[RTEMS Project] #3351: libbsd: Introduce buildsets that allow to enable or disable parts of libbsd to get for example smaller or faster configurations. (was: libbsd: Add support for conditional compilation of modules and compiler flags)

[RTEMS trac]

#3351: libbsd: Introduce buildsets that allow to enable or disable parts of libbsd
to get for example smaller or faster configurations.
--------------------------------+---------------------------------
 Reporter:  Christian Mauderer  |       Owner:  Christian Mauderer
     Type:  enhancement         |      Status:  assigned
 Priority:  normal              |   Milestone:  Indefinite
Component:  network/libbsd      |     Version:  5
 Severity:  normal              |  Resolution:
 Keywords:  libbsd waf IPSec    |  Blocked By:
 Blocking:                      |
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Comment (by Christian Mauderer):

 To make things more user friendly I dropped the original intend to allow
 to set the compiler flags with the configuration. Otherwise a user would
 have to know that he has to drop for example the netinet6 module ''and''
 remove the INET6 compiler flag.

 Instead, I now generate a header file that has defines for all enabled
 modules. That also allows to (for example) simply switch off the
 constructor for wifi in ifconfig. Without the header, it would have been
 necessary to enable a "no_wifi" module that provides an empty
 implementation of that constructor when the wifi-modules are disabled.

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Ticket URL: <http://devel.rtems.org/ticket/3351#comment:14>
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