[cfe-dev] '-fsave-optimization-record' and VS2015 built compiler

[ORiordan, Martin via cfe-dev]

Hi Hal,

I am still using the LLVM v4.0 sources, haven’t yet had a chance to do the “Big Bang” update to v5.0, but hope to get to that soon.

I’ve check out these patches and see if they fix the problem before I consider filing a bug.  Curiously enough, on Linux the file is named ‘<basename>.opt.yaml’ in the current directory, but on Windows it gets the name ‘<TMP>\<basename>-######.opt.yaml’, so it appears that on Linux it is written directly to the intended final file, while on Windows it gets an intermediate temporary file name.

Thanks very much for your insight and help,

            MartinO

From: Hal Finkel [mailto:hfinkel at anl.gov]
Sent: Thursday, September 7, 2017 4:54 PM
To: ORiordan, Martin <martin.oriordan at intel.com>; Clang Dev <cfe-dev at lists.llvm.org>
Subject: Re: [cfe-dev] '-fsave-optimization-record' and VS2015 built compiler


Hi again,

What version of the compiler are you using? I'm wondering if this was fixed by r311041+r311043.

 -Hal
On 09/07/2017 09:57 AM, ORiordan, Martin via cfe-dev wrote:
Hi CFE-Devs,

I had posted the following question on LLVM-Dev but it seems more appropriate to CFE-Dev.  It appears that the temporary YAML file is being left in the TMP directory and not promoted to its final intended location.

Thanks,

            MartinO

-------------
Thanks Hal,

Though the option is handled in the driver, I was not sure if this was an LLVM implemented feature or a CLang implemented feature, and I know the list does not like cross-posting a message ;-)

And thanks too Brian:

From: Brian Cain [mailto:brian.cain at gmail.com]
That's pretty odd.  Can you rule out for sure that the files aren't being written somewhere unexpected or that the other clang was built against different sources?

Yes you’re right, it appears to be in ‘c:\tmp\foo-XXXXXX.opt.yaml’, though on Linux it is located in ‘./foo.opt.yaml’.  The sources for my Linux and VS2015 builds are identical.

So it would appear that the temporary files is being created but not finalised – probably a CLang driver issue.  I’ll dig deeper and see where this is going wrong and I’ll re-post this to CFE-Dev.

Thanks again to both of you,

            MartinO

From: Hal Finkel [mailto:hfinkel at anl.gov]
Sent: Thursday, September 7, 2017 3:37 PM
To: ORiordan, Martin <martin.oriordan at intel.com<mailto:martin.oriordan at intel.com>>; llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Subject: Re: [llvm-dev] '-fsave-optimization-record' and VS2015 built compiler

On 09/07/2017 09:10 AM, ORiordan, Martin via llvm-dev wrote:
Not 100% if this is an LLVM question or a CLang question, though I expect LLVM.

On Linux, if I pass ‘-fsave-optimization-record’ to ‘clang’, then it produces a ‘*.opt.yaml’ file.  However, the same thing run on Windows using ‘clang’ built with VS2015 silently ignores this option.

Is this a bug or is it intentional?  And if it is intentional, how can I configure and build on Windows to enable this feature?

Sounds like a bug (I've never tested on Windows). I suggest filing a bug report. Also, in general, you'll have better luck with frontend questions on cfe-dev.

 -Hal


Thanks,

            MartinO


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