Using Macports libraries in Xcode gcc

[Ryan Schmidt]

On Jan 13, 2009, at 03:32, Neil wrote:

> My .bash_profile :
> # Add MacPorts directories, if they exist.
> if [ -d /opt/local ]; then
> 	export PATH=/opt/local/bin:/opt/local/sbin:$PATH
> 	export MANPATH=/opt/local/share/man:$MANPATH
> 	export C_INCLUDE_PATH=/opt/local/include
> 	export CPLUS_INCLUDE_PATH=/opt/local/include
> 	alias gcc="gcc -I/opt/local/include -L/opt/local/lib"
> 	alias g++="g++ -I/opt/local/include -L/opt/local/lib"
> 	# if [ -f /opt/local/etc/bash_completion ]; then
> 	# 	. /opt/local/etc/bash_completion
> 	# fi
> fi
>
> IIRC, C_INCLUDE_PATH/CPLUS_INCLUDE_PATH alone didn't work, and thus I
> added the aliases.  But now that I think about it, I should be able to
> remove the former and the later should do everything on it's own.  I'm
> going to try that, I think...

As I understand it, it should be sufficient to set EITHER:

	export C_INCLUDE_PATH=/opt/local/include
	export CPLUS_INCLUDE_PATH=/opt/local/include
	export LIBRARY_PATH=/opt/local/lib

OR:

	export CPPFLAGS=-I/opt/local/include
	export LDFLAGS=-L/opt/local/lib

It should not be necessary in either case to have gcc or g++ be  
aliases to anything.

I'm not sure what the difference is between the above two methods --  
if one is preferable, or if they are for different situations, or  
what. MacPorts uses the CPPFLAGS / LDFLAGS method internally.