#54 cscope.in.out doesn't migrate

[Anonymous]

I've built cscope 15.3 for Solaris and for RH Linux.

While the cscope.out database migrates between the
two systems, meaning I can build on one system and
read it on the other, the same is not true for the
reverse lookup files. If I build with -q on Linux,
Solairs can't take advantage of the reverse index
files it built and vice-versa. Could there be an
endian problem in the file format?

[Hans-Bernhard Broeker]

Logged In: YES
user_id=27517

Could easily be, yes. The reverse index created by -q mode
is a native binary file. The code dealing with it (invlib.c)
is so convoluted that there's hardly a chance anybody will
be going over it and make it endian-safe. It took several
tries (and massive changes to a private copy of the sources)
to make it even work at all on a non-VAX-o-centric type of
machine (Alpha CPU).

Indeed, there's a plan waiting for action that we dump this
module altogether and replace it by a proper database
library (Berkeley DB or similar).

[Jason Duell]

Logged In: YES
user_id=125727

I'd like to take a look at this at some point. There are
some other problems I've discovered with the -q index files.

A good first step might be to make the -q index files work
with the '-c' option: right now they are still compressed
even if you pass that flag.

[Hans-Bernhard Broeker]

Logged In: YES
user_id=27517

Storing the additional .po.out, and .in.out files in ASCII
mode is really not feasible. These files are stock full of
internal references to binary file positions, and all those
numbers are themselves stored in binary format. Mapping
this structure to an ASCII format may very well be harder
than just tracking down any problems you observed directly
in an interactive debugging session.

I.e. it's not "compression" as in the cscope.out file that
makes these files have non-ASCII contents, it's the nature
of the files
themselves.

There really isn't much point in fiddling with -q mode (i.e.
invlib.[ch]) --- it has be rewritten from scratch, or
replaced by a database library that stores portable files.

If you know of any problems with -q mode right now, please
describe them (mail to the list, or file them as bug reports
here --- you choose).

[Neil Horman]

Logged In: YES
user_id=827328

If you're interested in estimating the extent of the problem
in the inverted index, build an inverted index on both
solaris and linux, and then run cmp on the two indicies.
The offsets and differences will give you a decent hint as
to what (at least a subset of) the problems are.