LongestReal problems - Gpc

11 Jul 1998


      From: Marius Gedminas mgedmin@pub.osf.lt
To: gpc@hut.fi
Cc:
Bcc:
Subject: LongestReal problems
Reply-To:
Hi, developers!
DJGPP version of GPC-980511 complains when I try to use ArcTan function on
LongestReals (in fact is is `ld', not `gpc', which complains). The error
message is as follows:
c:/djgpp/lib/gcc-lib/djgpp/2.81/libgpc.a(pp_ARCTAN.o)(.text+0xd):rts-emath.c: undefined reference to `tanl'
c:/djgpp/lib/gcc-lib/djgpp/2.81/libgpc.a(pp_ARCTAN.o)(.text+0x29):rts-emath.c: undefined reference to `tanl'
Another (unrelated) problem: let's say we have a source like this:
program StrangeLongReals;
{ This compiles both under GPC and Borland Pascal }
{$IFNDEF __GPC__} {$N+,E+} {$ENDIF}
var
  R: {$IFDEF __GPC} LongestReal {$ELSE} Extended {$ENDIF};
begin
  R := 0.123451234512345;
  WriteLn(R);                       {--- Correct }
  WriteLn(R:0:70);                  {--- Prints lots of random digits }
  R := 0.1234512345123451234512345;
  WriteLn(R);                       {--- Correct }
  WriteLn(R:0:70);                  {--- Prints lots of random digits }
end.
When compiled with Borland Pascal I get the following output:
 1.23451234512345E-0001
0.123451234512345000
 1.23451234512345E-0001
0.123451234512345123
And GPC version gives:
 1.234512345123450e-01
0.1234512345123449999978669759571270816137668263830656896932817737042602
 1.234512345123451e-01
0.1234512345123451234478368405878757685782057823543386991840842994341343
I don't know if this is a bug or a feature, but I would prefer the behavior
of BP.
Yours,
--
Marius Gedminas                          "A Hacker is any person who derives
E-mail: mgedmin@pub.osf.lt                      joy from discovering ways to
WWW: http://www-public.osf.lt/~mgedmin/      circumvent limitations." rab'86