Re: where are the vxworks os library files

[Andrew Johnson <anj@aps.anl.gov>]

Hi,

On Tuesday 04 January 2011 05:19:46 王林 wrote:
> I have been confused about where the vxworks os library files are for a
> long time, since the document EPICS-3.14 README said that you must have
> Tornado 2 installed if any of your target systems are vxWorks systems.
> Tornado 2 provides the cross-compiler and header files needed to build for
> these target systems, which means that we don't need library files for
> vxworks program development, and it seems very diffenent from Linux and
> Windows. After reading some documents, now can I understand it as this?

You are correct that the way we have traditionally done EPICS development for 
vxWorks is different than for the workstation operating systems such as Linux 
and Windows.

> The vxworks os libraries have already been compiled into the vxworks kernel
> image, the module will find the os libraries by the vxworks symbol table
> after loaded to target instead of linking on the host before loaded. Am I
> right? Some comment?

Correct, the IOC image that we build for vxWorks targets contains only the 
EPICS code, and relies on the OS libraries having already been loaded as part 
of the vxWorks boot image.

It should be possible to build an IOC image as a stand-alone bootable vxWorks 
binary, but the EPICS build system does not contain the rules necessary to do 
that and I'm not aware of anyone having actually done it.  This would require 
linking with the vxWorks OS library files and thus would be more conventional 
(we do build binaries for RTEMS like this).  If anyone manages to do this I 
would be interested in adding the additional rules to future releases of EPICS 
Base.

- Andrew
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