[cfe-dev] Clang on Windows targteing gcc compiles very slowly

[Nikola Smiljanic]

I was about to suggest the same, you can add /Bt+ to msvc to print out
compile times for individual files. Find the slowest one and try it with
clang (I guess you can use PowerShell
http://superuser.com/questions/228056/windows-equivalent-to-unix-time-command
).

On Wed, Jun 3, 2015 at 6:50 AM, Sean Silva <chisophugis at gmail.com> wrote:

>
>
> On Mon, Jun 1, 2015 at 9:27 AM, Dennis Luehring <dl.soluz at gmx.net> wrote:
>
>> i only compared Microsoft CL with cl-clang (from http://llvm.org/builds/
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_builds_&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=CnzuN65ENJ1H9py9XLiRvC_UQz6u3oG6GUNn7_wosSM&m=F0-TlLu8wZj-QcYcLWTpmo251k1w1lbeo5uj1fjNZAY&s=ItGDeRxbJmbIQjxkgyIWRU9bq4xH9Rto6dcnFcaQxS4&e=>
>> )
>> and cl-clang is ~2 Times slower in build
>>
>> there is no small example available - my project is closed and my open
>> source dependecy Xerces 3.1.2
>> is not compilable, other open souce projects mentioned (last posts) are
>> not buildable with cl-clang
>>
>
> Can you maybe try compiling a couple files of the open source project in
> isolation to see if you can narrow things down to a single representative
> file?
>
> -- Sean Silva
>
>
>>
>> you need a VStudio Project with a least 1-2 minutes build-time - then
>> switch to
>> cl-clang and compare the build-time
>>
>>
>>
>> Am 01.06.2015 um 18:15 schrieb Yaron Keren:
>>
>>> I wouldn't expect clang-cl (targeting VC) build time to be different than
>>> clang (targeting mingw), so the difference is probably not clang on
>>> WIndows
>>> specifically but rather clang in general.
>>> Could you send a small example outlining the difference?
>>>
>>>
>>>
>>> 2015-06-01 18:54 GMT+03:00 Dennis Luehring <dl.soluz at gmx.net>:
>>>
>>> > i've got the same compilation difference between cl and cl-clang using
>>> the
>>> > http://llvm.org/builds/
>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_builds_&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=CnzuN65ENJ1H9py9XLiRvC_UQz6u3oG6GUNn7_wosSM&m=F0-TlLu8wZj-QcYcLWTpmo251k1w1lbeo5uj1fjNZAY&s=ItGDeRxbJmbIQjxkgyIWRU9bq4xH9Rto6dcnFcaQxS4&e=>
>>> >
>>> > is there an official cl/cl-clang testprojects collection or how is the
>>> > testing done?
>>> >
>>> >
>>> > Am 01.06.2015 um 17:47 schrieb Yaron Keren:
>>> >
>>> >> >How and with what ?
>>> >>
>>> >> Comparing the compilation time between snapshot binary and the
>>> version you
>>> >> built locally will pinpoint if the problem is in clang in general or
>>> some
>>> >> local configuration.
>>> >>
>>> >>
>>> >>
>>> >> 2015-06-01 18:06 GMT+03:00 Edward Diener <
>>> eldlistmailingz at tropicsoft.com
>>> >> >:
>>> >>
>>> >> > On 6/1/2015 12:24 AM, Yaron Keren wrote:
>>> >> >
>>> >> >> Edward, could you time the snapshot binaries from
>>> >> >> http://llvm.org/builds/
>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_builds_&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=CnzuN65ENJ1H9py9XLiRvC_UQz6u3oG6GUNn7_wosSM&m=F0-TlLu8wZj-QcYcLWTpmo251k1w1lbeo5uj1fjNZAY&s=ItGDeRxbJmbIQjxkgyIWRU9bq4xH9Rto6dcnFcaQxS4&e=>
>>> >> >>
>>> >> >
>>> >> > How and with what ?
>>> >> >
>>> >> >
>>> >> >
>>> >> >
>>> >> > _______________________________________________
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>>> >>
>>> >>
>>> >>
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