[llvm] r330742 - Let TableGen write output only if it changed, instead of doing so in cmake.

[Dean Michael Berris via llvm-commits]

+1 to this, either we fix this or can we revert?
On Tue, May 8, 2018 at 9:39 AM Chandler Carruth via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> On Fri, May 4, 2018 at 4:47 AM Tim Northover via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

>> Hi Nico,

>> On 24 April 2018 at 18:29, Nico Weber via llvm-commits
>> <llvm-commits at lists.llvm.org> wrote:
>> > Let TableGen write output only if it changed, instead of doing so in
cmake.

>> This change seems to force all TableGen steps to rerun even for an
>> incremental build with no changes. That's probably worse than the
>> status before. Do you think it's fixable?


> I think this has to be fixed.

> Running tablegen is *not fast* in many cases. Re-running it for every
target for every rebuild is really not acceptable.

> Nico, it's been over a week with no update. I'm going to revert this
until you have time to look into fixing this because myself and numerous
other people have been complaining about constant rebuilds due to this and
not know why this happens.



>> Cheers.

>> Tim.
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