[LLVMdev] Byte code portability (was Re: libstdc++ as bytecode, and compiling C++ to C)

[Reid Spencer]

On Fri, 2006-11-24 at 21:13 +0100, Philipp Klaus Krause wrote:
> Reid Spencer schrieb:

> Hmm the problem was a bit different. I just reproduced it.
> 
> I used this input file:
> 
> #include <stdint.h>
> 
> uint32_t test(uint32_t t)
> {
> 	return(t + 42);
> }
> 
> and got the following code:
> 
> unsigned test(unsigned ltmp_0_1) {
>   return (ltmp_0_1 + 42u);
> }
> 
> unsigned is 16 bit on my target platform.

Sure, but what is it on the target that llvm-gcc is configured for? If
you're running llvm-gcc on a 32-bit platform without configuring it as a
cross-compiler then the above is correct. 32-bit unsigned is what is
expected on the target you're compiling for. This is exactly why its
important to configure llvm-gcc as a cross-compiler for your target. If
you do, I'm sure that you'll find it will generate:

unsigned long test (unsigned long ltmp_0_1) {
  return (ltmp_0_1 + 42ul);
}

assuming that "unsigned long" is a 32-bit unsigned long on your target.

Reid.

> 
> Philipp
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