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freebsd-dev/sys/conf/kern.post.mk
Mike Smith 0b3178a45c Eliminate the use of commons in the kernel and modules, 
simplifying the module linking process and eliminating the risks
associated with doubly-defined variables.

Cases where commons were legitimately used (detection of
compiled-in subsystems) have been converted to use sysinits, and
any new code should use this or an equivalent practice as a
matter of course.

Modules can override this behaviour by substituting -fno-common
out of ${CFLAGS} in cases where commons are necessary
(eg. third-party object modules).  Commons will be resolved and
allocated space when the kld is linked as part of the module
build process, so they will not pose a risk to the kernel or
other modules.

Provide a mechanism for controlling the export of symbols from
the module namespace.  The EXPORT_SYMS variable may be set in the
Makefile to NO (export no symbols), a list of symbols to export,
or the name of a file containing a newline-seperated list of
symbols to be exported.  Non-exported symbols are converted to
local symbols.  If EXPORT_SYMS is not set, all global symbols are
currently exported.  This behaviour is expected to change (to
exporting no symbols) once modules have been converted.

Reviewed by:	peter (in principle)
Obtained from:	green (kmod_syms.awk)
2002-01-10 03:52:01 +00:00

232 lines
6.3 KiB
Makefile
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# kern.post.mk
#
# Unified Makefile for building kenrels. This includes all the definitions
# that need to be included after all the % directives, except %RULES and
# things that act like they are part of %RULES
#
# Most make variables should not be defined in this file. Instead, they
# should be defined in the kern.pre.mk so that port makefiles can
# override or augment them.
#
# $FreeBSD$
#
.PHONY: all modules
depend: kernel-depend
clean: kernel-clean
cleandepend: kernel-cleandepend
clobber: kernel-clobber
tags: kernel-tags
install: kernel-install
install.debug: kernel-install.debug
reinstall: kernel-reinstall
reinstall.debug: kernel-reinstall.debug
.if !defined(DEBUG)
FULLKERNEL= ${KERNEL_KO}
.else
FULLKERNEL= ${KERNEL_KO}.debug
${KERNEL_KO}: ${FULLKERNEL}
${OBJCOPY} --strip-debug ${FULLKERNEL} ${KERNEL_KO}
.endif
${FULLKERNEL}: ${SYSTEM_DEP} vers.o
@rm -f ${.TARGET}
@echo linking ${.TARGET}
${SYSTEM_LD}
${SYSTEM_LD_TAIL}
.if !exists(.depend)
${SYSTEM_OBJS}: vnode_if.h ${BEFORE_DEPEND:M*.h} ${MFILES:T:S/.m$/.h/}
.endif
.for mfile in ${MFILES}
${mfile:T:S/.m$/.h/}: ${mfile}
perl5 $S/kern/makeobjops.pl -h ${mfile}
.endfor
kernel-clean:
rm -f *.o *.so *.So *.ko *.s eddep errs \
${FULLKERNEL} ${KERNEL_KO} linterrs makelinks \
setdef[01].c setdefs.h tags \
vers.c vnode_if.c vnode_if.h \
${MFILES:T:S/.m$/.c/} ${MFILES:T:S/.m$/.h/} \
${CLEAN}
kernel-clobber:
find . -type f ! -name version -delete
locore.o: $S/$M/$M/locore.s assym.s
${NORMAL_S}
# This is a hack. BFD "optimizes" away dynamic mode if there are no
# dynamic references. We could probably do a '-Bforcedynamic' mode like
# in the a.out ld. For now, this works.
HACK_EXTRA_FLAGS?= -shared
hack.So: Makefile
touch hack.c
${CC} ${FMT} ${HACK_EXTRA_FLAGS} -nostdlib hack.c -o hack.So
rm -f hack.c
# this rule stops ./assym.s in .depend from causing problems
./assym.s: assym.s
assym.s: $S/kern/genassym.sh genassym.o
NM=${NM} OBJFORMAT=elf sh $S/kern/genassym.sh genassym.o > ${.TARGET}
genassym.o: $S/$M/$M/genassym.c
${CC} -c ${CFLAGS:N-fno-common} $S/$M/$M/genassym.c
${SYSTEM_OBJS} genassym.o vers.o: opt_global.h
kernel-depend:
.if defined(EXTRA_KERNELDEP)
${EXTRA_KERNELDEP}
.endif
rm -f .olddep
if [ -f .depend ]; then mv .depend .olddep; fi
${MAKE} _kernel-depend
_kernel-depend: assym.s vnode_if.h ${BEFORE_DEPEND} \
${CFILES} ${SYSTEM_CFILES} ${GEN_CFILES} ${SFILES} \
${SYSTEM_SFILES} ${MFILES:T:S/.m$/.h/}
if [ -f .olddep ]; then mv .olddep .depend; fi
rm -f .newdep
env MKDEP_CPP="${CC} -E" CC="${CC}" \
mkdep -a -f .newdep ${CFLAGS} ${CFILES} ${SYSTEM_CFILES} ${GEN_CFILES}
env MKDEP_CPP="${CC} -E" \
mkdep -a -f .newdep ${ASM_CFLAGS} ${SFILES} ${SYSTEM_SFILES}
rm -f .depend
mv .newdep .depend
kernel-cleandepend:
rm -f .depend
links:
egrep '#if' ${CFILES} | sed -f $S/conf/defines | \
sed -e 's/:.*//' -e 's/\.c/.o/' | sort -u > dontlink
echo ${CFILES} | tr -s ' ' '\12' | sed 's/\.c/.o/' | \
sort -u | comm -23 - dontlink | \
sed 's,../.*/\(.*.o\),rm -f \1;ln -s ../GENERIC/\1 \1,' > makelinks
sh makelinks; rm -f dontlink
kernel-tags:
@[ -f .depend ] || { echo "you must make depend first"; exit 1; }
sh $S/conf/systags.sh
rm -f tags1
sed -e 's, ../, ,' tags > tags1
kernel-install kernel-install.debug:
.if exists(${DESTDIR}/boot)
@if [ ! -f ${DESTDIR}/boot/device.hints ] ; then \
echo "You must set up a ${DESTDIR}/boot/device.hints file first." ; \
exit 1 ; \
fi
@if [ x"`grep device.hints ${DESTDIR}/boot/defaults/loader.conf ${DESTDIR}/boot/loader.conf`" = "x" ]; then \
echo "You must activate /boot/device.hints in loader.conf." ; \
exit 1 ; \
fi
.endif
@if [ ! -f ${KERNEL_KO}${.TARGET:S/kernel-install//} ] ; then \
echo "You must build a kernel first." ; \
exit 1 ; \
fi
.if exists(${DESTDIR}${KODIR})
-thiskernel=`sysctl -n kern.bootfile` ; \
if [ "$$thiskernel" = ${DESTDIR}${KODIR}.old/${KERNEL_KO} ] ; then \
chflags -R noschg ${DESTDIR}${KODIR} ; \
rm -rf ${DESTDIR}${KODIR} ; \
else \
if [ -d ${DESTDIR}${KODIR}.old ] ; then \
chflags -R noschg ${DESTDIR}${KODIR}.old ; \
rm -rf ${DESTDIR}${KODIR}.old ; \
fi ; \
mv ${DESTDIR}${KODIR} ${DESTDIR}${KODIR}.old ; \
if [ "$$thiskernel" = ${DESTDIR}${KODIR}/${KERNEL_KO} ] ; then \
sysctl -w kern.bootfile=${DESTDIR}${KODIR}.old/${KERNEL_KO} ; \
fi; \
fi
.endif
mkdir -p ${DESTDIR}${KODIR}
install -c -m 555 -o root -g wheel \
${KERNEL_KO}${.TARGET:S/kernel-install//} ${DESTDIR}${KODIR}
kernel-reinstall kernel-reinstall.debug:
@-chflags -R noschg ${DESTDIR}${KODIR}
install -c -m 555 -o root -g wheel \
${KERNEL_KO}${.TARGET:S/kernel-reinstall//} ${DESTDIR}${KODIR}
.if !defined(MODULES_WITH_WORLD) && !defined(NO_MODULES) && exists($S/modules)
all: modules
depend: modules-depend
clean: modules-clean
cleandepend: modules-cleandepend
cleandir: modules-cleandir
clobber: modules-clobber
tags: modules-tags
install: modules-install
install.debug: modules-install.debug
reinstall: modules-reinstall
reinstall.debug: modules-reinstall.debug
.endif
modules:
@mkdir -p ${.OBJDIR}/modules
cd $S/modules ; env ${MKMODULESENV} ${MAKE} obj ; \
env ${MKMODULESENV} ${MAKE} all
modules-depend:
@mkdir -p ${.OBJDIR}/modules
cd $S/modules ; env ${MKMODULESENV} ${MAKE} obj ; \
env ${MKMODULESENV} ${MAKE} depend
modules-clean:
cd $S/modules ; env ${MKMODULESENV} ${MAKE} clean
modules-cleandepend:
cd $S/modules ; env ${MKMODULESENV} ${MAKE} cleandepend
modules-clobber: modules-clean
rm -rf ${MKMODULESENV}
modules-cleandir:
cd $S/modules ; env ${MKMODULESENV} ${MAKE} cleandir
modules-tags:
cd $S/modules ; env ${MKMODULESENV} ${MAKE} tags
modules-install modules-reinstall:
cd $S/modules ; env ${MKMODULESENV} ${MAKE} install
modules-install.debug modules-reinstall.debug:
cd $S/modules ; env ${MKMODULESENV} ${MAKE} install.debug
config.o:
${NORMAL_C}
vers.c: $S/conf/newvers.sh $S/sys/param.h ${SYSTEM_DEP}
sh $S/conf/newvers.sh ${KERN_IDENT} ${IDENT}
# XXX strictly, everything depends on Makefile because changes to ${PROF}
# only appear there, but we don't handle that.
vers.o:
${NORMAL_C}
hints.o: hints.c
${NORMAL_C}
env.o: env.c
${NORMAL_C}
vnode_if.c: $S/kern/vnode_if.pl $S/kern/vnode_if.src
perl5 $S/kern/vnode_if.pl -c $S/kern/vnode_if.src
vnode_if.h: $S/kern/vnode_if.pl $S/kern/vnode_if.src
perl5 $S/kern/vnode_if.pl -h $S/kern/vnode_if.src
vnode_if.o:
${NORMAL_C}
.include <bsd.kern.mk>
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