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0b3178a45c
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)
97 lines
2.7 KiB
Makefile
97 lines
2.7 KiB
Makefile
# kern.pre.mk
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#
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# Unified Makefile for building kenrels. This includes all the definitions
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# that need to be included before %BEFORE_DEPEND
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#
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# $FreeBSD$
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#
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# Can be overridden by makeoptions or /etc/make.conf
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KERNEL_KO?= kernel
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KERNEL?= kernel
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KODIR?= /boot/${KERNEL}
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M= ${MACHINE_ARCH}
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NM?= nm
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OBJCOPY?= objcopy
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SIZE?= size
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COPTFLAGS?=-O -pipe
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.if !defined(NO_CPU_COPTFLAGS)
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COPTFLAGS+= ${_CPUCFLAGS}
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.endif
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INCLUDES= -nostdinc -I- ${INCLMAGIC} -I. -I$S -I$S/dev
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# This hack lets us use the Intel ACPICA code without spamming a new
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# include path into 100+ source files.
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INCLUDES+= -I$S/contrib/dev/acpica
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# ... and the same for ipfilter
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INCLUDES+= -I$S/contrib/ipfilter
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# This hack is to allow kernel compiles to succeed on machines w/out srcdist
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.if exists($S/../include)
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INCLUDES+= -I$S/../include
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.else
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INCLUDES+= -I/usr/include
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.endif
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COPTS= ${INCLUDES} ${IDENT} -D_KERNEL -ffreestanding -include opt_global.h
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CFLAGS= ${COPTFLAGS} ${CWARNFLAGS} ${DEBUG} ${COPTS} -fno-common
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# XXX LOCORE means "don't declare C stuff" not "for locore.s".
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ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${CFLAGS}
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# Select the correct set of tools. Can't set OBJFORMAT here because it
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# doesn't get exported into the environment, and if it were exported
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# then it might break building of utilities.
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FMT?= -elf
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CFLAGS+= ${FMT}
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DEFINED_PROF= ${PROF}
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.if defined(PROF)
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CFLAGS+= -malign-functions=4
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.if ${PROFLEVEL} >= 2
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IDENT+= -DGPROF4 -DGUPROF
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PROF+= -mprofiler-epilogue
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.endif
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.endif
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# Put configuration-specific C flags last (except for ${PROF}) so that they
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# can override the others.
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CFLAGS+= ${CONF_CFLAGS}
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NORMAL_C= ${CC} -c ${CFLAGS} ${PROF} ${.IMPSRC}
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NORMAL_C_C= ${CC} -c ${CFLAGS} ${PROF} ${.IMPSRC}
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NORMAL_S= ${CC} -c ${ASM_CFLAGS} ${.IMPSRC}
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PROFILE_C= ${CC} -c ${CFLAGS} ${.IMPSRC}
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NORMAL_M= perl5 $S/kern/makeobjops.pl -c $<; \
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${CC} -c ${CFLAGS} ${PROF} ${.PREFIX}.c
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GEN_CFILES= $S/$M/$M/genassym.c
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SYSTEM_CFILES= vnode_if.c hints.c env.c config.c
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SYSTEM_SFILES= $S/$M/$M/locore.s
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SYSTEM_DEP= Makefile ${SYSTEM_OBJS}
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SYSTEM_OBJS= locore.o vnode_if.o ${OBJS} hints.o env.o config.o hack.So
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SYSTEM_LD= @${LD} ${FMT} -Bdynamic -T $S/conf/ldscript.$M \
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-warn-common -export-dynamic -dynamic-linker /red/herring \
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-o ${.TARGET} -X ${SYSTEM_OBJS} vers.o
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SYSTEM_LD_TAIL= @${OBJCOPY} --strip-symbol gcc2_compiled. ${.TARGET} ; \
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${SIZE} ${FMT} ${.TARGET} ; chmod 755 ${.TARGET}
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SYSTEM_DEP+= $S/conf/ldscript.$M
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# MKMODULESENV is set here so that port makefiles can augment
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# them.
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MKMODULESENV= MAKEOBJDIRPREFIX=${.OBJDIR}/modules KMODDIR=${KODIR}
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.if defined(MODULES_OVERRIDE)
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MKMODULESENV+= MODULES_OVERRIDE="${MODULES_OVERRIDE}"
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.endif
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.if defined(DEBUG)
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MKMODULESENV+= DEBUG="${DEBUG}" DEBUG_FLAGS="${DEBUG}"
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.endif
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all: ${KERNEL_KO}
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