[Qemu-devel] PARAMS

[Qemu-devel] PARAMS

[David Holman]

Hi,
	I've been looking at the QEMU source and I came across the PARAMS 
macro in dis-asm.h. Why is this necessary? It looks to me like what's 
comes out of PARAMS() is what goes into it, so why even have it? Sorry 
if this is a dumb question, I searched the archives for it and didn't 
find anything.

Thanks,
David

Re: [Qemu-devel] PARAMS

[Johan Rydberg]

David Holman <davholman@softhome.net> wrote:

: Hi,
: 	I've been looking at the QEMU source and I came across the PARAMS 
: macro in dis-asm.h. Why is this necessary? It looks to me like what's 
: comes out of PARAMS() is what goes into it, so why even have it? Sorry 
: if this is a dumb question, I searched the archives for it and didn't 
: find anything.

dis-asm.h is from GNU binutils, which is supposed to work with really
old compilers which doesn't support parameter prototypes.  Therefor
you define the PARAMS-macro; it expands to () for old compilers and
to args for newer ones.  That's also why a lot of the GNU code have 
K&R function heads.  But I think they have started to move away from
that (GDB has at least.)

-- 
Johan Rydberg, Free Software Developer, Sweden
http://rtmk.sf.net | http://www.nongnu.org/guss/