[LLVMdev] recursing llvm

[Eric Christopher]

On Jun 27, 2012, at 10:48 PM, Reed Kotler <rkotler at mips.com> wrote:

> On 06/27/2012 05:00 PM, Eric Christopher wrote:
>> On Jun 19, 2012, at 5:24 PM, reed kotler<rkotler at mips.com>  wrote:
>> 
>>> Do the llvm nightly scripts "recurse" the compiler or just test that it
>>> can self host itself?
>>> 
>> No idea what you mean here. Can you explain?
>> 
>> -eric
> recursing a compiler means this.
> 
> clang/llvm source == src
> 
> compile src using clang/llvm (which may have been built using gcc) -> clang/llvm'   (prime)
> 
> compile src using clang/llvm' -> clang/llvm''
> 
> verify that the binaries for clang/llvm' == binaries for clang/llvm''
> 
> A compiler can be self hosted (made using itself) by just producing clang/llvm'
> 
> That is not as strong a test as recursing the compiler, even though you might run the full
> test suite using clang/llvm"

So... what I said? This is usually called a "bootstrap" of the compiler with "verification".

-eric