[Rpm-maint] Macro change while expanding the macro itself

[Michael Schroeder]

And another patch to be discussed. We've got an esotheric macro
usage that deletes its own definition while it is expanded.

Here's a demo:

$ cat ~/.rpmmacros
%package %?_suse_insert_debug_package%%package
%_suse_insert_debug_package \
  %undefine _suse_insert_debug_package \
  %debug_package
$ rpm --eval %package
  %debug_packag%package

For some reason this worked in rpm-4.8 (probably because of a
memory leak). I guess it was also broken if the macro is changed
instead of the %undefine.
Anyway, this should either work or procuce an error. Currently
it accesses already freed memory, which is bad.

A small patch to make it work is attached.

Cheers,
  Michael.

-- 
Michael Schroeder                                   mls at suse.de
SUSE LINUX Products GmbH,  GF Jeff Hawn, HRB 16746 AG Nuernberg
main(_){while(_=~getchar())putchar(~_-1/(~(_|32)/13*2-11)*13);}
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