[clang] [clang] Add support for SerenityOS (PR #187941)

[via cfe-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

The build failed before running any tests. Click on a failure below to see the details.

<details>
<summary>[code=1] tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Serenity.cpp.obj</summary>

```
FAILED: [code=1] tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ToolChains/Serenity.cpp.obj
sccache C:\clang\clang-msvc\bin\clang-cl.exe  /nologo -TP -DCLANG_BUILD_STATIC -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:\_work\llvm-project\llvm-project\build\tools\clang\lib\Driver -IC:\_work\llvm-project\llvm-project\clang\lib\Driver -IC:\_work\llvm-project\llvm-project\clang\include -IC:\_work\llvm-project\llvm-project\build\tools\clang\include -IC:\_work\llvm-project\llvm-project\build\include -IC:\_work\llvm-project\llvm-project\llvm\include /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported /Gw /O2 /Ob2  -std:c++17 -MD -UNDEBUG /EHs-c- /GR- /showIncludes /Fotools\clang\lib\Driver\CMakeFiles\obj.clangDriver.dir\ToolChains\Serenity.cpp.obj /Fdtools\clang\lib\Driver\CMakeFiles\obj.clangDriver.dir\ -c -- C:\_work\llvm-project\llvm-project\clang\lib\Driver\ToolChains\Serenity.cpp
In file included from C:\_work\llvm-project\llvm-project\clang\lib\Driver\ToolChains\Serenity.cpp:9:
In file included from C:\_work\llvm-project\llvm-project\clang\lib\Driver\ToolChains\Serenity.h:12:
In file included from C:\_work\llvm-project\llvm-project\clang\lib\Driver\ToolChains\Gnu.h:12:
In file included from C:\_work\llvm-project\llvm-project\clang\include\clang/Driver/CudaInstallationDetector.h:13:
In file included from C:\_work\llvm-project\llvm-project\clang\include\clang/Driver/Driver.h:12:
In file included from C:\_work\llvm-project\llvm-project\clang\include\clang/Basic/Diagnostic.h:17:
In file included from C:\_work\llvm-project\llvm-project\clang\include\clang/Basic/DiagnosticIDs.h:18:
In file included from C:\_work\llvm-project\llvm-project\clang\include\clang/Basic/LLVM.h:21:
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Casting.h(64,53): error: type 'const clang::driver::toolchains::Generic_ELF &' cannot be used prior to '::' because it has no members
64 |   static inline bool doit(const From &Val) { return To::classof(&Val); }
|                                                     ^
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Casting.h(81,32): note: in instantiation of member function 'llvm::isa_impl<const clang::driver::toolchains::Generic_ELF &, clang::driver::ToolChain>::doit' requested here
81 |     return isa_impl<To, From>::doit(Val);
|                                ^
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Casting.h(137,37): note: in instantiation of member function 'llvm::isa_impl_cl<const clang::driver::toolchains::Generic_ELF &, const clang::driver::ToolChain>::doit' requested here
137 |     return isa_impl_cl<To, FromTy>::doit(Val);
|                                     ^
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Casting.h(257,58): note: in instantiation of member function 'llvm::isa_impl_wrap<const clang::driver::toolchains::Generic_ELF &, const clang::driver::ToolChain, const clang::driver::ToolChain>::doit' requested here
257 |         typename simplify_type<const From>::SimpleType>::doit(f);
|                                                          ^
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Casting.h(548,37): note: in instantiation of member function 'llvm::CastIsPossible<const clang::driver::toolchains::Generic_ELF &, const clang::driver::ToolChain>::isPossible' requested here
548 |   return (CastInfo<To, const From>::isPossible(Val) || ...);
|                                     ^
C:\_work\llvm-project\llvm-project\llvm\include\llvm/Support/Casting.h(560,10): note: in instantiation of function template specialization 'llvm::isa<const clang::driver::toolchains::Generic_ELF &, clang::driver::ToolChain>' requested here
560 |   assert(isa<To>(Val) && "cast<Ty>() argument of incompatible type!");
|          ^
C:\Program Files (x86)\Windows Kits\10\include\10.0.26100.0\ucrt\assert.h(40,17): note: expanded from macro 'assert'
40 |             (!!(expression)) ||                                                               \
|                 ^
1 error generated.
```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/187941