Re: Optimizations

[Subramanian Krishnan <krishnan@aradhana.india.hp.com>]

> 
> > 
> > 
> > Hi there!
> > 
> > Has anyone ever stumbled over a situation where comiling an application
> > with optimizations turned on (as opposed to compiling with debugging info)
> > makes the app not work anymore? I experienced it yesterday, and it took
> > some time to find out... Basically it gets stuck in code that works just
> > fine with debugging turned on. The code is a select() and a read(), i.e.
> > system calls. Maybe I do something weird, but that part has worked for
> > ages... I get no warnings when compiling, except for a:
> > 
> > /usr/include/socketbits.h:173: warning: ANSI C++ forbids zero-size array
> > `__cmsg_data'
> > 
> > This is also something I'd like to get rid of. It's an warning, not
> > serious, but it comes from _every_ file I compile, and it's much harder to
> > spot the more serious because of it.
> > 
> > The flags I use for compilation are:
> > 
> > ##########################################################################
> > # Specific definitions for a 'release' and 'debug' compile
> > ##########################################################################
> > RELEASECFLAGS =3D -pedantic -O2 -Wall -I$(INCDIR) -D_REENTRANT
> > RELEASELFLAGS =3D -D_REENTRANT -L$(LIBDIR)
> > 
> > DEBUGCFLAGS   =3D -pedantic -ggdb -Wall -I$(INCDIR) -D_REENTRANT
> > DEBUGLFLAGS   =3D -D_REENTRANT -L$(LIBDIR)
> > 
> > The only real difference is the '-ggdb' is replaced by a '-O2'. Does
> > anyone have any good ideas as to what might go wrong here?
> > 
> > =09Chakie
> > 
> > ---------------------+-----------------------------------------------------=
> > -
> >  Jan 'Chakie' Ekholm |    CS at =C5bo Akademi University, Turku, Finland
> >     Linux Inside     | I'm the blue screen of death, no-one hears you screa=
> > m
> > 
> > 
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> 
>