[LLVM] Fix GPU build of libcxx/compiler-rt libraries

Summary:
Recent changes altered the name without updating this, add it in and
also tell the builtins build that C++ compilers work because it seems to
require that now.

Author: jhuber6

libcxx/cmake/caches/AMDGPU.cmake

@@ -15,9 +15,9 @@ set(LIBCXX_ENABLE_UNICODE OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_WIDE_CHARACTERS OFF CACHE BOOL "")
 set(LIBCXX_HAS_TERMINAL_AVAILABLE OFF CACHE BOOL "")
 set(LIBCXX_INSTALL_LIBRARY ON CACHE BOOL "")
-set(LIBCXX_LIBC "llvm-libc" CACHE STRING "")
 set(LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY ON CACHE BOOL "")
 set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
+set(RUNTIMES_USE_LIBC "llvm-libc" CACHE STRING "")
 
 # Configuration options for libcxxabi.
 set(LIBCXXABI_BAREMETAL ON CACHE BOOL "")

libcxx/cmake/caches/NVPTX.cmake

@@ -15,9 +15,9 @@ set(LIBCXX_ENABLE_UNICODE OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_WIDE_CHARACTERS OFF CACHE BOOL "")
 set(LIBCXX_HAS_TERMINAL_AVAILABLE OFF CACHE BOOL "")
 set(LIBCXX_INSTALL_LIBRARY ON CACHE BOOL "")
-set(LIBCXX_LIBC "llvm-libc" CACHE STRING "")
 set(LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY ON CACHE BOOL "")
 set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
+set(RUNTIMES_USE_LIBC "llvm-libc" CACHE STRING "")
 
 # Configuration options for libcxxabi.
 set(LIBCXXABI_BAREMETAL ON CACHE BOOL "")

llvm/runtimes/CMakeLists.txt

@@ -91,6 +91,7 @@ function(builtin_default_target compiler_rt_path)
                                       -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=${LLVM_ENABLE_PER_TARGET_RUNTIME_DIR}
                                       -DLLVM_CMAKE_DIR=${CMAKE_BINARY_DIR}
                                       -DCMAKE_C_COMPILER_WORKS=ON
+                                      -DCMAKE_CXX_COMPILER_WORKS=ON
                                       -DCMAKE_ASM_COMPILER_WORKS=ON
                                       ${COMMON_CMAKE_ARGS}
                                       ${BUILTINS_CMAKE_ARGS}
@@ -131,6 +132,7 @@ function(builtin_register_target compiler_rt_path name)
                                       -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON
                                       -DLLVM_CMAKE_DIR=${CMAKE_BINARY_DIR}
                                       -DCMAKE_C_COMPILER_WORKS=ON
+                                      -DCMAKE_CXX_COMPILER_WORKS=ON
                                       -DCMAKE_ASM_COMPILER_WORKS=ON
                                       -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON
                                       ${COMMON_CMAKE_ARGS}