Hi all,

while testing Ingo's latest patch I found a segfault in makewhatis
involving -a and symlinks which I can also reproduce on unpatched CVS.

To reproduce do something like this

mkdir test-manpath
mkdir -p test-manpath/de/man1
ln -sf $(realpath test-manpath/de) test-manpath/DE

So we have a base directory which has one child that is a symlink. This
symlink points to a directory below the base directory which contains
another directory. Running makewhatis -a test-manpath will then segfault
with the following backtrace:

#0  0x000000000041a9e1 in dbadd (dba=dba@entry=0x471050,
mpage=mpage@entry=0x473560) at mandocdb.c:2140
#1  0x000000000041b0ae in mpages_merge (dba=dba@entry=0x471050,
mp=mp@entry=0x46c2b0) at mandocdb.c:1294
#2  0x000000000041ca13 in mandocdb (argc=1, argc@entry=3,
argv=<optimized out>, argv@entry=0x7fffffffd678) at mandocdb.c:513
#3  0x000000000041dffa in main (argc=3, argv=0x7fffffffd678) at main.c:165

Full backtrace is attached as well. I've stared at mpages_merge for a
little bit, but haven't figured out how this is happening so far.

Cheers,

  Lukas