Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Sat, 17 Jul 2021 11:44:27 -0700

On 7/16/21 12:47 PM, Siddons, David via Tech-talk wrote:
> Hi Andrew,
>   It doesn't seem to. The file is clearly compiled and included in the support library:
> 
> /home/peter/quick-start/rtems/5/bin/arm-rtems5-ar rc   libmyexampleSupport.a    xxxRecord.o devXxxSoft.o dbSubExample.o devmyexampleVersion.o myexampleHello.o initTrace.o tarball.o

I'm not sure my 'epicsRtemsFSImage' trick will work from a library.

Try moving tarball.c to myexample_SRCS.

> myexample_SRCS += tarball.c

And I think you can just remove '..._SRCS += tarball.h'.
It's probably not doing anything helpful.

> arm-rtems5-nm libmyexampleSupport.a |grep epicsRtems
> 00000000 R epicsRtemsFSImage
> 00000000 R epicsRtemsFSImage_size
> 
> but not in the myexample executable:
> 
> peter@peter-OptiPlex-7070:~/test_ioc/bin/RTEMS-beagleboneblack$ arm-rtems5-nm myexample |grep epicsRtems
> 8060306c V epicsRtemsFSImage
> 
> which is the weak symbol.
> Pete.
> 
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> *From:* Johnson, Andrew N. <anj at anl.gov>
> *Sent:* Friday, July 16, 2021 3:21 PM
> *To:* Siddons, David <siddons at bnl.gov>
> *Cc:* EPICS tech-talk <tech-talk at aps.anl.gov>
> *Subject:* Re: linking in IOC makefile for RTEMS
>  
> Hi Pete,
> 
> Just an idea, does it make any difference if you remove the tarball.h file from your _SRCS variable (you shouldn’t include .h files in _SRCS anyway, if you want to install them they go into INC instead)?
> 
> - Andrew
> 
> 
>> On Jul 16, 2021, at 2:08 PM, Siddons, David via Tech-talk <tech-talk at aps.anl.gov <mailto:tech-talk at aps.anl.gov>> wrote:
>>
>> I have an RTEMS test IOC (generated using makeBaseApp) to which I've added a source file which declares a large array (actually, a compiled-in file system). The Makefile has:
>>
>> ......
>> # rather than directly into the IOC application, that
>> # causes problems on Windows DLL builds
>> myexampleSupport_SRCS += dbSubExample.c
>> myexampleSupport_SRCS += devmyexampleVersion.c
>> myexampleSupport_SRCS += myexampleHello.c
>> myexampleSupport_SRCS += initTrace.c
>> myexampleSupport_SRCS += tarball.h
>> myexampleSupport_SRCS += tarball.c
>>
>> where the tarball files are my additions. The C file contains:
>>
>> /*
>>  *  Declarations for C structure representing binary file epicsRtemsFSImage
>>  *
>>  *  WARNING: Automatically generated -- do not edit!
>>  */
>>
>> #include <sys/types.h>
>>
>> const unsigned char epicsRtemsFSImage[] = {
>>   0x74, 0x61, 0x72, 0x62, 0x61, 0x6c, 0x6c, 0x2f, 0x00, 0x00, 0x00, 0x00, 
>>   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
>>   .....etc, then:
>>
>> const size_t epicsRtemsFSImage_size = sizeof(epicsRtemsFSImage);
>>
>>
>> The EPICS base libraries contain a weak reference to this same symbol (from libcom/RTEMS/init.c) , and I expected this definition to overwrite the weak one, but inspection of the executable only shows the weak one, and the size variable is not referenced at all. What am I missing? It seems that the tarball file is compiled, but not linked.
>>
>> Pete.
> 
> -- 
> Complexity comes for free, simplicity you have to work for.
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System