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

[don hinton via cfe-dev]

I can't test this since I don't have windows, but I think the problem is
the additional directory checks in findVCToolChainViaEnvironment() which
don't match his path to cl.exe, i.e., S:\binaries\x86ret\bin\i386\cl.exe.



On Tue, Aug 15, 2017 at 9:43 AM, Zachary Turner via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Since we most likely cannot reproduce this without access to this same
> development environment, I think the easiest way to figure this out would
> be for Stephan to debug into clang itself.  It definitely sounds like a
> problem, but I think only you will be able to figure out exactly what it
> is.  Luckily it should be easy to figure out.  Set a breakpoint in the
> constructor of MSVCToolChain in clang/lib/Driver/ToolChains/MSVC.cpp and
> see what's going on in there.  Most likely it's the VCToolsInstallDir or
> VCINSTALLDIR as Reid mentioned.
>
> On Tue, Aug 15, 2017 at 9:30 AM Reid Kleckner <rnk at google.com> wrote:
>
>> On Mon, Aug 14, 2017 at 6:17 PM, Reid Kleckner <rnk at google.com> wrote:
>>
>>> > 2. Is there a simple way for me to get Clang 4.0's behavior back,
>>> where having cl.exe and link.exe on my PATH makes Clang automatically
>>> detect the correct -fms-compatibility-version and link.exe to be used?
>>>
>>> I haven't figured out what changed, but that definitely seems like a
>>> regression.
>>>
>>
>> As I read the current code, we search the environment, then we try the
>> new setup config API, and then we try the registry. That seems correct.
>>
>> I think the change from 4.0 to 5.0 was that when we look at the
>> environment, we now try these variables in order:
>> 1. VCToolsInstallDir: this is new
>> 2. VCINSTALLDIR: we always tried this before PATH
>> 3. PATH
>>
>> Are either of those first two variables set to point to 2013?
>>
>> Once clang finds cl.exe it calls GetFileVersionInfoW to work out the
>> version, which should work as intended.
>>
>
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