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

[Bob Wilson]

Do you have any details on how it broke? If I can see the symptom, I might be able to guess at the cause.

> On Dec 18, 2014, at 3:10 PM, Reid Kleckner <rnk at google.com> wrote:
> 
> 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 <mailto:bob.wilson at apple.com>> wrote:
> 
>> On Dec 15, 2014, at 3:06 PM, David Blaikie <dblaikie at gmail.com <mailto:dblaikie at gmail.com>> wrote:
>> 
>> 
>> 
>> On Mon, Dec 15, 2014 at 3:00 PM, Diego Novillo <dnovillo at google.com <mailto:dnovillo at google.com>> wrote:
>> 
>> On Dec 15, 2014 5:23 PM, "David Blaikie" <dblaikie at gmail.com <mailto:dblaikie at gmail.com>> wrote:
>> >
>> >
>> >
>> > On Mon, Dec 15, 2014 at 1:09 PM, Diego Novillo <dnovillo at google.com <mailto: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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