[cfe-dev] changing -save-temps to keep bitcode?

Reid Kleckner rnk at google.com
Thu Dec 18 15:10:08 PST 2014


I had to revert this patch in r224546, as it broke compilation of fortran
files with gcc through the clang driver. It's easy to observe the change in
behavior with -###, but I think you need to be on a system where clang
thinks there is a valid gcc installation that can handle fortran. I was
unable to observe the behavior change on Windows, for example, so I doubt
it will be observable on Mac OS X without some fiddling. Let me know if you
need help reproducing the situation.

On Mon, Dec 15, 2014 at 4:19 PM, Bob Wilson <bob.wilson at apple.com> wrote:
>
>
> On Dec 15, 2014, at 3:06 PM, David Blaikie <dblaikie at gmail.com> wrote:
>
>
>
> On Mon, Dec 15, 2014 at 3:00 PM, Diego Novillo <dnovillo at google.com>
> wrote:
>>
>>
>> On Dec 15, 2014 5:23 PM, "David Blaikie" <dblaikie at gmail.com> wrote:
>> >
>> >
>> >
>> > On Mon, Dec 15, 2014 at 1:09 PM, Diego Novillo <dnovillo at google.com>
>> wrote:
>> >>
>> >> On 12/15/14 15:10, Joerg Sonnenberger wrote:
>> >>>
>> >>> On Mon, Dec 15, 2014 at 11:26:43AM -0800, Bob Wilson wrote:
>> >>>>
>> >>>> Does anyone have interest in this or objections to it?
>> >>>
>> >>>
>> >>> Yes, please. Especially if it captures the bitcode *before* any of the
>> >>> optimisations hit.
>> >>
>> >>
>> >> Agreed. On several occasions, I've found myself wondering how I can
>> generate bitcode exactly as it leaves the parser, before any early cleanups
>> and such.
>> >
>> >
>> > -mllvm -disable-llvm-optzns
>> >
>> > will produce the IR straight out of Clang's CodeGen. Skipping things
>> like the AlwaysInliner and AddDiscriminator pass, etc.
>> >
>>
>> Yes. Of course, i know that.
>>
> Ah, sorry - wasn't sure if you knew that particular one. I always forget
> it/have to look it up whenever I want to do that.
>
>> The point is that easier is better.
>>
> Sure enough - well, point to Bob, then: consider doing this kind of IR,
> rather than the usual -emit-llvm IR, to get something closer to the
> original/pure generated IR.
>
>
> Sounds good. I agree that will be even more useful. Steven Wu has already
> written a patch to do something similar, so I’ll see if I get that done
> soon.
>
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