[macstl-dev] gcc 3.4.2 "keywords" bool and pixel

[Michael LeBlanc]

Release 3.4.2 replaced one sort of silliness with others.  If you 
include <altivec.h>, you get by some magic macros for these words:

	#define __pixel  __attribute__((altivec(pixel__))) unsigned short
	#define __bool   __attribute__((altivec(bool__))) unsigned
	#define __vector __attribute__((altivec(vector__)))
	#define pixel  __pixel
	#define bool   __bool
	#define vector __vector

Without the include, all 6 words stand for themselves, and bool is a 
builtin type.  I wrote a little program to display some of this stuff 
and got a big surprise.  See the line below marked with "What!!!"

Aside from this weirdness, MacSTL looks like it will be a lot cleaner 
with this release and beyond.  But, vec <pixel, 8> fails to instantiate 
and I have not yet come up a specialization that will compile.

/usr/gcc-3.4.2/bin/c++ -O -I/home/leblanc/macstl/macstl p.cpp -o mike 
-DMIKE
p.cpp:10: warning: `altivec' attribute ignored
./mike


with <altivec.h>
    sizeof(pixel) = 2
   #define  pixel = __attribute__((altivec(pixel__))) unsigned short
   #define vector = __attribute__((altivec(vector__)))
     sizeof(bool) = 16   What!!!
   #define   bool = __attribute__((altivec(bool__))) unsigned

/usr/gcc-3.4.2/bin/c++ -O -I/home/leblanc/macstl/macstl p.cpp -o mike
./mike


without <altivec.h>
     sizeof(bool) = 1
   #define   bool = bool

Here's the program ...

$ cat p.cpp
#define STR2(x) #x
#define STR(x) STR2(x)

#include <stdio.h>

#ifdef MIKE

#include <altivec.h>

pixel ppp;
char *sss = STR(pixel);

#endif

bool aaa;
char *bbb = STR(bool);

char *vvv = STR(vector);

int main ()
{
#ifdef MIKE
     printf ("\n\nwith <altivec.h>\n");
     printf ("   sizeof(pixel) = %d\n", sizeof(ppp));
     printf ("  #define  pixel = %s\n", sss);
     printf ("  #define vector = %s\n", vvv);
#else
     printf ("\n\nwithout <altivec.h>\n");
#endif
     printf ("    sizeof(bool) = %d%s\n", 
sizeof(aaa),sizeof(aaa)>1?"\tWhat!!!":"");
     printf ("  #define   bool = %s\n\n", bbb);
     return 0;
}