[CUDA] Updated CompileCudaWithLLVM doc.

llvm/docs/CompileCudaWithLLVM.rst

@@ -22,21 +22,22 @@ Compiling CUDA Code
 Prerequisites
 -------------
 
-CUDA is supported since llvm 3.9. Current release of clang (7.0.0) supports CUDA
-7.0 through 9.2. If you need support for CUDA 10, you will need to use clang
-built from r342924 or newer.
+CUDA is supported since llvm 3.9. Clang currently supports CUDA 7.0 through
+10.1. If clang detects a newer CUDA version, it will issue a warning and will
+attempt to use detected CUDA SDK it as if it were CUDA-10.1.
 
-Before you build CUDA code, you'll need to have installed the appropriate driver
-for your nvidia GPU and the CUDA SDK.  See `NVIDIA's CUDA installation guide
+Before you build CUDA code, you'll need to have installed the CUDA SDK.  See
+`NVIDIA's CUDA installation guide
 <https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html>`_ for
-details.  Note that clang `does not support
+details.  Note that clang `maynot support
 <https://llvm.org/bugs/show_bug.cgi?id=26966>`_ the CUDA toolkit as installed by
-many Linux package managers; you probably need to install CUDA in a single
-directory from NVIDIA's package.
+some Linux package managers. Clang does attempt to deal with specific details of
+CUDA installation on a handful of common Linux distributions, but in general the
+most reliable way to make it work is to install CUDA in a single directory from
+NVIDIA's `.run` package and specify its location via `--cuda-path=...` argument.
 
 CUDA compilation is supported on Linux. Compilation on MacOS and Windows may or
-may not work and currently have no maintainers. Compilation with CUDA-9.x is
-`currently broken on Windows <https://bugs.llvm.org/show_bug.cgi?id=38811>`_.
+may not work and currently have no maintainers.
 
 Invoking clang
 --------------