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README.md: Rework FreeBSD kernel options

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Sebastian Huber 2019-03-17 09:54:32 +01:00
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@ -189,13 +189,14 @@ Please make sure you use the exact command or you might find you are cloning
the whole of the FreeBSD source tree. If that happens simply git ^C and try
again.
FreeBSD Kernel Options
----------------------
FreeBSD Developer Support
-------------------------
The --freebsd-option provides a tool you can set special kernel options. This
is a developer tool and should only be used if you are familiar with the
internals of the FreeBSD kernel and what these options do.
You can set FreeBSD kernel options during build configuration with the
--freebsd-option=a,b,c,... configuration command option. This is an advanced
option and should only be used if you are familiar with the internals of the
FreeBSD kernel and what these options do. Each of the comma separated options
is converted to uppercase and passed as a compiler command line define (-D).
The options are listed in:
@ -208,5 +209,8 @@ configure with:
--freebsd-options=bootverbose,verbose_sysinit,bus_debug
```
The LibBSD Waf support splits the options and converts them to uppercase and
adds them -D options on the compiler command line.
To enable kernel internal consistency checking use:
```
--freebsd-options=invariants,invariant_support
```