xref: /freebsd/sys/conf/kern.opts.mk (revision dad64f0e) 
1# $FreeBSD$
2
3# Options set in the build system which affect the building of kernel
4# modules. These select which parts to compile in or out (eg INET) or which
5# parts to omit (eg CDDL or SOURCELESS_HOST). Some of these will cause
6# config.mk to define symbols in various opt_*.h files.
7
8#
9# Define MK_* variables (which are either "yes" or "no") for users
10# to set via WITH_*/WITHOUT_* in /etc/src.conf and override in the
11# make(1) environment.
12# These should be tested with `== "no"' or `!= "no"' in makefiles.
13# The NO_* variables should only be set by makefiles for variables
14# that haven't been converted over.
15#
16
17# Note: bsd.own.mk must be included before the rest of kern.opts.mk to make
18# building on 10.x and earlier work. This should be removed when that's no
19# longer supported since it confounds the defaults (since it uses the host's
20# notion of defaults rather than what's default in current when building
21# within sys/modules).
22.include <bsd.own.mk>
23
24# These options are used by the kernel build process (kern.mk and kmod.mk)
25# They have to be listed here so we can build modules outside of the
26# src tree.
27
28KLDXREF_CMD?=	kldxref
29
30__DEFAULT_YES_OPTIONS = \
31    AUTOFS \
32    BHYVE \
33    BLUETOOTH \
34    CCD \
35    CDDL \
36    CRYPT \
37    CUSE \
38    DTRACE \
39    EFI \
40    FORMAT_EXTENSIONS \
41    INET \
42    INET6 \
43    IPFILTER \
44    IPSEC_SUPPORT \
45    ISCSI \
46    KERNEL_SYMBOLS \
47    NETGRAPH \
48    OFED \
49    PF \
50    SCTP_SUPPORT \
51    SOURCELESS_HOST \
52    SOURCELESS_UCODE \
53    SPLIT_KERNEL_DEBUG \
54    TESTS \
55    USB_GADGET_EXAMPLES \
56    ZFS
57
58__DEFAULT_NO_OPTIONS = \
59    BHYVE_SNAPSHOT \
60    EXTRA_TCP_STACKS \
61    INIT_ALL_PATTERN \
62    INIT_ALL_ZERO \
63    KERNEL_RETPOLINE \
64    RATELIMIT \
65    REPRODUCIBLE_BUILD
66
67# Some options are totally broken on some architectures. We disable
68# them. If you need to enable them on an experimental basis, you
69# must change this code.
70# Note: These only apply to the list of modules we build by default
71# and sometimes what is in the opt_*.h files by default.
72# Kernel config files are unaffected, though some targets can be
73# affected by KERNEL_SYMBOLS, FORMAT_EXTENSIONS, CTF and SSP.
74
75# Things that don't work based on the CPU
76.if ${MACHINE} == "amd64"
77# PR251083 conflict between INIT_ALL_ZERO and ifunc memset
78BROKEN_OPTIONS+= INIT_ALL_ZERO
79.endif
80
81.if ${MACHINE_CPUARCH} == "powerpc" && ${MACHINE_ARCH} == "powerpc"
82BROKEN_OPTIONS+= ZFS
83.endif
84
85# Things that don't work because the kernel doesn't have the support
86# for them.
87.if ${MACHINE} != "i386" && ${MACHINE} != "amd64"
88BROKEN_OPTIONS+= OFED
89.endif
90
91# Things that don't work based on toolchain support.
92.if ${MACHINE} != "i386" && ${MACHINE} != "amd64"
93BROKEN_OPTIONS+= KERNEL_RETPOLINE
94.endif
95
96# EFI doesn't exist on powerpc, or riscv
97.if ${MACHINE:Mpowerpc} || ${MACHINE:Mriscv}
98BROKEN_OPTIONS+=EFI
99.endif
100
101.if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
102__DEFAULT_NO_OPTIONS += FDT
103.else
104__DEFAULT_YES_OPTIONS += FDT
105.endif
106
107# expanded inline from bsd.mkopt.mk to avoid share/mk dependency
108
109# Those that default to yes
110.for var in ${__DEFAULT_YES_OPTIONS}
111.if !defined(MK_${var})
112.if defined(WITHOUT_${var})			# WITHOUT always wins
113MK_${var}:=	no
114.else
115MK_${var}:=	yes
116.endif
117.else
118.if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
119.error "Illegal value for MK_${var}: ${MK_${var}}"
120.endif
121.endif # !defined(MK_${var})
122.endfor
123.undef __DEFAULT_YES_OPTIONS
124
125# Those that default to no
126.for var in ${__DEFAULT_NO_OPTIONS}
127.if !defined(MK_${var})
128.if defined(WITH_${var}) && !defined(WITHOUT_${var}) # WITHOUT always wins
129MK_${var}:=	yes
130.else
131MK_${var}:=	no
132.endif
133.else
134.if ${MK_${var}} != "yes" && ${MK_${var}} != "no"
135.error "Illegal value for MK_${var}: ${MK_${var}}"
136.endif
137.endif # !defined(MK_${var})
138.endfor
139.undef __DEFAULT_NO_OPTIONS
140
141#
142# MK_* options which are always no, usually because they are
143# unsupported/badly broken on this architecture.
144#
145.for var in ${BROKEN_OPTIONS}
146MK_${var}:=	no
147.endfor
148.undef BROKEN_OPTIONS
149#end of bsd.mkopt.mk expanded inline.
150
151#
152# MK_*_SUPPORT options which default to "yes" unless their corresponding
153# MK_* variable is set to "no".
154#
155.for var in \
156    INET \
157    INET6
158.if defined(WITHOUT_${var}_SUPPORT) || ${MK_${var}} == "no"
159MK_${var}_SUPPORT:= no
160.else
161.if defined(KERNBUILDDIR)	# See if there's an opt_foo.h
162.if !defined(OPT_${var})
163OPT_${var}!= cat ${KERNBUILDDIR}/opt_${var:tl}.h; echo
164.export OPT_${var}
165.endif
166.if ${OPT_${var}} == ""		# nothing -> no
167MK_${var}_SUPPORT:= no
168.else
169MK_${var}_SUPPORT:= yes
170.endif
171.else				# otherwise, yes
172MK_${var}_SUPPORT:= yes
173.endif
174.endif
175.endfor
176
177.if ${MK_SPLIT_KERNEL_DEBUG} == "no"
178MK_KERNEL_SYMBOLS:=	no
179.endif
180
181.if ${MK_CDDL} == "no"
182MK_DTRACE:=	no
183.endif
184
185# Some modules only compile successfully if option FDT is set, due to #ifdef FDT
186# wrapped around declarations.  Module makefiles can optionally compile such
187# things using .if !empty(OPT_FDT)
188.if !defined(OPT_FDT) && defined(KERNBUILDDIR)
189OPT_FDT!= sed -n '/FDT/p' ${KERNBUILDDIR}/opt_platform.h
190.export OPT_FDT
191.if empty(OPT_FDT)
192MK_FDT:=no
193.else
194MK_FDT:=yes
195.endif
196.endif
197