Re: "Size of symbol changed" warnings building EPICS Base 3.14.12.2

[Dirk Zimoch <dirk.zimoch@psi.ch>]

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