Re: ensure that generated files are read-only

[Paul Eggert]

Ralf Wildenhues <address@hidden> writes:

>> alloca.h: alloca_.h
>>      $(LN_F_S) $(srcdir)/alloca_.h $@
>> 
>> where $(LN_FS) expands to "ln -fs" in the typical case, or to
>> "rm -f $@ && cp" on hosts where "ln -fs" doesn't work (e.g., Solaris 9
>> and earlier).
>
> I like it, but it runs a bit contrary to command optimization; for
> example, the HP-UX make I tested will try to update the symlink target
> upon every invocation, not just the first one.

Ouch.  Well, I suppose we can test for that performance bug too, and
use the fallback expansion on HP-UX as well.