ports/77707: Fix for ports/77403 introduced circular dependency in ports tree

[Bartosz Fabianowski]

The following reply was made to PR ports/77707; it has been noted by GNATS.

From: Bartosz Fabianowski <freebsd at chillt.de>
To: Mark Linimon <linimon at lonesome.com>
Cc: freebsd-gnats-submit at FreeBSD.org, freebsd-ports-bugs at FreeBSD.org
Subject: Re: ports/77707: Fix for ports/77403 introduced circular dependency
 in ports tree
Date: Sat, 19 Feb 2005 05:12:56 +0100

 > So we've overloaded the meaning of the variable.  At least this is
 > what I recall.
 
 I see. It doesn't seem to have been announced anywhere big time, so 
 missed that information. Sorry.
 
 While lang/gcc32 will build just fine without USE_GCC, the compiler used 
 in this case (cc) will complain a lot about GCC extensions being used. 
 So that's not a good idea. It seems to me that the following might be a 
 proper fix:
 
 bsd.gcc.mk should try to satisfy the USE_GCC with the system compiler 
 first and only if that does not match the version requested, it should 
 try port versions. This way, USE_GCC= 2.7+ would take on the same 
 meaning as the old USE_GCC= X in that it simply requests for system GCC 
 to be used. At the same time, things such as USE_GCC= 3.1 would continue 
 to work because if the system compiler isn't 3.1, bsd.gcc.mk would keep 
 looking for an acceptable GCC.
 
 - Bartosz