26a42e7c88
Assert that compilation takes place in a freestanding environment. This implies `-fno-builtin'. A freestanding environment is one in which the standard library may not exist, and program startup may not necessarily be at main. The most obvious example is an OS kernel. This is equivalent to `-fno-hosted'.
86 lines
2.4 KiB
Makefile
86 lines
2.4 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}
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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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-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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all: ${KERNEL_KO}
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