Add support for clang-cl and llvm-undname

[tru]

This PR adds support for clang-cl and llvm-undname.

This makes it possible to cross-compile from linux to windows with clang-cl and make it behave like msvc.

There is also a bugfix that fixes the parsing of .cv_file.

Here is an example configuration for cross-compiling with clang-cl:

group.clangcl.compilers=clangcl
group.clangcl.groupName=clang-cl win64
group.clangcl.instructionSet=amd64
group.clangcl.compilerType=clang-cl
group.clangcl.options=/winsdkversion 10.0.22000.0 /winsysroot /path/to/sysroot
group.clangcl.demangler=/usr/local/bin/llvm-undname
group.clangcl.demanglerType=win32-llvm
group.clangcl.supportsBinary=false

[RubenRBS]

Thanks!

[RubenRBS]

Copyright header date is outdate

[tru]

oh funny - I just copied from clang.ts I think, didn't even reflect on the year :)

[RubenRBS]

Same here

[partouf]

re cdecl: I was wondering if maybe fastcall would be the default, but that's not the case https://learn.microsoft.com/en-us/cpp/cpp/cdecl?view=msvc-170 - so removing cdecl should be ok

[partouf]

the undname seems potentially quite intensive with a call for each mangled name

it might be better to use the stdin option as suggested here? https://github.com/microsoft/checkedc-llvm/blob/master/tools/llvm-undname/llvm-undname.cpp#L59

[partouf]

You can set stdin by setting execOptions.stdin = 'string...';

[tru]

Thanks for the suggestion - it worked fine when I figured out that the execOption variable is input not stdin :)

[tru]

Any additional feedback on this one?

[RubenRBS]

Only one minor nitpick request, but other than that, it looks great! Thanks!

[RubenRBS]

I'd love to have a test that ensures this works as expected so future changes to this can be made with some level of confidence :)

[RubenRBS]

WOuld love to have the tests for the demanging at some point, but it's not a blocker. Merging now, thanks for your patience in this :)

[jeremy-rifkin]

This is now live