbook-utils tools
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PDF_METHOD = $(prefer-db2x)
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PS_METHOD = $(prefer-db2x)
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###
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# The targets that may be used.
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PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs
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BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
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xmldocs: $(BOOKS)
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sgmldocs: xmldocs
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PS := $(patsubst %.xml, %.ps, $(BOOKS))
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psdocs: $(PS)
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PDF := $(patsubst %.xml, %.pdf, $(BOOKS))
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pdfdocs: $(PDF)
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HTML := $(patsubst %.xml, %.html, $(BOOKS))
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htmldocs: $(HTML)
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MAN := $(patsubst %.xml, %.9, $(BOOKS))
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mandocs: $(MAN)
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installmandocs: mandocs
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mkdir -p /usr/local/man/man9/
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install Documentation/DocBook/man/*.9.gz /usr/local/man/man9/
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###
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#External programs used
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KERNELDOC = scripts/kernel-doc
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DOCPROC = scripts/basic/docproc
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XMLTOFLAGS = -m $(srctree)/Documentation/DocBook/stylesheet.xsl
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#XMLTOFLAGS += --skip-validation
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###
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# DOCPROC is used for two purposes:
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# 1) To generate a dependency list for a .tmpl file
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# 2) To preprocess a .tmpl file and call kernel-doc with
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# appropriate parameters.
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# The following rules are used to generate the .xml documentation
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# required to generate the final targets. (ps, pdf, html).
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quiet_cmd_docproc = DOCPROC $@
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cmd_docproc = SRCTREE=$(srctree)/ $(DOCPROC) doc $< >$@
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define rule_docproc
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set -e; \
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$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))';) \
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$(cmd_$(1)); \
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( \
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echo 'cmd_$@ := $(cmd_$(1))'; \
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echo $@: `SRCTREE=$(srctree) $(DOCPROC) depend $<`; \
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) > $(dir $@).$(notdir $@).cmd
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endef
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%.xml: %.tmpl FORCE
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$(call if_changed_rule,docproc)
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###
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#Read in all saved dependency files
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cmd_files := $(wildcard $(foreach f,$(BOOKS),$(dir $(f)).$(notdir $(f)).cmd))
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ifneq ($(cmd_files),)
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include $(cmd_files)
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endif
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###
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# Changes in kernel-doc force a rebuild of all documentation
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$(BOOKS): $(KERNELDOC)
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###
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# procfs guide uses a .c file as example code.
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# This requires an explicit dependency
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C-procfs-example = procfs_example.xml
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C-procfs-example2 = $(addprefix $(obj)/,$(C-procfs-example))
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$(obj)/procfs-guide.xml: $(C-procfs-example2)
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notfoundtemplate = echo "*** You have to install docbook-utils or xmlto ***"; \
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exit 1
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db2xtemplate = db2TYPE -o $(dir $@) $<
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xmltotemplate = xmlto TYPE $(XMLTOFLAGS) -o $(dir $@) $<
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# determine which methods are available
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ifeq ($(shell which db2ps >/dev/null 2>&1 && echo found),found)
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use-db2x = db2x
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prefer-db2x = db2x
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else
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use-db2x = notfound
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prefer-db2x = $(use-xmlto)
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endif
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ifeq ($(shell which xmlto >/dev/null 2>&1 && echo found),found)
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use-xmlto = xmlto
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prefer-xmlto = xmlto
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else
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use-xmlto = notfound
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prefer-xmlto = $(use-db2x)
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endif
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# the commands, generated from the chosen template
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quiet_cmd_db2ps = PS $@
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cmd_db2ps = $(subst TYPE,ps, $($(PS_METHOD)template))
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%.ps : %.xml
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$(call cmd,db2ps)
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quiet_cmd_db2pdf = PDF $@
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cmd_db2pdf = $(subst TYPE,pdf, $($(PDF_METHOD)template))
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%.pdf : %.xml
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$(call cmd,db2pdf)
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quiet_cmd_db2html = HTML $@
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cmd_db2html = xmlto xhtml $(XMLTOFLAGS) -o $(patsubst %.html,%,$@) $< && \
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echo '<a HREF="$(patsubst %.html,%,$(notdir $@))/index.html"> \
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Goto $(patsubst %.html,%,$(notdir $@))</a><p>' > $@
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%.html: %.xml
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@(which xmlto > /dev/null 2>&1) || \
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(echo "*** You need to install xmlto ***"; \
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exit 1)
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@rm -rf $@ $(patsubst %.html,%,$@)
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$(call cmd,db2html)
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@if [ ! -z "$(PNG-$(basename $(notdir $@)))" ]; then \
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cp $(PNG-$(basename $(notdir $@))) $(patsubst %.html,%,$@); fi
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quiet_cmd_db2man = MAN $@
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cmd_db2man = if grep -q refentry $<; then xmlto man $(XMLTOFLAGS) -o $(obj)/man $< ; gzip -f $(obj)/man/*.9; fi
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%.9 : %.xml
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@(which xmlto > /dev/null 2>&1) || \
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(echo "*** You need to install xmlto ***"; \
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exit 1)
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$(call cmd,db2man)
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@touch $@
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###
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# Rules to generate postscripts and PNG imgages from .fig format files
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quiet_cmd_fig2eps = FIG2EPS $@
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cmd_fig2eps = fig2dev -Leps $< $@
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%.eps: %.fig
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@(which fig2dev > /dev/null 2>&1) || \
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(echo "*** You need to install transfig ***"; \
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exit 1)
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$(call cmd,fig2eps)
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quiet_cmd_fig2png = FIG2PNG $@
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cmd_fig2png = fig2dev -Lpng $< $@
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%.png: %.fig
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@(which fig2dev > /dev/null 2>&1) || \
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(echo "*** You need to install transfig ***"; \
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exit 1)
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$(call cmd,fig2png)
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###
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# Rule to convert a .c file to inline XML documentation
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%.xml: %.c
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@echo ' GEN $@'
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@( \
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echo "<programlisting>"; \
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expand --tabs=8 < $< | \
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sed -e "s/&/\\&/g" \
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-e "s/</\\</g" \
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-e "s/>/\\>/g"; \
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echo "</programlisting>") > $@
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###
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# Help targets as used by the top-level makefile
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dochelp:
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@echo ' Linux kernel internal documentation in different formats:'
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@echo ' xmldocs (XML DocBook), psdocs (Postscript), pdfdocs (PDF)'
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@echo ' htmldocs (HTML), mandocs (man pages, use installmandocs to install)'
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###
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# Temporary files left by various tools
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clean-files := $(DOCBOOKS) \
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$(patsubst %.xml, %.dvi, $(DOCBOOKS)) \
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$(patsubst %.xml, %.aux, $(DOCBOOKS)) \
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$(patsubst %.xml, %.tex, $(DOCBOOKS)) \
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$(patsubst %.xml, %.log, $(DOCBOOKS)) \
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$(patsubst %.xml, %.out, $(DOCBOOKS)) \
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$(patsubst %.xml, %.ps, $(DOCBOOKS)) \
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$(patsubst %.xml, %.pdf, $(DOCBOOKS)) \
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$(patsubst %.xml, %.html, $(DOCBOOKS)) \
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$(patsubst %.xml, %.9, $(DOCBOOKS)) \
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$(C-procfs-example)
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clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS))
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#man put files in man subdir - traverse down
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subdir- := man/
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# Declare the contents of the .PHONY variable as phony. We keep that
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# information in a variable se we can use it in if_changed and friends.
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.PHONY: $(PHONY)
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