Re: source dependencies cleanup (Perl)?

Richard B. Johnson (
Thu, 5 Dec 1996 20:58:45 -0500 (EST)

On Thu, 5 Dec 1996, Alan Cox wrote:

> > There is precedent for this. While you weren't looking, this got stuck
> > in the kernel source tree (don't know how long ago, but definitely in
> > the 1.3 series):
> >
> > ratboy:/usr/src/linux# head drivers/scsi/
> I've nothing against perl. I'd prefer bash if possible for critical stuff.
> One reason for this is porting perl and getting it working right when
> moving to a new architecture is not trivial.
> Alan

Maybe it's a stupid question, but why not 'C'? Portability is enhanced
and, if it compiles and links, you know the 'C' compiler is installed.

Building a list of dependencies for .c and .S files, although not trivial
in any language, seems to me to be something that 'C' would be real good
at doing. The executable result will run as fast as directory searches
will allow. You will certainly be I/O bound rather than CPU bound. The
Gnu Compiler was slow because it is a Compiler. The preprocessor doesn't
even eat white-space so there is a lot more "string-stuff" being sifted
through than is necessary.

I think that a 'C' program designed to do the job would be the way to
go. I have a "depend" program that runs on another platform that makes
the "Makefile.tmp" that 'make' actually uses. All the dependencies for
all the files in a directory are concatenated with a fixed header to make
this Makefile.tmp. It runs very quickly although I have not timed it.

Dick Johnson
Richard B. Johnson
Project Engineer
Analogic Corporation
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