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<== Date ==> <== Thread ==>
Subject: linking in IOC makefile for RTEMS
From: "Siddons, David via Tech-talk" <tech-talk at aps.anl.gov>
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Date: Fri, 16 Jul 2021 19:08:28 +0000
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.
Replies:
Re: linking in IOC makefile for RTEMS Johnson, Andrew N. via Tech-talk
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