[LLVMdev] warnings in inline assembly with used labels and -Wunused-label

[Dale Johannesen]

This is fixed in TOT  (rev 107051 for C, 108732 for C++)

On Jul 23, 2010, at 2:20 AMPDT, Alexandre Colucci wrote:

> Hi,
>
> llvm-gcc 4.2 generates warnings when I compile inline assembly code  
> that contains used labels with -Wunused-label. The generated code  
> seems to work yet. gcc 4.2 doesn't generate those warnings. I  
> haven't found any bugs regarding this issue in the llvm bug database.
>
> Does anyone know if this is a known llvm issue? Is it a warning that  
> I can ignore and does not affect the generated code? Is there a  
> workaround to avoid these warnings (without turning off -Wunused- 
> label)?
>
>
> Here is a small sample code that exhibits the issue:
>
> int main()
> {
> __asm__
> 	{
> MyLabel:
> 		sub	ebx,8
> 		jg MyLabel
> 	}
> 	
> 	return 0;
> }
>
>
> Compile with llvm-gcc 4.2 on MacOSX 10.6:
>
> llvm-gcc-4.2 -arch i386 -Wunused-label -fasm-blocks -o  
> inlineassembly_llvm inlineassembly.c
> inlineassembly.c: In function ‘main’:
> inlineassembly.c:7: warning: label ‘LASM$MyLabel’ defined but not used
>
> Compile with gcc 4.2 on MacOSX 10.6:
>
> gcc -arch i386 -Wunused-label -fasm-blocks -o inlineassembly  
> inlineassembly.c
> no warnings
>
>
> Thanks,
> Alexandre
>
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