[GRASS5] CVS version of grass5 failing to compile nviz & r.in.gdal because of -ldl flag

[Glynn Clements]

Scott W Mitchell wrote:

> OK, sorry to be answering my own post for the second time, but I found 
> the answer, so here it is to make sure it's in the archives for the 
> next person... at least I learned and hopefully nobody else (i.e. Glynn 
> - thanks for all the help !) will expend effort on this before seeing 
> that I have an answer.
> 
> Took a break and with a fresh mind, finally paid attention to the fact 
> that I only had the .dylib version of libdl, and investigated that 
> further.  Turned out that at some point the fink dlcompat package got 
> broken into 3 sub-packages, and I didn't have the -dev package that is 
> needed to install the .a version of the library, AND it installs a 
> "versionless" softlink to libdl.0.dylib, taking care of the version 
> number that I worked around in my previous post.
> 
> So the answer is that Mac OS X users will need the dlcompat-dev package 
> installed if they are using fink - there are also other ways to install 
> the dlcompat package, but no matter how they do it, they need those 
> bits - you want all three libdl files available:

From a user's perspective, that probably counts as an answer, but from
a developers perspective it's only half of an answer. It explains why
linking NVWISH2.2 failed; however, it doesn't explain why linking the
configure test succeeded.

The whole point of the configure test is to determine whether a
particular set of switches will result in successfully constructing a
program which requires a particular function. A false positive is the
worst possible result, because configure claims that everything is OK,
then goes on to add switches will break the build process.

-- 
Glynn Clements <glynn.clements@virgin.net>