Hi Christian,
GNU ar (GNU Binutils) 2.19
FYI 2.21 is now out and 2.22 is due soon...
and the commands:
ar rP a.ar b/c.o
ar rP a.ar b/c.o
will add the object "c.o" twice in the archive "a.ar".
is this the correct behaviour?
Yes. Although it certainly is not intuitive. What is happening is that
the first invocation of ar adds c.o to the newly created archive. (Note
the file is stored as "c.o" not "b/c.o" as GNU format archives do *not*
include pathname information).
The second invocation of ar then adds b/c.o again because you have used
the P command modifier. This tells ar to expect a non-GNU format
archive where pathnames *are* retained. Thus the filename matching part
of the "r" command checks "b/c.o" (from the command line) against "c.o"
(from the archive), decides that they are different, and so adds "c.o"
again.
the constraint also is that my "a.ar" archive will have other objects
"c.o" on different paths, and I do not want to be replaced by object
"b/c.o".
how to handle relative paths in the GNU binutils-ar?
The only way to do this is to create a thin archive in conjunction with
the P modifier. For example:
% ar rTP a.ar b/c.o
% ar t a.ar
b/c.o
% ar rTP a.ar b/c.o
% ar t a.ar
b/c.o
% ar rTP a.ar c/c.o
% ar t a.ar
b/c.o
c/c.o
Please note however that thin archives do not contain the actual objects
themselves, just the (relative) paths to the objects. So you cannot
move them or export them.
Cheers
Nick
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