Re: [Plib-devel] Compiling problems in SGI Irix 6.5.7

[Steve B. <sjb...@ai...>]

Wein Gui wrote:
> 
> Hi, friends,
> 
> I am trying my first compilation of Plib for FlightGear, and use SGI
> Octane machine's 7.3 C++ compiler in IRIX 6.5.7.
> 
> I have installed all the needed libraries without any problems and
> configure is happy. But now when I tried to "make", it stops on an
> error:

> cc-1020 CC: ERROR File = sgIsect.cxx, Line = 29
>   The identifier "FLT_EPSILON" is undefined.
> 
>     if ( dnorm < FLT_EPSILON )
>                  ^

This has obviously been a problem before - because in sg.cxx (where
FLT_EPSILON has also been used), it says:

  #ifndef FLT_EPSILON
  #define FLT_EPSILON 1.19209290e-07f        
  #endif

...I should probably copy those three lines into the top of
sgIsect.cxx

> cc-1133 CC: ERROR File = ssgSimpleState.cxx, Line = 18
>   Expression must be a modifiable lvalue.
> 
>     specular_colour = src -> specular_colour ;
>     ^
> 
> cc-1133 CC: ERROR File = ssgSimpleState.cxx, Line = 19
>   Expression must be a modifiable lvalue.

These are actually fixed in the latest CVS version - I havn't had
the time to make a proper release out of it though.

Change those four lines to:

  sgCopyVec4 ( specular_colour, src -> specular_colour ) ;
  sgCopyVec4 ( emission_colour, src -> emission_colour ) ;
  sgCopyVec4 (  ambient_colour, src ->  ambient_colour ) ;
  sgCopyVec4 (  diffuse_colour, src ->  diffuse_colour ) ;                      

...and all will be well.

--
Steve Baker                  http://web2.airmail.net/sjbaker1
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