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Re: Great example of why "everything is a tree" sucks

On Wed, 13 Nov 2013, Gaius Mulley wrote:

> just for completeness this also applies to Modula-2 which uses the
> technique of double book keeping.  Not sure if this is totally relevant
> but gm2 needs (would like :-) the ability to create a SET_TYPE which
> maps onto appropriate debugging type info.

Note we removed SET_TYPE in 2004 for lack of in-tree uses (there was a 
suspicion it might have been for Pascal, but GNU Pascal is now a moribund 
project (largely I think because of the combination of (a) being closely 
tied to GCC internals through use of trees as front-end internal 
representation and (b) not being developed in the GCC repository but 
externally with attempts to support multiple GCC versions from one GNU 
Pascal version, meaning lots of effort needed outside the GCC community to 
update it to new GCC versions - also (c) there's another more actively 
developed GPL Pascal compiler, Free Pascal, albeit for different versions 
of the Pascal language).

In general, for GCC development to consider requirements of your front end 
or back end, getting it into the GCC repository and developing it there is 
strongly recommended.

Joseph S. Myers

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