Hi Clemens,

I don't see any discussion in the bug  https://crbug.com/v8/9555 about the 
support for MSVC.
Is there a place, where we can vote or explain our use case for not 
breaking the usage of v8 from MSVC?

Best regards,
 Dimitar

On Monday, July 29, 2019 at 1:43:30 PM UTC+3, Clemens Backes wrote:
>
> Note: This is being tracked as https://crbug.com/v8/9555 now. I am just 
> landing a fix for this <https://crrev.com/c/1720669>, and on the bug we 
> are discussing whether we care enough about MSVC debug to add a bot to the 
> waterfall.
>
> On Mon, Jul 29, 2019 at 12:36 PM Jakob Kummerow <[email protected] 
> <javascript:>> wrote:
>
>> if someone has the magic args.gn needed, I'd appreciate it.
>>
>>
>> For the record, you can easily get any build bot's args.gn: click 
>> through to a specific build (in this case, e.g. 
>> https://ci.chromium.org/p/v8/builders/try/v8_win64_msvc_compile_rel/b8906608002392908144),
>>  
>> and in the "Steps and Logs" section, look for "gn_args".
>>
>> Is this still supported?
>>
>>
>> I'm not sure what the official policy is at the moment. I think at the 
>> very least, we would happily accept patches that maintain the MSVC build. 
>> As you have figured out, we have Release-mode buildbot coverage for it; I 
>> guess we assume that MSVC Debug builds are used and/or break rarely enough 
>> that spending bot resources on them is hard to justify.
>>
>>
>> On Fri, Jul 26, 2019 at 1:05 AM billti via v8-dev <
>> [email protected] <javascript:>> wrote:
>>
>>> A colleague tracked it down to the CSA_ASSERT macro in 
>>> code-stub-assembler.h failing in debug builds (looks like the tryjob only 
>>> builds rel for MSVC).
>>>
>>> This change 16 days ago seems to have broken it: 
>>> https://chromium-review.googlesource.com/c/v8/v8/+/1693002 . If I check 
>>> out the parent commit (0fd3766) I can build debug fine in MSVC (after one 
>>> more trivial MSVC fix in a DCHECK in wasm-module-builder.cc). It still 
>>> gives the "/Zc:twoPhase" compiler option warning, but hopefully that's 
>>> benign.
>>>
>>> I'll log a bug.
>>>
>>> On Thursday, July 25, 2019 at 3:38:20 PM UTC-7, [email protected] 
>>> wrote:
>>>>
>>>> Is this still supported?
>>>>
>>>> Trying to build the tip of master with 'is_clang = false' in args.gn 
>>>> (and various other attempted options) is giving lots of different warnings 
>>>> and failures, e.g.
>>>>
>>>>
>>>> cl : Command line warning D9002 : ignoring unknown option '/Zc:twoPhase'
>>>> .etc.
>>>> [501/1829] CXX 
>>>> obj/torque_generated_initializers/proxy-set-property-tq-csa.obj 
>>>> FAILED: obj/torque_generated_initializers/proxy-set-property-tq-csa.obj
>>>> .etc.
>>>> C:\src\v8\v8\src/codegen/code-stub-assembler.h(493): error C2059: 
>>>> syntax error: ','
>>>> .etc.
>>>> C:\src\v8\v8\src/objects/tagged-impl-inl.h(18): fatal error C1003: 
>>>> error count exceeds 100; stopping compilation
>>>> .etc.
>>>>
>>>> It's the first time I've tried with MSVC, so may be doing something 
>>>> wrong. (I have no issues with the default clang-based builds on the same 
>>>> machine).
>>>>
>>>> I can see from task manager and the log output it is using the right 
>>>> MSVC compiler (I tried with VS 2017 and VS 2019 installs), e.g.
>>>>
>>>> > ninja -t msvc -e environment.x64 -- "C:\Program Files (x86)\Microsoft 
>>>> Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.22.27905\...
>>>>
>>>> I see some of the V8 tryjobs build with MSVC (e.g. 
>>>> https://ci.chromium.org/p/v8/builders/try/v8_win64_msvc_compile_rel) 
>>>> and seem to be working, so if someone has the magic args.gn needed, 
>>>> I'd appreciate it.
>>>>
>>>> Thanks,
>>>>
>>>>  - Bill
>>>>
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>
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> Clemens Hammacher
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