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

[Alexandre Colucci]

Thanks a lot. I should have tried ToT.

Alexandre


> 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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> 
>