cudaPackages: 11_5 -> 11_6, recover from gcc10->gcc11

11_5 is not compatible with glibc2.4 which became the default after
gcc10->gcc11 bump
11_6 has a fix for glibc2.4 support
cudaPackages attribute now points at cudaPackages_11_6

pkgs/development/compilers/cudatoolkit/versions.toml

@@ -44,13 +44,13 @@ gcc = "gcc9"
 version = "11.4.2"
 url = "https://developer.download.nvidia.com/compute/cuda/11.4.2/local_installers/cuda_11.4.2_470.57.02_linux.run"
 sha256 = "sha256-u9h8oOkT+DdFSnljZ0c1E83e9VUILk2G7Zo4ZZzIHwo="
-gcc = "gcc11"
+gcc = "gcc10"
 
 ["11.5"]
 version = "11.5.0"
 url = "https://developer.download.nvidia.com/compute/cuda/11.5.0/local_installers/cuda_11.5.0_495.29.05_linux.run"
 sha256 = "sha256-rgoWk9lJfPPYHmlIlD43lGNpANtxyY1Y7v2sr38aHkw="
-gcc = "gcc11"
+gcc = "gcc10" # cuda 11.5 has problems with glibc 2.4 -> keeping gcc10
 
 ["11.6"]
 version = "11.6.1"

pkgs/top-level/all-packages.nix

@@ -4882,7 +4882,7 @@ with pkgs;
   cudaPackages_11_4 = callPackage ./cuda-packages.nix { cudaVersion = "11.4"; };
   cudaPackages_11_5 = callPackage ./cuda-packages.nix { cudaVersion = "11.5"; };
   cudaPackages_11_6 = callPackage ./cuda-packages.nix { cudaVersion = "11.6"; };
-  cudaPackages_11 = cudaPackages_11_5;
+  cudaPackages_11 = cudaPackages_11_6;
   cudaPackages = recurseIntoAttrs cudaPackages_11;
 
   # TODO: move to alias