Remove checks against _LIBCUDACXX_STD_VER < 11 (NVIDIA#375)

As part of NVIDIA#127, code for unsupported compilation modes/platforms will
be removed. `_LICUDACXX_STD_VER` macro defines which C++ standard is
used. This patch removes all checks against C++ versions before 11 and
the corresponding code.

Co-authored-by: Martin Marenz <martin.marenz@webfleet.com>

Author: 2 people

libcudacxx/include/cuda/std/detail/libcxx/include/__config

@@ -135,6 +135,10 @@ extern "C++" {
 #  endif
 #endif  // _LIBCUDACXX_STD_VER
 
+#if _LIBCUDACXX_STD_VER < 11
+#  error libcu++ requires C++11 or later
+#endif
+
 #if (defined(_LIBCUDACXX_COMPILER_NVHPC) && defined(__linux__)) \
  || defined(_LIBCUDACXX_COMPILER_NVRTC)
     #define __ELF__

libcudacxx/include/cuda/std/detail/libcxx/include/__type_traits/is_constant_evaluated.h

@@ -21,7 +21,7 @@
 _LIBCUDACXX_BEGIN_NAMESPACE_STD
 
 #if defined(_LIBCUDACXX_IS_CONSTANT_EVALUATED)
-#if (defined(__cuda_std__) && _LIBCUDACXX_STD_VER >= 11) || _LIBCUDACXX_STD_VER > 17
+#if defined(__cuda_std__) || _LIBCUDACXX_STD_VER > 17
 _LIBCUDACXX_INLINE_VISIBILITY
 inline constexpr bool is_constant_evaluated() noexcept {
   return _LIBCUDACXX_IS_CONSTANT_EVALUATED();

libcudacxx/include/cuda/std/detail/libcxx/include/barrier

@@ -73,10 +73,6 @@ namespace std
 # error <barrier> is not supported on this single threaded system
 #endif
 
-#if _LIBCUDACXX_STD_VER < 11
-# error <barrier> requires C++11 or later
-#endif
-
 _LIBCUDACXX_BEGIN_NAMESPACE_STD
 
 struct __empty_completion

libcudacxx/include/cuda/std/detail/libcxx/include/latch

@@ -58,10 +58,6 @@ namespace std
 # error <latch> is not supported on this single threaded system
 #endif
 
-#if _LIBCUDACXX_STD_VER < 11
-# error <latch> is requires C++11 or later
-#endif
-
 _LIBCUDACXX_BEGIN_NAMESPACE_STD
 
 # if _LIBCUDACXX_CUDA_ABI_VERSION < 3

libcudacxx/include/cuda/std/detail/libcxx/include/semaphore

@@ -66,10 +66,6 @@ using binary_semaphore = counting_semaphore<1>;
 # error <semaphore> is not supported on this single threaded system
 #endif
 
-#if _LIBCUDACXX_STD_VER < 11
-# error <semaphore> is requires C++11 or later
-#endif
-
 _LIBCUDACXX_BEGIN_NAMESPACE_STD
 
 template<int _Sco, ptrdiff_t __least_max_value>

libcudacxx/libcxx/src/atomic.cpp

@@ -11,7 +11,7 @@
 
 _LIBCUDACXX_BEGIN_NAMESPACE_STD
 
-#if !defined(_LIBCUDACXX_HAS_NO_THREAD_CONTENTION_TABLE) && (_LIBCUDACXX_STD_VER >= 11)
+#if !defined(_LIBCUDACXX_HAS_NO_THREAD_CONTENTION_TABLE)
 
 __libcpp_contention_t __libcpp_contention_state_[ 256 /* < there's no magic in this number */ ];
 

libcudacxx/libcxx/src/barrier.cpp

@@ -11,7 +11,7 @@
 
 _LIBCUDACXX_BEGIN_NAMESPACE_STD
 
-#if !defined(_LIBCUDACXX_HAS_NO_TREE_BARRIER) && !defined(_LIBCUDACXX_HAS_NO_THREAD_FAVORITE_BARRIER_INDEX) && (_LIBCUDACXX_STD_VER >= 11)
+#if !defined(_LIBCUDACXX_HAS_NO_TREE_BARRIER) && !defined(_LIBCUDACXX_HAS_NO_THREAD_FAVORITE_BARRIER_INDEX)
 
 _LIBCUDACXX_EXPORTED_FROM_ABI
 thread_local ptrdiff_t __libcpp_thread_favorite_barrier_index = 0;