Experimental Physics and
Industrial Control System

Dirk Zimoch <[email protected]> · Wed, 07 Mar 2012 09:50:56 +0100

Hi Lewis,

Can it be that you did not do a "make clean" when you changed the

optimization level?

I am speculating a bit now:

These two functions,

epicsSingleton<localHostName>::reference::~reference(void) and

epicsSingleton<localHostName>::reference::operator->(void) both contain

'assert' (see src/libCom/cxxTemplates/epicsSingleton.h).

'assert' is a macro:
#   define assert(exp) ((exp) ? (void)0 : \
        epicsAssert(__FILE__, __LINE__, #exp, epicsAssertAuthor))

Depending on the optimization level, '(void)0' may be eliminated and the

code becomes shorter (by 4 bytes = 1 PPC instruction).

Try to 'make clean' in the epics base top directory and compile again.

Dirk

J. Lewis Muir wrote:

On 3/2/12 10:51 AM, J. Lewis Muir wrote:

When building EPICS Base 3.14.12.2 (+ Known Problems patches)
for vxWorks-ppc603, vxWorks-ppc604, and vxWorks-ppc604_long, I'm
getting warnings like this:

===
/opt/vxworks-tornado-2.0.2/host/x86-linux/bin/ldppc -r -o
callbackTest  -L../../../../lib/vxWorks-ppc603/
-L/opt/vxworks-tornado-2.0.2/host/x86-linux/powerpc-wrs-vxworks/lib
          callbackTest.o    -ldbIoc -ldbStaticIoc -lca -lCom
Warning: size of symbol
`_$_Q2t14epicsSingleton1Z13localHostName9reference' changed from
160 to 164 in cac.o
Warning: size of symbol
`__rf__Q2t14epicsSingleton1Z13localHostName9reference' changed
from 128 to 132 in cac.o
===

I happened to be compiling with -O0.  I tried compiling with -O2
and these "size of symbol changed" warnings went away.  Strange.

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System