From:	Endlisnis <s257m AT unb DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: How can I tell if it's a bug from DJGPP or GCC?
Date:	Mon, 28 Sep 1998 19:03:58 -0300
Organization:	BrunNet
Lines:	61
Message-ID:	<361007CD.9A07A71D@unb.ca>
References:	<6u7smk$9t7$1 AT nnrp1 DOT dejanews DOT com>
NNTP-Posting-Host:	usr4fton18.brunnet.net
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

D DOT J DOT Eleveld AT anest DOT azg DOT nl wrote:

> class singelton
> {
>  private:
>    singelton() { };
>    ~singelton() { };
>
>  public:
>    static singelton instance;
> };
>
> singelton singelton::instance;

    That variable is instanced globally, so the destruction has to happen
globally.

> #include <stdio.h>
>
> enum index { zero = 0,
>              one,
>              two,
>              three,
>              four
>            };
>
> index GetVariable()
> {
>   return zero;
> }
>
> /* This assignment seems to be being skipped */
> const index problem = GetVariable();
>
> void Test(index event)
> {
>   switch(event)
>   {
>     /* Error occurs here */
>     case problem:
>       break;
>     default:
>   }
>
> }
> bug2.cc:25: case label `problem' does not reduce to an integer constant

    The value of 'problem' cannot be evaluated at compile time.  I does not look
at your code to find out that the function is a simple assignment, because it
might not.  It might be an infinite loop, how long is the compiler supposed to
try to figure out what the value will be?  4 seconds... 10 seconds... 100
seconds...  The reason why this doesn't work, is because there is no way of 100%
gaurenteeing the value of a function (it might pick a random value out of
memory).
--
     (\/) Endlisnis (\/)
          s257m AT unb DOT ca
          Endlisnis AT GeoCities DOT com
          Endlisnis AT BrunNet DOT Net

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