[MacPorts] #16549: gcc43: patch to add Ada support

[MacPorts]

#16549: gcc43: patch to add Ada support
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  Reporter:  martin.osx at krischik.com  |       Owner:  mww at macports.org 
      Type:  enhancement              |      Status:  new              
  Priority:  Normal                   |   Milestone:  Port Enhancements
 Component:  ports                    |     Version:  1.6.0            
Resolution:                           |    Keywords:                   
      Port:  gcc43                    |  
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Comment(by martin.osx at krischik.com):

 Replying to [comment:5 ryandesign@…]:

 > You should attach patches, not full Portfiles, so we can see what you
 changed.

 Ok!

 > I don't like the +ada variant because it causes the entire port to be
 built using MacPorts' gcc 4.3 instead of with Apple's gcc 4.0.
 > I don't like the +macada variant because it uses things that were not
 installed by MacPorts, which is against MacPorts policy. And it causes the
 entire port to be built using the external gcc 4.3 in /usr/local/ada-4.3.
 > If a port needs a bootstrap program, the port should download and
 internally use that bootstrap program. It should not rely on other
 software to be installed externally, and it really should not rely on an
 earlier version of itself having been installed.

 But this is how a [http://en.wikipedia.org/wiki/Self-hosting self hosted]
 system works. It uses an older version of a system to create the newer
 version. In the GCC tool chain the C and Ada compiler are self hosted.
 C++, Fortran and Java are not. And as such: for the C compiler you are
 already doing what you condemn: You use the externally provided Apple GCC
 4.0 to create MacPorts GCC 4.3. If Apple would not have provided you with
 ready made GCC C compiler you could not create a new one. And it is the
 same for the Ada compiler: If MacPorts would not have provided and initial
 Ada compiler for Mac OS X we would not be able to create a new version
 either.

 To create the initial compiler of a self hosted system you need to create
 a [http://en.wikipedia.org/wiki/Cross_compiler cross compiler] on a system
 where the tool chain already exists. A no go for MacPorts.

-- 
Ticket URL: <http://trac.macports.org/ticket/16549#comment:7>
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