[cfe-dev] Using Clang 5.0.0 RC2 with MSVC dev builds

[Nico Weber via cfe-dev]

On Thu, Aug 17, 2017 at 12:24 PM, Zachary Turner via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> I believe at one point we discussed internally the idea of just having
> some command line flags that allow you to override the location of your
> bin, lib, and include directories.  The idea being to support hermetic
> toolchains (which is essentially what you've got).  Then we could still
> have all of this excessive validation to verify that it's a visual studio
> "installation", but if you've got something weird you can still just
> override it with options.
>

For %include%, we have -imsvc. Clang doesn't need to know about bin and lib
(?)


>
> Reid, thoughts?
>
> On Wed, Aug 16, 2017 at 8:16 PM Stephan T. Lavavej via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> [don hinton]
>> > Don't these scripts set a bunch of environment variables, e.g., PATH,
>> TMP, INCLUDE, LIB, and LIBPATH as well as LINK?
>>
>> They set PATH, INCLUDE, LIB, and LIBPATH (that's one for some #using
>> metadata thing). TMP is unaffected. LINK is not set. (I am not an expert
>> here, but I just checked an actual VS 2017 prompt.)
>>
>> You may be thinking about the CL, _CL_, LINK, and _LINK_ environment
>> variables which can be set by the user in order to inject compiler/linker
>> options.
>>
>> > If clang were to honor these variables instead of trying to reconstruct
>> them on the fly based on some root,
>> > be it VCINSTALLDIR or based on finding cl.exe in the PATH, you could
>> set them to whatever you want/need.
>>
>> That sounds right to me. (INCLUDE and LIB seem to be honored already.)
>>
>> STL
>>
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>
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