[Txr-users] GC bug fixed in GIT.

[Kaz Kylheku]

The following patch fixes a serious GC problem that was exposed under 
GCC 4.5.2,
x86_64 target.

http://git.savannah.gnu.org/cgit/txr.git/commit/?id=bfd057506984287e9ffc3adfa712f44586b7ca7d

The gist of it is that the machine registers were being excluded from 
the root
pointer scan of the garbage collector.

The functions in the garbage collector are heavily inlined, and the 
logic
was depending on the order of variables on the combined stack frame
of the inlined functions.

The test suite should flush out this kind of thing and it did its job.
This is why tests are run with "txr --gc-debug" which performs a 
garbage
collection before every memory allocation (sloooow).

I should change the wording in the configure script to encourage 
people
to run "make tests" before "make install".

Cheers ...