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      1 	$NetBSD: README.compileopts,v 1.17 2023/07/05 16:40:34 lukem Exp $
      2 
      3 This file describes compile-time options for rump kernels.
      4 
      5 Additionally, NetBSD build options will have an effect; see mk.conf(5)
      6 and src/share/mk/bsd.README for a description of NetBSD build options.
      7 
      8 Note: after changing an option, do a clean build.
      9 
     10 Global options:
     11 
     12 
     13     RUMP_DIAGNOSTIC
     14 
     15 values:	yes|no
     16 defval:	yes
     17 effect:	Iff "yes", build with -DDIAGNOSTIC.
     18 
     19 
     20     RUMP_DEBUG
     21 
     22 values:	<defined> / <undefined>
     23 defval:	<undefined>
     24 effect:	Iff defined, build with -DDEBUG.
     25 
     26 
     27     RUMP_LOCKDEBUG
     28 
     29 values:	<defined> / <undefined>
     30 defval:	<undefined>
     31 effect:	Iff defined, build with -DLOCKDEBUG.
     32 
     33 
     34     RUMP_VNODE_LOCKDEBUG
     35 
     36 values:	<defined> / <undefined>
     37 defval:	<undefined>
     38 effect:	Iff defined, build with -DVNODE_LOCKDEBUG.
     39 
     40 
     41     RUMP_KTRACE
     42 
     43 values:	yes|no
     44 defval:	yes
     45 effect:	Iff "yes", build with -DKTRACE.
     46 
     47 
     48     RUMP_LOCKS_UP
     49 
     50 values: yes|no
     51 defval:	no
     52 effect: If "yes", build rump kernel with uniprocess-optimized locking.
     53 	An implication of this is that RUMP_NCPU==1 is required at
     54 	runtime.  If "no", build with multiprocessor-capable locking.
     55 
     56 
     57     RUMP_VIRTIF
     58 
     59 values:	yes|no
     60 defval:	yes
     61 effect:	Iff "yes", build the virt(4) network interface.  Turning this
     62 	off may be necessary on systems that lack the necessary headers,
     63 	e.g. musl libc based Linux.
     64 
     65 
     66     RUMP_CURLWP
     67 
     68 values: hypercall/__thread/register or <undefined>
     69 defval: <undefined>
     70 effect: Control how curlwp is obtained in a rump kernel.  This is
     71 	a very frequently accessed thread-local variable, and optimizing
     72 	access has a significant performance impact.  Note that all
     73 	options are not available on hosts/machine architectures.
     74 	<undefined> - use default implementation (currently "hypercall")
     75 	hypercall   - use a hypercall to fetch the value
     76 	__thread    - use the __thread feature to fetch value via TLS
     77 	register    - use a dedicated register (implies -ffixed)
     78 
     79 
     80     RUMP_NBCOMPAT
     81 
     82 values: comma-separated list of releases; e.g. "60,70";
     83 	or "all" or "default" or "none".  Currently default == all (but
     84 	might not be so in the future)
     85 defval:	all
     86 effect:	Builds NetBSD COMPAT_nn code for each of the elements in the list.
     87 	This option is useful only when building rump kernels for
     88 	NetBSD userspace, and an empty value may be supplied elsewhere.
     89 
     90 
     91 ================================================================================
     92 
     93 Per-component options:
     94 
     95     RUMP_SYM_NORENAME
     96 
     97 values: regexp matching symbol names
     98 defval: <undefined>
     99 effect: Causes matching symbols from the component to not be renamed
    100 	into the rump kernel symbol namespace (rumpns_).  This option
    101 	can only be used in embedded environments where there is full
    102 	control over the platform's namespace.	Conversely, this option
    103 	cannot be used in kernel components which are not meant to be
    104 	tied to a specific platform.  Note: the value is processed by
    105 	make and must be appropriately escaped.  example:
    106 	RUMP_SYM_NORENAME=HYPERVISOR_|block$$
    107 	will not rename "^HYPERVISOR_" or "^block$"
    108 
    109 
    110 ================================================================================
    111 
    112 
    113 The rest of the options described in this file are not intended to be
    114 set by users, but by the package building rump kernels.
    115 
    116 
    117     RUMP_KERNEL_IS_LIBC
    118 
    119 values:	defined / not defined
    120 effect: Iff defined, export normal system call symbols from libc.
    121 	For example, without this option rump_sys_open() is exported.
    122 	With this option, both open() and rump_sys_open() are exported.
    123 	This option is meant for building systems where a rump kernel
    124 	is the only operating system like component.
    125 
    126 
    127     RUMP_LDSCRIPT
    128 
    129 values: no/GNU/sun/ctor
    130 defval: GNU
    131 effect: Select the linker script to be used for linking rump kernel shared
    132 	library components.
    133 	no	- do not use a linker script
    134 	GNU	- use a linker script for GNU ld 2.18 and later
    135 	sun	- use a linker script for the Solaris linker
    136 	ctor	- do not use a linker script, make the code
    137 		  generate __attribute__((constructor))
    138