Re: [Xenomai-core] enum rtdm_selecttype

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Philippe Gerum wrote:
 > Gilles Chanteperdrix wrote:
 > > Philippe Gerum wrote:
 > >  > Gilles Chanteperdrix wrote:
 > >  > > Hi Jan,
 > >  > > 
 > >  > > when compiling xenomai v2.4.x for ARM with gcc 4.2.1, I get plenty of
 > >  > > warnings like:
 > >  > > xenomai-arm/kernel/xenomai/skins/posix/syscall.c:38:
 > >  > > xenomai-arm/include/xenomai/rtdm/rtdm_driver.h:206: warning: parameter has incomplete type
 > >  > > 
 > >  > > So it seems gcc 4.2.1 does not like the enum being used in function
 > >  > > prototypes without being defines. So, could we move the enum definition
 > >  > > before the functions using it ?
 > >  > > 
 > >  > 
 > >  > We can sort this out with a simple forward declaration.
 > > 
 > > That is the way it is done today, but gcc 4.2.1 seems not to like
 > > it. Maybe recent C standards allow the compiler to pick the smallest type
 > > for the enum as C++ does ?
 > > 
 > 
 > Or any integral type the implementation sees fit actually. Well, yes, maybe it
 > is indeed bits of the C++ standard dripping on the C implementation of GCC,
 > especially if forward decl of enums is not explicitly defined by the C standard.

Actually it is gcc 3.4 which does not like the forward decl, not gcc 4.2

-- 


					    Gilles.