Re: [Jack-Devel] [LAU] jack2 turned verbose

On 06/01/2012 11:33 PM, Fons Adriaensen wrote:
> On Sat, Jun 02, 2012 at 12:04:52AM +0300, Nedko Arnaudov wrote:
>  
>> The default value of "verbose" is set to 10, the default value of
>> "realtime-priority". libdbus has checks for boolean values that gets
>> triggered because 10 is neither true (1) not false (0).

I was under the impression that true is usually defined as -1 (not +1).
Using two's complement -1 would set all bits to on.
and "if (false)" := "branch if zero"

> How are these checks done ?
> 
> I tried this:
> 
> 
> int main (int ac, char *av [])
> {
>     int i;
> 
>     union
>     {
>         bool b;
>         int  i;
>     } X;
> 
>     puts ("");
>     for (i = 0; i < 5; i++)
>     {
>         X.i = i;
>         if (X.b) puts ("true");
>         else     puts ("false");
>     }
> 
>     puts ("");
>     for (i = 0; i < 5; i++)
>     {
>         X.i = i;
>         if      (X.b == true)   puts ("true");
>         else if (X.b == false)  puts ("false");
>         else                    puts ("Neither true or false");
>     }
> 
>     return 0;
> }

nice. That's indeed what the problem boils down to.

Well, depending what the compiler does, maybe add some explicit
type-casts:  X.b == false  vs.  ((bool) X.b) == false.
In POSIX-C 'false' is #define'd as 0

> which prints: 
> 
> false
> true
> true
> true
> true
> 
> false
> true
> true
> true
> true

Is this Arch-Linux, gcc/g++-4.7.0, with "-O2" ?
The flags to produce the problem with: g++ 4.7.0 are
CXXFLAGS="-march=i686 -mtune=generic -O2 -pipe -fstack-protector
--param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"

1338621426.3051_0.ltw:2,a <4FC9BDE9.4030206 at gareus dot org>