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

     # $FreeBSD: releng/12.0/sys/conf/kern.opts.mk 338643 2018-09-13 14:52:59Z emaste $
     
     # Options set in the build system that affect the kernel somehow.
     
     #
     # Define MK_* variables (which are either "yes" or "no") for users
     # to set via WITH_*/WITHOUT_* in /etc/src.conf and override in the
     # make(1) environment.
     # These should be tested with `== "no"' or `!= "no"' in makefiles.
    # The NO_* variables should only be set by makefiles for variables
    # that haven't been converted over.
    #
    
    # Note: bsd.own.mk must be included before the rest of kern.opts.mk to make
    # building on 10.x and earlier work. This should be removed when that's no
    # longer supported since it confounds the defaults (since it uses the host's
    # notion of defaults rather than what's default in current when building
    # within sys/modules).
    .include <bsd.own.mk>
    
    # These options are used by the kernel build process (kern.mk and kmod.mk)
    # They have to be listed here so we can build modules outside of the
    # src tree.
    
    __DEFAULT_YES_OPTIONS = \
        AUTOFS \
        BHYVE \
        BLUETOOTH \
        CCD \
        CDDL \
        CRYPT \
        CUSE \
        EFI \
        FORMAT_EXTENSIONS \
        INET \
        INET6 \
        IPFILTER \
        IPSEC_SUPPORT \
        ISCSI \
        KERNEL_SYMBOLS \
        MODULE_DRM \
        MODULE_DRM2 \
        NETGRAPH \
        PF \
        REPRODUCIBLE_BUILD \
        SOURCELESS_HOST \
        SOURCELESS_UCODE \
        TESTS \
        USB_GADGET_EXAMPLES \
        ZFS
    
    __DEFAULT_NO_OPTIONS = \
        EXTRA_TCP_STACKS \
        KERNEL_RETPOLINE \
        NAND \
        OFED \
        RATELIMIT
    
    # Some options are totally broken on some architectures. We disable
    # them. If you need to enable them on an experimental basis, you
    # must change this code.
    # Note: These only apply to the list of modules we build by default
    # and sometimes what is in the opt_*.h files by default.
    # Kernel config files are unaffected, though some targets can be
    # affected by KERNEL_SYMBOLS, FORMAT_EXTENSIONS, CTF and SSP.
    
    # Things that don't work based on the CPU
    .if ${MACHINE_CPUARCH} == "arm"
    . if ${MACHINE_ARCH:Marmv[67]*} == ""
    BROKEN_OPTIONS+= CDDL ZFS
    . endif
    .endif
    
    .if ${MACHINE_CPUARCH} == "mips"
    BROKEN_OPTIONS+= CDDL ZFS SSP
    .endif
    
    .if ${MACHINE_CPUARCH} == "powerpc" && ${MACHINE_ARCH} == "powerpc"
    BROKEN_OPTIONS+= ZFS
    .endif
    
    .if ${MACHINE_CPUARCH} == "riscv"
    BROKEN_OPTIONS+= FORMAT_EXTENSIONS
    .endif
    
    # Things that don't work because the kernel doesn't have the support
    # for them.
    .if ${MACHINE} != "i386" && ${MACHINE} != "amd64"
    BROKEN_OPTIONS+= OFED
    .endif
    
    # Things that don't work based on toolchain support.
    .if ${MACHINE} != "i386" && ${MACHINE} != "amd64"
    BROKEN_OPTIONS+= KERNEL_RETPOLINE
    .endif
    
    # EFI doesn't exist on mips, powerpc, sparc or riscv.
    .if ${MACHINE:Mmips} || ${MACHINE:Mpowerpc} || ${MACHINE:Msparc64} || ${MACHINE:Mriscv}
    BROKEN_OPTIONS+=EFI
   .endif
   
   # expanded inline from bsd.mkopt.mk to avoid share/mk dependency
   
   # Those that default to yes
   .for var in ${__DEFAULT_YES_OPTIONS}
   .if !defined(MK_${var})
   .if defined(WITHOUT_${var})                     # WITHOUT always wins
   MK_${var}:=     no
   .else
   MK_${var}:=     yes
   .endif
   .else
   .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
   .error "Illegal value for MK_${var}: ${MK_${var}}"
   .endif
   .endif # !defined(MK_${var})
   .endfor
   .undef __DEFAULT_YES_OPTIONS
   
   # Those that default to no
   .for var in ${__DEFAULT_NO_OPTIONS}
   .if !defined(MK_${var})
   .if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
   MK_${var}:=     yes
   .else
   MK_${var}:=     no
   .endif
   .else
   .if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
   .error "Illegal value for MK_${var}: ${MK_${var}}"
   .endif
   .endif # !defined(MK_${var})
   .endfor
   .undef __DEFAULT_NO_OPTIONS
   
   #
   # MK_* options which are always no, usually because they are
   # unsupported/badly broken on this architecture.
   #
   .for var in ${BROKEN_OPTIONS}
   MK_${var}:=     no
   .endfor
   .undef BROKEN_OPTIONS
   #end of bsd.mkopt.mk expanded inline.
   
   #
   # MK_*_SUPPORT options which default to "yes" unless their corresponding
   # MK_* variable is set to "no".
   #
   .for var in \
       INET \
       INET6
   .if defined(WITHOUT_${var}_SUPPORT) || ${MK_${var}} == "no"
   MK_${var}_SUPPORT:= no
   .else
   .if defined(KERNBUILDDIR)       # See if there's an opt_foo.h
   .if !defined(OPT_${var})
   OPT_${var}!= cat ${KERNBUILDDIR}/opt_${var:tl}.h; echo
   .export OPT_${var}
   .endif
   .if ${OPT_${var}} == ""         # nothing -> no
   MK_${var}_SUPPORT:= no
   .else
   MK_${var}_SUPPORT:= yes
   .endif
   .else                           # otherwise, yes
   MK_${var}_SUPPORT:= yes
   .endif
   .endif
   .endfor
   
   # Some modules only compile successfully if option FDT is set, due to #ifdef FDT
   # wrapped around declarations.  Module makefiles can optionally compile such
   # things using .if !empty(OPT_FDT)
   .if !defined(OPT_FDT) && defined(KERNBUILDDIR)
   OPT_FDT!= sed -n '/FDT/p' ${KERNBUILDDIR}/opt_platform.h
   .export OPT_FDT
   .endif

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