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Atari coding BBS
| VBCC strange 16bits/32bits val |
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Posted by: Orion_
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Mar,01.2010-16:42
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I'm trying to setup VBCC as a dev environment for compiling my programs both from my PC or my Falcon under
TOS.
It was working nice until I got strange behaviors.
For example with this little piece of code:
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 240
void SomeFunction(void)
{
unsigned long i;
for (i = 0; i < SCREEN_WIDTH * SCREEN_HEIGHT; i++)
{
// do stuff...
}
}
When looking at the assembly code generated by the compiler, it was doing something like that:
cmp.l #11264,d0
where it should be:
cmp.l #76800,d0
So I guess the value computed by the preprocessor was "cropped" to 16bits
I was using the m68ks version of the compiler, so I tried the m68k version and then it was computing the good
value (76800).
But ! All the call to libc (lvc) I made didn't worked anymore.
for example printf of a number always printed "0".
I tried both libvc and libvcs.
I also tried using osbind instead of libvc, but when using the m68k version of the compiler, all the values
pushed on stack were .l !
I had to rewrite all the gemdos/xbios call in assembly to get it right. :/
I'm missing something in the configuration file or in the use of VBCC ?
Did someone had the same behavior using VBCC ?
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