handle Clang-CUDA (#2075)

* do not require protection from macroized `new` for Clang in Cuda mode
* Don't check NVCC version if `__CUDACC_VER_MAJOR__` is not defined

which admits both clang-CUDA and `cl /showIncludes /D__CUDACC__` into the STL.

stl/inc/__msvc_all_public_headers.hpp

@@ -13,9 +13,11 @@
 #pragma warning(1 : 4668) // 'MEOW' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'
 
 // All STL headers should protect themselves from macroized new.
+#if !(defined(__CUDACC__) && defined(__clang__))
 #pragma push_macro("new")
 #undef new
 #define new WILL NOT COMPILE
+#endif // !(defined(__CUDACC__) && defined(__clang__))
 
 // VSO-768746: mbctype.h macroizes _MS, _MP, _M1, and _M2. Include it first for test coverage.
 #ifndef _MSVC_TESTING_NVCC
@@ -232,7 +234,9 @@
 #endif // _M_CEE_PURE
 #endif // _MSVC_TESTING_NVCC
 
+#if !(defined(__CUDACC__) && defined(__clang__))
 #pragma pop_macro("new")
+#endif // !(defined(__CUDACC__) && defined(__clang__))
 
 #pragma warning(pop)
 

stl/inc/yvals_core.h

@@ -584,7 +584,7 @@
 #define _MSVC_STL_UPDATE  202112L
 
 #ifndef _ALLOW_COMPILER_AND_STL_VERSION_MISMATCH
-#ifdef __CUDACC__
+#if defined(__CUDACC__) && defined(__CUDACC_VER_MAJOR__)
 #if __CUDACC_VER_MAJOR__ < 10      \
     || (__CUDACC_VER_MAJOR__ == 10 \
         && (__CUDACC_VER_MINOR__ < 1 || (__CUDACC_VER_MINOR__ == 1 && __CUDACC_VER_BUILD__ < 243)))