[SDL] compiling SDL-1.2.12 with CFLAGS="-mcpu=G4" fails

[Ryan C. Gordon]

matt hull wrote:
> it compiles.  i was asking a few other people and they said its a gcc  
> problem.  do you know anything more on that ?

It's not a bug, really.

It's trying to use an altivec extension in one of the headers. It sees 
an #ifdef that suggests the target CPU definitely has Altivec support, 
and then includes some Altivec functionality.

The problem is GCC doesn't understand the Altivec extension keywords and 
assumes it's a syntax error, if you don't use -faltivec. It can't turn 
this option on by default with -mcpu=G4, because words like "vector" 
might be used in your legitimate C program that have nothing to do with 
Altivec.

So in this case, if you use one flag, use the other, too.

--ryan.