gdb-patches RFA: Fix pascal behavior for class fields

For gpc mailing list:
this email comes as a follow-up of this bug report
https://sourceware.org/bugzilla/show_bug.cgi?id=17815

The start of the thread can be found at:
https://sourceware.org/ml/gdb-patches/2015-01/msg00164.html

Pedro asked:
> >> How about adding this to the test suite?
> >
> >
> >   The whole testsuite/gdb.pascal is almost empty,
> > I never invested time to develop it :(
> >
> >   At the time I started it, GPC (the GNU pascal compiler)
> > was still active, but development apparently
> > stopped since quite some time.
> >
> >   I am unable to install GPC, which means that I cannot test it.
> > Would a testsuite that supports only Free Pascal be acceptable?
> 
> Do you actually mean, whether it's ok for a new
> test (not test suite) to go in untested on GPC?  It certainly is.
> Better test on FPC than nowhere.  :-)
  That is indeed what I meant.
 
> AFAICS, the tests themselves don't really care which compiler
> is in use other than for marking xfails; you just call
> gdb_compile_pascal,
> and that works with either.  That's my impression from quickly
> skimming testsuite/lib/pascal.exp.

  The problem is that GPC and Free Pascal support several
pascal 'dialects'. But this requires command line options.

  The -Mobjfpc option is required for Free Pascal compiler
to understand class type definition, but is rejected in default mode.

  I expect GNU GPC to also reject class in 'normal' mode...
Maybe someone on the gpc mailing list knows if classes are supported
by GPC and if it requires a special compiler option.

Pierre Muller

FYI: Here is the example code that is included in the bug report.

$ cat ~/pas/test/test-class-pascal.pas

type
  TA = class
  public
  x, y : integer;
  constructor Create;
  function check(b : TA) : boolean;
  destructor Done; virtual;
end;

constructor TA.Create;
begin
  x:=-1;
  y:=-1;
end;

destructor TA.Done;
begin
end;

function TA.check (b : TA) : boolean;
begin
  check:=(x < b.x);
end;



var
  a, b : TA;

begin
  a:=TA.Create;
  b:=TA.Create;
  a.x := 67;
  a.y := 33;
  a.check (b);
end.