The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/conf/kern.pre.mk

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    1 # $FreeBSD$
    2 
    3 # Part of a unified Makefile for building kernels.  This part contains all
    4 # of the definitions that need to be before %BEFORE_DEPEND.
    5 
    6 # Allow user to configure things that only effect src tree builds.
    7 # Note: This is duplicated from src.sys.mk to ensure that we include
    8 # /etc/src.conf when building the kernel. Kernels can be built without
    9 # the rest of /usr/src, but they still always process SRCCONF even though
   10 # the normal mechanisms to prevent that (compiling out of tree) won't
   11 # work. To ensure they do work, we have to duplicate thee few lines here.
   12 SRCCONF?=       /etc/src.conf
   13 .if (exists(${SRCCONF}) || ${SRCCONF} != "/etc/src.conf") && !target(_srcconf_included_)
   14 .include "${SRCCONF}"
   15 _srcconf_included_:
   16 .endif
   17 
   18 .include <bsd.own.mk>
   19 .include <bsd.compiler.mk>
   20 .include "kern.opts.mk"
   21 
   22 # The kernel build always occurs in the object directory which is .CURDIR.
   23 .if ${.MAKE.MODE:Unormal:Mmeta}
   24 .MAKE.MODE+=    curdirOk=yes
   25 .endif
   26 
   27 # The kernel build always expects .OBJDIR=.CURDIR.
   28 .OBJDIR: ${.CURDIR}
   29 
   30 .if defined(NO_OBJWALK) || ${MK_AUTO_OBJ} == "yes"
   31 NO_OBJWALK=             t
   32 NO_MODULES_OBJ= t
   33 .endif
   34 .if !defined(NO_OBJWALK)
   35 _obj=           obj
   36 .endif
   37 
   38 # Can be overridden by makeoptions or /etc/make.conf
   39 KERNEL_KO?=     kernel
   40 KERNEL?=        kernel
   41 KODIR?=         /boot/${KERNEL}
   42 LDSCRIPT_NAME?= ldscript.$M
   43 LDSCRIPT?=      $S/conf/${LDSCRIPT_NAME}
   44 
   45 M=              ${MACHINE}
   46 
   47 AWK?=           awk
   48 CP?=            cp
   49 NM?=            nm
   50 OBJCOPY?=       objcopy
   51 SIZE?=          size
   52 
   53 .if defined(DEBUG)
   54 _MINUS_O=       -O
   55 CTFFLAGS+=      -g
   56 .else
   57 .if ${MACHINE_CPUARCH} == "powerpc"
   58 _MINUS_O=       -O      # gcc miscompiles some code at -O2
   59 .else
   60 _MINUS_O=       -O2
   61 .endif
   62 .endif
   63 .if ${MACHINE_CPUARCH} == "amd64"
   64 .if ${COMPILER_TYPE} == "clang"
   65 COPTFLAGS?=-O2 -pipe
   66 .else
   67 COPTFLAGS?=-O2 -frename-registers -pipe
   68 .endif
   69 .else
   70 COPTFLAGS?=${_MINUS_O} -pipe
   71 .endif
   72 .if !empty(COPTFLAGS:M-O[23s]) && empty(COPTFLAGS:M-fno-strict-aliasing)
   73 COPTFLAGS+= -fno-strict-aliasing
   74 .endif
   75 .if !defined(NO_CPU_COPTFLAGS)
   76 COPTFLAGS+= ${_CPUCFLAGS}
   77 .endif
   78 NOSTDINC= -nostdinc
   79 
   80 INCLUDES= ${NOSTDINC} ${INCLMAGIC} -I. -I$S -I$S/contrib/ck/include
   81 
   82 CFLAGS= ${COPTFLAGS} ${DEBUG}
   83 CFLAGS+= ${INCLUDES} -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h
   84 CFLAGS_PARAM_INLINE_UNIT_GROWTH?=100
   85 CFLAGS_PARAM_LARGE_FUNCTION_GROWTH?=1000
   86 .if ${MACHINE_CPUARCH} == "mips"
   87 CFLAGS_ARCH_PARAMS?=--param max-inline-insns-single=1000 -DMACHINE_ARCH='"${MACHINE_ARCH}"'
   88 .endif
   89 CFLAGS.gcc+= -fms-extensions -finline-limit=${INLINE_LIMIT}
   90 CFLAGS.gcc+= --param inline-unit-growth=${CFLAGS_PARAM_INLINE_UNIT_GROWTH}
   91 CFLAGS.gcc+= --param large-function-growth=${CFLAGS_PARAM_LARGE_FUNCTION_GROWTH}
   92 CFLAGS.gcc+= -fms-extensions
   93 .if defined(CFLAGS_ARCH_PARAMS)
   94 CFLAGS.gcc+=${CFLAGS_ARCH_PARAMS}
   95 .endif
   96 .if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} < 50000
   97 WERROR?=        -Wno-error
   98 .else
   99 WERROR?=        -Werror
  100 .endif
  101 # The following should be removed no earlier than LLVM11 being imported into the
  102 # tree, to ensure we don't regress the build.  LLVM11 and GCC10 will switch the
  103 # default over to -fno-common, making this redundant.
  104 CFLAGS+=        -fno-common
  105 
  106 # XXX LOCORE means "don't declare C stuff" not "for locore.s".
  107 ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${CFLAGS} ${ASM_CFLAGS.${.IMPSRC:T}} 
  108 
  109 .if defined(PROFLEVEL) && ${PROFLEVEL} >= 1
  110 CFLAGS+=        -DGPROF
  111 CFLAGS.gcc+=    -falign-functions=16
  112 .if ${PROFLEVEL} >= 2
  113 CFLAGS+=        -DGPROF4 -DGUPROF
  114 PROF=           -pg
  115 .if ${COMPILER_TYPE} == "gcc"
  116 PROF+=          -mprofiler-epilogue
  117 .endif
  118 .else
  119 PROF=           -pg
  120 .endif
  121 .endif
  122 DEFINED_PROF=   ${PROF}
  123 
  124 # Put configuration-specific C flags last (except for ${PROF}) so that they
  125 # can override the others.
  126 CFLAGS+=        ${CONF_CFLAGS}
  127 
  128 .if defined(LINKER_FEATURES) && ${LINKER_FEATURES:Mbuild-id}
  129 LDFLAGS+=       --build-id=sha1
  130 .endif
  131 
  132 .if (${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \
  133     ${MACHINE_CPUARCH} == "i386") && \
  134     defined(LINKER_FEATURES) && ${LINKER_FEATURES:Mifunc} == "" && \
  135     !make(install)
  136 .error amd64/arm64/i386 kernel requires linker ifunc support
  137 .endif
  138 .if ${MACHINE_CPUARCH} == "amd64"
  139 LDFLAGS+=       -z max-page-size=2097152
  140 .if ${LINKER_TYPE} != "lld"
  141 LDFLAGS+=       -z common-page-size=4096
  142 .else
  143 LDFLAGS+=       -z notext -z ifunc-noplt
  144 .endif
  145 .endif
  146 
  147 .if ${MACHINE_CPUARCH} == "riscv"
  148 # Hack: Work around undefined weak symbols being out of range when linking with
  149 # LLD (address is a PC-relative calculation, and BFD works around this by
  150 # rewriting the instructions to generate an absolute address of 0); -fPIE
  151 # avoids this since it uses the GOT for all extern symbols, which is overly
  152 # inefficient for us. Drop once undefined weak symbols work with medany.
  153 .if ${LINKER_TYPE} == "lld"
  154 CFLAGS+=        -fPIE
  155 .endif
  156 .endif
  157 
  158 NORMAL_C= ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}
  159 NORMAL_S= ${CC:N${CCACHE_BIN}} -c ${ASM_CFLAGS} ${WERROR} ${.IMPSRC}
  160 PROFILE_C= ${CC} -c ${CFLAGS} ${WERROR} ${.IMPSRC}
  161 NORMAL_C_NOWERROR= ${CC} -c ${CFLAGS} ${PROF} ${.IMPSRC}
  162 
  163 NORMAL_M= ${AWK} -f $S/tools/makeobjops.awk ${.IMPSRC} -c ; \
  164           ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.PREFIX}.c
  165 
  166 NORMAL_FW= uudecode -o ${.TARGET} ${.ALLSRC}
  167 NORMAL_FWO= ${LD} -b binary --no-warn-mismatch -d -warn-common -r \
  168         -m ${LD_EMULATION} -o ${.TARGET} ${.ALLSRC:M*.fw}
  169 
  170 # for ZSTD in the kernel (include zstd/lib/freebsd before other CFLAGS)
  171 ZSTD_C= ${CC} -c -DZSTD_HEAPMODE=1 -I$S/contrib/zstd/lib/freebsd ${CFLAGS} -I$S/contrib/zstd/lib -I$S/contrib/zstd/lib/common ${WERROR} -Wno-inline -Wno-missing-prototypes ${PROF} -U__BMI__ ${.IMPSRC}
  172 
  173 # Common for dtrace / zfs
  174 CDDL_CFLAGS=    -DFREEBSD_NAMECACHE -nostdinc -I$S/cddl/compat/opensolaris -I$S/cddl/contrib/opensolaris/uts/common -I$S -I$S/cddl/contrib/opensolaris/common ${CFLAGS} -Wno-unknown-pragmas -Wno-missing-prototypes -Wno-undef -Wno-strict-prototypes -Wno-cast-qual -Wno-parentheses -Wno-redundant-decls -Wno-missing-braces -Wno-uninitialized -Wno-unused -Wno-inline -Wno-switch -Wno-pointer-arith -Wno-unknown-pragmas
  175 CDDL_CFLAGS+=   -include $S/cddl/compat/opensolaris/sys/debug_compat.h
  176 CDDL_C=         ${CC} -c ${CDDL_CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}
  177 
  178 # Special flags for managing the compat compiles for ZFS
  179 ZFS_CFLAGS=     -DBUILDING_ZFS -I$S/cddl/contrib/opensolaris/uts/common/fs/zfs
  180 ZFS_CFLAGS+=    -I$S/cddl/contrib/opensolaris/uts/common/fs/zfs/lua
  181 ZFS_CFLAGS+=    -I$S/cddl/contrib/opensolaris/uts/common/zmod
  182 ZFS_CFLAGS+=    -I$S/cddl/contrib/opensolaris/common/lz4
  183 ZFS_CFLAGS+=    -I$S/cddl/contrib/opensolaris/common/zfs
  184 ZFS_CFLAGS+=    ${CDDL_CFLAGS}
  185 ZFS_ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${ZFS_CFLAGS}
  186 ZFS_C=          ${CC} -c ${ZFS_CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}
  187 ZFS_S=          ${CC} -c ${ZFS_ASM_CFLAGS} ${WERROR} ${.IMPSRC}
  188 
  189 # Special flags for managing the compat compiles for DTrace
  190 DTRACE_CFLAGS=  -DBUILDING_DTRACE ${CDDL_CFLAGS} -I$S/cddl/dev/dtrace -I$S/cddl/dev/dtrace/${MACHINE_CPUARCH}
  191 .if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
  192 DTRACE_CFLAGS+= -I$S/cddl/contrib/opensolaris/uts/intel -I$S/cddl/dev/dtrace/x86
  193 .endif
  194 DTRACE_CFLAGS+= -I$S/cddl/contrib/opensolaris/common/util -I$S -DDIS_MEM -DSMP
  195 DTRACE_ASM_CFLAGS=      -x assembler-with-cpp -DLOCORE ${DTRACE_CFLAGS}
  196 DTRACE_C=       ${CC} -c ${DTRACE_CFLAGS}       ${WERROR} ${PROF} ${.IMPSRC}
  197 DTRACE_S=       ${CC} -c ${DTRACE_ASM_CFLAGS}   ${WERROR} ${.IMPSRC}
  198 
  199 # Special flags for managing the compat compiles for DTrace/FBT
  200 FBT_CFLAGS=     -DBUILDING_DTRACE -nostdinc -I$S/cddl/dev/fbt/${MACHINE_CPUARCH} -I$S/cddl/dev/fbt -I$S/cddl/compat/opensolaris -I$S/cddl/contrib/opensolaris/uts/common -I$S ${CDDL_CFLAGS}
  201 .if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386"
  202 FBT_CFLAGS+=    -I$S/cddl/dev/fbt/x86
  203 .endif
  204 FBT_C=          ${CC} -c ${FBT_CFLAGS}          ${WERROR} ${PROF} ${.IMPSRC}
  205 
  206 .if ${MK_CTF} != "no"
  207 NORMAL_CTFCONVERT=      ${CTFCONVERT} ${CTFFLAGS} ${.TARGET}
  208 .elif ${MAKE_VERSION} >= 5201111300
  209 NORMAL_CTFCONVERT=
  210 .else
  211 NORMAL_CTFCONVERT=      @:
  212 .endif
  213 
  214 # Linux Kernel Programming Interface C-flags
  215 LINUXKPI_INCLUDES=      -I$S/compat/linuxkpi/common/include
  216 LINUXKPI_C=             ${NORMAL_C} ${LINUXKPI_INCLUDES}
  217 
  218 # Infiniband C flags.  Correct include paths and omit errors that linux
  219 # does not honor.
  220 OFEDINCLUDES=   -I$S/ofed/include -I$S/ofed/include/uapi ${LINUXKPI_INCLUDES}
  221 OFEDNOERR=      -Wno-cast-qual -Wno-pointer-arith
  222 OFEDCFLAGS=     ${CFLAGS:N-I*} -DCONFIG_INFINIBAND_USER_MEM \
  223                 ${OFEDINCLUDES} ${CFLAGS:M-I*} ${OFEDNOERR}
  224 OFED_C_NOIMP=   ${CC} -c -o ${.TARGET} ${OFEDCFLAGS} ${WERROR} ${PROF}
  225 OFED_C=         ${OFED_C_NOIMP} ${.IMPSRC}
  226 
  227 # mlxfw C flags.
  228 MLXFW_C=        ${OFED_C_NOIMP} \
  229                 -I${SRCTOP}/sys/contrib/xz-embedded/freebsd \
  230                 -I${SRCTOP}/sys/contrib/xz-embedded/linux/lib/xz \
  231                 ${.IMPSRC}
  232 
  233 GEN_CFILES= $S/$M/$M/genassym.c ${MFILES:T:S/.m$/.c/}
  234 SYSTEM_CFILES= config.c env.c hints.c vnode_if.c
  235 SYSTEM_DEP= Makefile ${SYSTEM_OBJS}
  236 SYSTEM_OBJS= locore.o ${MDOBJS} ${OBJS}
  237 SYSTEM_OBJS+= ${SYSTEM_CFILES:.c=.o}
  238 SYSTEM_OBJS+= hack.pico
  239 
  240 MD_ROOT_SIZE_CONFIGURED!=       grep MD_ROOT_SIZE opt_md.h || true ; echo
  241 .if ${MFS_IMAGE:Uno} != "no"
  242 .if empty(MD_ROOT_SIZE_CONFIGURED)
  243 SYSTEM_OBJS+= embedfs_${MFS_IMAGE:T:R}.o
  244 .endif
  245 .endif
  246 SYSTEM_LD= @${LD} -m ${LD_EMULATION} -Bdynamic -T ${LDSCRIPT} ${_LDFLAGS} \
  247         --no-warn-mismatch --warn-common --export-dynamic \
  248         --dynamic-linker /red/herring \
  249         -o ${.TARGET} -X ${SYSTEM_OBJS} vers.o
  250 SYSTEM_LD_TAIL= @${OBJCOPY} --strip-symbol gcc2_compiled. ${.TARGET} ; \
  251         ${SIZE} ${.TARGET} ; chmod 755 ${.TARGET}
  252 SYSTEM_DEP+= ${LDSCRIPT}
  253 
  254 # Calculate path for .m files early, if needed.
  255 .if !defined(NO_MODULES) && !defined(__MPATH) && !make(install) && \
  256     (empty(.MAKEFLAGS:M-V) || defined(NO_SKIP_MPATH))
  257 __MPATH!=find ${S:tA}/ -name \*_if.m
  258 .endif
  259 
  260 # MKMODULESENV is set here so that port makefiles can augment
  261 # them.
  262 
  263 MKMODULESENV+=  MAKEOBJDIRPREFIX=${.OBJDIR}/modules KMODDIR=${KODIR}
  264 MKMODULESENV+=  MACHINE_CPUARCH=${MACHINE_CPUARCH}
  265 MKMODULESENV+=  MACHINE=${MACHINE} MACHINE_ARCH=${MACHINE_ARCH}
  266 MKMODULESENV+=  MODULES_EXTRA="${MODULES_EXTRA}" WITHOUT_MODULES="${WITHOUT_MODULES}"
  267 MKMODULESENV+=  ARCH_FLAGS="${ARCH_FLAGS}"
  268 .if (${KERN_IDENT} == LINT)
  269 MKMODULESENV+=  ALL_MODULES=LINT
  270 .endif
  271 .if defined(MODULES_OVERRIDE)
  272 MKMODULESENV+=  MODULES_OVERRIDE="${MODULES_OVERRIDE}"
  273 .endif
  274 .if defined(DEBUG)
  275 MKMODULESENV+=  DEBUG_FLAGS="${DEBUG}"
  276 .endif
  277 .if !defined(NO_MODULES)
  278 MKMODULESENV+=  __MPATH="${__MPATH}"
  279 .endif
  280 
  281 # Detect kernel config options that force stack frames to be turned on.
  282 DDB_ENABLED!=   grep DDB opt_ddb.h || true ; echo
  283 DTR_ENABLED!=   grep KDTRACE_FRAME opt_kdtrace.h || true ; echo
  284 HWPMC_ENABLED!= grep HWPMC opt_hwpmc_hooks.h || true ; echo

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