[leafnode-list] [beta] build process: dependency handling

[clemens fischer]

'uname -rms'
FreeBSD 6.2-PRERELEASE i386

'gcc --version'
gcc (GCC) 3.4.6 [FreeBSD] 20060305
...

when leafnode-2 gets built, i see lines like:

  if gcc -DHAVE_CONFIG_H -I. (more compiler switches)
  -MT expire_lookup.o -MD -MP -MF ".deps/expire_lookup.Tpo" -c -o expire_lookup.o
  expire_lookup.c;
  then mv -f ".deps/expire_lookup.Tpo" ".deps/expire_lookup.Po";
  else rm -f ".deps/expire_lookup.Tpo"; exit 1; fi

the Makefile also has, of course:

  include ./$(DEPDIR)/expire_lookup.Po

i had a look at this dependency rule file.  it shows the target twice:

  expire_lookup.o expire_lookup.o: expire_lookup.c leafnode.h config.h (etc.)

how come? only one of "expire_lookup.o" is needed, the extra won't hurt,
but it doesn't help, either.  if it isn't edited in after the compiler
run, the compiler would be at fault.

regards, clemens