[LLVMdev] TargetParser - Always build all table-gen files?

Mehdi Amini mehdi.amini at apple.com
Tue Mar 10 09:20:27 PDT 2015

> On Mar 10, 2015, at 4:18 AM, Renato Golin <renato.golin at linaro.org> wrote:
> On 9 March 2015 at 17:40, Renato Golin <renato.golin at linaro.org> wrote:
>> The only way I can think of solving this is to change how tablegen()
>> handles the file name, with some "if(IS_ABSOLUTE)", but looking
>> further, the file name is used to more than just a filename, and gets
>> included in some variables names, etc. Also, I can't add another
>> option to the end of tablegen() because, AFAICS, this function is
>> variadic, with all table-gen options following the file name...
> CMake turned out a lot more powerful than I was imagining, and the
> change was really simple.
> Let's follow it here:
> http://reviews.llvm.org/D8195
> The biggest question now is: do we have a consensus that building all
> table-gen files is worth the massive de-duplication of current code
> and future work that will follow?

I’d like to avoid as much as possible adding compilation time to the process unless it is necessary (I’m not saying it does not worth it here).
It is not clear to me why do you need to generate *all* the table-gen files and not only the one related to target features? 



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