[CUDA] Document recent changes

 * Finding installations via ptxas binary
 * Relocatable device code

Differential Revision: https://reviews.llvm.org/D45449

llvm-svn: 330426

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index ced4011..f7296ba 100644 (file)
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -163,6 +163,18 @@ OpenMP Support in Clang
 
 - ...
 
+CUDA Support in Clang
+---------------------
+
+- Clang will now try to locate the CUDA installation next to :program:`ptxas`
+  in the `PATH` environment variable. This behavior can be turned off by passing
+  the new flag `--cuda-path-ignore-env`.
+
+- Clang now supports generating object files with relocatable device code. This
+  feature needs to be enabled with `-fcuda-rdc` and my result in performance
+  penalties compared to whole program compilation. Please note that NVIDIA's
+  :program:`nvcc` must be used for linking.
+
 Internal API Changes
 --------------------
 

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 99a4380..5831308 100644 (file)
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -573,7 +573,7 @@ def fno_cuda_flush_denormals_to_zero : Flag<["-"], "fno-cuda-flush-denormals-to-
 def fcuda_approx_transcendentals : Flag<["-"], "fcuda-approx-transcendentals">,
   Flags<[CC1Option]>, HelpText<"Use approximate transcendental functions">;
 def fno_cuda_approx_transcendentals : Flag<["-"], "fno-cuda-approx-transcendentals">;
-def fcuda_rdc : Flag<["-"], "fcuda-rdc">, Flags<[CC1Option, HelpHidden]>,
+def fcuda_rdc : Flag<["-"], "fcuda-rdc">, Flags<[CC1Option]>,
   HelpText<"Generate relocatable device code, also known as separate compilation mode.">;
 def fno_cuda_rdc : Flag<["-"], "fno-cuda-rdc">;
 def dA : Flag<["-"], "dA">, Group<d_Group>;