From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 border2.nntp.dca1.giganews.com!nntp.giganews.com!news.glorb.com!news.swapon.de!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: -fdump-ada-spec
Date: Mon, 06 Oct 2014 18:45:12 +0100
Organization: A noiseless patient Spider
Message-ID: <ly61fxay8n.fsf@pushface.org>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx05.eternal-september.org;
 posting-host="865ecc8333c04b7dc8d5f87fc772110b";
 logging-data="11549"; mail-complaints-to="abuse@eternal-september.org";
 posting-account="U2FsdGVkX1+s8nuB5TGOsrNsskKyT3v0sp4kM36gcXo="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (darwin)
Cancel-Lock: sha1:S3FEc4BqW6hDHZqZ0tJ6WAe84J8=
 sha1:rfcTOUQ8nMwT4PjvvC29eRvdVDY=
Xref: number.nntp.giganews.com comp.lang.ada:189453
Date: 2014-10-06T18:45:12+01:00
List-Id: <comp.lang.ada>

Does anyone know where this is implemented in the GCC sources?

I'm having trouble with some of the system headers: on Mac OS X, with
all the GNATs and GCCs I have, dumping /usr/include/wchar.h uses
'limited with' in a way that doesn't work, whereas on Debian (wheezy,
gcc-4.7) there's no 'limited with'. Of course, wchar.h is different!

I _think_ that -fdump-ada-spec sees that a particular type (eg FILE) is
always accessed via a pointer, and decides that 'limited with' is OK;
but for some reason this ends up being unacceptable.

The ARM (and AI95-0217) didn't help a lot here. I think the problem is
that the original code is like

   typedef struct Blah {
     int x;
   } FILE;

and the generated code is like

   package Stdio is

      type Blah is record
         X : Integer;
      end record;

      subtype FILE is Blah;

   end Stdio;

   limited with Stdio;
   package Wchar is

      procedure Foo (F : access Stdio.FILE);

   end Wchar;

and the 'limited with' magic only works for _types_, so you get the
error '"FILE" not declared in "Stdio"'.

Stdio.FILE should be declared as

      type FILE is new Blah;