[cfe-dev] clang windows: clang-cl support for /MP

[Tilo Kühn]

i think so, if clang for windows offers MSVC integration (which is 
brilliant) it should support this /MP option as well.

>That was my initial feeling, but if we'd like to plug clang-cl into VS 
>then it should be able to handle this?
>
>On Wed, May 20, 2015 at 9:09 PM, Kim Gräsman <kim.grasman at gmail.com> 
>wrote:
>>There are two levels of parallellization in Visual Studio/Visual C++;
>>
>>1) Machine-wide setting of how many projects to build in parallel --
>>this informs Visual Studio/MSBuild
>>2) Compiler setting (/MP) of how many source files to compile in
>>parallel -- this actually informs CL.EXE and causes it to launch child
>>processes
>>
>>See Bruce Dawson's treatise for the gory details:
>>https://randomascii.wordpress.com/2014/03/22/make-vc-compiles-fast-through-parallel-compilation/
>>
>>Not sure how easy/desirable this behavior would be in clang-cl, but
>>from a principal standpoint I'd prefer this kind of thing in the build
>>system, not the compiler.
>>
>>- Kim
>>
>>
>>On Wed, May 20, 2015 at 12:12 PM, Nikola Smiljanic 
>><popizdeh at gmail.com> wrote:
>> > This is usually handled by the build system (make -j, ninja, etc.). 
>>I'd
>> > expect this flag to actually control MSBuild, not the driver, but 
>>it'd be
>> > interesting to find out how it really works.
>> >
>> > On Wed, May 20, 2015 at 6:01 PM, Tilo Kühn 
>><tilo.kuehn.73 at googlemail.com>
>> > wrote:
>> >>
>> >> are there any plans to support the /MP option (parallel compilation 
>>within
>> >> one project) in clang-cl?
>> >> at the moment clang for windows prints out a warning that the 
>>option is
>> >> not supported yet and it uses only one core while compiling a 
>>single
>> >> project.
>> >>
>> >> (if msvc is allowed to compile parallel independent projects it 
>>uses a
>> >> multiple cores.)
>> >>
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>> >
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>