Re: [Plib-users] Building Plib on Mac OSX (Darwin)

[Reed H. <re...@ze...>]

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 > The "-O6" stuff was removed recently in CVS.

 > Dunno - some attempt to get more speed by increasing the optimisation 
level
 > I guess.

Yeah, except gcc 2.95.2 only goes up to -O3, according to the 
documentation I have...
and it fails with -O6 :)


 > We have to find a way to determine whether the machine we are 
compiling on
 > is running Mac OS (X) *without* forcing the user to tell us ...

autoconf will detect this.
I think AC_CANONICAL_SYSTEM will set a variety of variables, including 
"build_alias"
"host_alias", etc??
On darwin this will have the value "powerpc-apple-darwin5.2"

uname will also output "Darwin".

Also, the compiler probably defines some symbol (__DARWIN__ or something)
that can be detected in preprocessing. I will find that out.


 >Yes.  Looking to see if glut.h is in <GLUT/glut.h> might be one way.

 >> 4. changed int vp [ 4 ] ; on line 202 of ssg.cxx to GLint vp [ 4 ] ;
 >> 5. changed int ww; on line 112 of ssgLoadTexture.cxx to GLint ww;

 > Why exactly was this neccessary ?

 > Perhaps they somehow made the GL types *not* be a simple typedef or 
#define
 > of the basic types.  If that's true then writing good code is going to 
be
 > VERY painful.


yup...  this OpenGL demands GLint...  will this break existing 
applications on Darwin?
If so, c'est la vie, I guess.  It was only those two lines in ssg 
though, none in sg or util.
I haven't tried building the other libraries yet.

Is this a big problem do you think?


 > Yes - but surely the old way must work too?

Only with some sneaky hacks. All the directories are different, nothing 
like normal unix system.

Normal systems have /usr/lib/libfoo.so or /usr/lib/group/libfoo.so (in 
which case you use
- - - -L /usr/lib/group) , and /usr/include/foo.h or
/usr/include/group/foo.h (in which case you use #include <group/foo.h>).
Darwin has /System/Library/Frameworks/group.framework/Headers/foo.h and
/System/Library/Frameworks/group.framework/Libraries/libfoo.dylib.


Actually, I first tried symlinks  from /usr/local/lib/GL ->
/System/Library/Frameworks/OpenGL.framework/Libraries and likewise for 
headers,
but ran into all kinds of little problems. It was easier just to link to 
the framework.


Fink <http://fink.sf.net> includes open GL libraries (Mesa?) with the 
XFree port, I *think*,
but I diddn't want to get tangled with those just yet. However, maybe 
that would work better.
I can look at that too.


 > Apple clearly don't seem overly concerned about portability.  Why else 
would
 > they have moved glut.h ?

All the framework stuff is inherited from NeXt, I think.  Politics 
probably :P.
Frameworks *do* facilitate distribution of libraries without install 
scripts
that move copy files around (they can just be dropped into place), which 
is nice.

 > Hmm ... who knows how to properly implement that stuff in our (up to 
now,
 > pretty simple) autoconf-based build system ?

 > I doubt you could use autoconf.  It has things like '-L' and '-I' 
directives
 > hardwired in.

Maybe just do what I did, but in the script-- detect darwin and append 
the framework
directives, checking for OpenGL first, maybe, but it should be in any 
stock system AFAIK.
I'm not sure how to implement this in autoconf though.

There might be a way to get autoconf on Darwin to add in the frameworks 
automatically,
though.  I'll look for docs on it.


 > Perhaps we have to give up and treat it like we do MSVC and Borland 
under
 > Windoze where we just distribute a complete parallel build environment.

This is another solution, It's a bit of grunt work setting up the Apple 
Project
  Builder files, but it's not to bad.  The plib components can be made 
into frameworks,
and contianed in this other concept darwin has of "umbrella" 
frameworks...
I might be able to do this, if there is interest.

Want me to send a patch for autoconf and code if I get it all more or 
less working
correctly?  My motive is working on my apple laptop, rather than my 
linux server/
desktop... which doesnt have a monitor :)  But I can't spend too much 
time on it, I
want to *use* plib :D I can get a monitor...

Also:
	1. is there a really minimal sample program I can use to test?
	2. I ran configure script with --without-x. How important is X 
windows to any part of
	using plib?

thanks

reed

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