Add host std lib version detection (#6678)

Author: davebayer

libcudacxx/include/cuda/std/__cccl/host_std_lib.h

@@ -23,9 +23,9 @@
 #  pragma system_header
 #endif // no system header
 
-#define _CCCL_HOST_STD_LIB_LIBSTDCXX() 0
-#define _CCCL_HOST_STD_LIB_LIBCXX()    0
-#define _CCCL_HOST_STD_LIB_STL()       0
+#define _CCCL_HOST_STD_LIB_LIBSTDCXX() _CCCL_VERSION_INVALID()
+#define _CCCL_HOST_STD_LIB_LIBCXX()    _CCCL_VERSION_INVALID()
+#define _CCCL_HOST_STD_LIB_STL()       _CCCL_VERSION_INVALID()
 
 // include a minimal header
 #if _CCCL_HAS_INCLUDE(<version>)
@@ -34,19 +34,26 @@
 #  include <ciso646>
 #endif // ^^^ _CCCL_HAS_INCLUDE(<ciso646>) ^^^
 
+#define _CCCL_HOST_STD_LIB_MAKE_VERSION(_MAJOR, _MINOR) ((_MAJOR) * 100 + (_MINOR))
+#define _CCCL_HOST_STD_LIB(...)                         _CCCL_VERSION_COMPARE(_CCCL_HOST_STD_LIB_, _CCCL_HOST_STD_LIB_##__VA_ARGS__)
+
 #if defined(_MSVC_STL_VERSION)
 #  undef _CCCL_HOST_STD_LIB_STL
-#  define _CCCL_HOST_STD_LIB_STL() 1
+#  define _CCCL_HOST_STD_LIB_STL() (_MSVC_STL_VERSION, 0)
 #elif defined(__GLIBCXX__)
 #  undef _CCCL_HOST_STD_LIB_LIBSTDCXX
-#  define _CCCL_HOST_STD_LIB_LIBSTDCXX() 1
+#  define _CCCL_HOST_STD_LIB_LIBSTDCXX() (_GLIBCXX_RELEASE, 0)
 #elif defined(_LIBCPP_VERSION)
 #  undef _CCCL_HOST_STD_LIB_LIBCXX
-#  define _CCCL_HOST_STD_LIB_LIBCXX() 1
+// since llvm-16, the version scheme has been changed from MMppp to MMmmpp
+#  if _LIBCPP_VERSION / 10000 < 2
+#    define _CCCL_HOST_STD_LIB_LIBCXX() (_LIBCPP_VERSION / 1000, 0)
+#  else
+#    define _CCCL_HOST_STD_LIB_LIBCXX() (_LIBCPP_VERSION / 10000, (_LIBCPP_VERSION / 100) % 100)
+#  endif
 #endif // ^^^ _LIBCPP_VERSION ^^^
 
-#define _CCCL_HOST_STD_LIB(_X) _CCCL_HOST_STD_LIB_##_X()
 #define _CCCL_HAS_HOST_STD_LIB() \
-  (_CCCL_HOST_STD_LIB_LIBSTDCXX() || _CCCL_HOST_STD_LIB_LIBCXX() || _CCCL_HOST_STD_LIB_STL())
+  (_CCCL_HOST_STD_LIB(LIBSTDCXX) || _CCCL_HOST_STD_LIB(LIBCXX) || _CCCL_HOST_STD_LIB(STL))
 
 #endif // __CCCL_HOST_STD_LIB_H