Wireshark · Wireshark-dev: Re: [Wireshark-dev] [Wireshark-commits] rev 38304: /trunk/epan/dissectors/ /trunk/epan/dissectors/:

[Jeff Morriss <jeff.morriss.ws@xxxxxxxxx>]

Stephen Fisher wrote:
> On Tue, Aug 02, 2011 at 11:22:03AM -0400, Jeff Morriss wrote:
> > > If there was a way to tell if it was changed and only then generate it, 
> > > I would say yes.  If it is re-generated without changes, I suspect the 
> > > compiler would recompile it every time.
> > 'make' does that for you :-)
>
> Yes.. :) but what about if the file's modification time is changed 
> because it was re-generated even though the contents of the file are the 
> same?  Or will the generating program not re-generate it?

'make' won't regenerate it unless the source files have changed (e.g., 
if you type "make" twice in asn1/snmp, it'll only run asn2wrs once). 
BUT, we do have some room for improvement there because it does COPY the 
source over to epan/dissectors twice.  A "cp -p" (assuming that's 
portable and has a Windows equivalent) would help (by preserving the 
timestamps) as would simply sending the generation output directly to 
epan/dissectors .