llvm dev - Oct 2019 - Building For x64 Windows using LLVM

I'm trying to do it by passing "-Xclang -m64" on the VS2019
command line options panel but it gives the error "unknown argument"
on "-m64".  How do I do it?  Thanks in advance.
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It should work if you remove -Xclang. clang-cl will recognize -m64.

The clang -cc1 interface that clang-cl delegates to doesn't recognize -m64.
It's implemented purely in the driver above the -cc1 invocation.

On Thu, Oct 10, 2019 at 7:48 AM Osman Zakir via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I'm trying to do it by passing "-Xclang -m64" on the VS2019
command line
> options panel but it gives the error "unknown argument" on
"-m64".  How do
> I do it?  Thanks in advance.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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clang-cl recognizes -mllvm, so it shouldn't need escaping.

And in general, if you find that clang-cl does not recognize a flag, I
recommend prefixing it with -clang:, which causes clang to treat it as a
GCC-style option in the driver instead of escaping it. The short version
is, use /clang:-fblah instead of -Xclang -fblah if possible.

On Thu, Oct 10, 2019 at 1:34 PM Osman Zakir <osmanzakir90 at hotmail.com>
wrote:
> Thanks for the reply.  Is "-Xclang -mllvm" fine, or should I
remove the
> "-Xclang" from here as well?
>
>
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Okay, so I can use -std:c++17 with clang-cl.exe?  I guess it was adopted from
/std:c++17 which the regular cl.exe uses.
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You can typically copy and paste a cl command line and it will work, and
clang-cl accepts dashes or slashes, so yes

On Thu, Oct 10, 2019 at 3:16 PM Osman Zakir via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Okay, so I can use -std:c++17 with clang-cl.exe?  I guess it was adopted
> from /std:c++17 which the regular cl.exe uses.
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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