cudaPackages: replace the fhs paths in pkg-config files

Cf. https://github.com/NixOS/nixpkgs/issues/224119

pkgs/development/cuda-modules/cuda/overrides.nix

@@ -115,7 +115,10 @@ attrsets.filterAttrs (attr: _: (builtins.hasAttr attr prev)) {
           moveToOutput "nvvm" "''${!outputBin}"
         '';
 
-      meta = (oldAttrs.meta or {}) // {
+      # The nvcc and cicc binaries contain hard-coded references to /usr
+      allowFHSReferences = true;
+
+      meta = (oldAttrs.meta or { }) // {
         mainProgram = "nvcc";
       };
     }

pkgs/development/cuda-modules/generic-builders/manifest.nix

@@ -94,7 +94,12 @@ backendStdenv.mkDerivation (
     # Traversed in the order of the outputs speficied in outputs;
     # entries are skipped if they don't exist in outputs.
     outputToPatterns = {
-      bin = ["bin"];
+      bin = [ "bin" ];
+      dev = [
+        "share/pkg-config"
+        "**/*.pc"
+        "**/*.cmake"
+      ];
       lib = [
         "lib"
         "lib64"
@@ -116,6 +121,22 @@ backendStdenv.mkDerivation (
       inherit (redistribRelease.${redistArch}) sha256;
     };
 
+    postPatch = ''
+      if [[ -d pkg-config ]] ; then
+        mkdir -p share/pkg-config
+        mv pkg-config/* share/pkg-config/
+        rmdir pkg-config
+      fi
+
+      for pc in share/pkg-config/*.pc ; do
+        sed -i \
+          -e "s|^cudaroot\s*=.*\$|cudaroot=''${!outputDev}|" \
+          -e "s|^libdir\s*=.*/lib\$|libdir=''${!outputLib}/lib|" \
+          -e "s|^includedir\s*=.*/include\$|includedir=''${!outputDev}/include|" \
+          "$pc"
+      done
+    '';
+
     # We do need some other phases, like configurePhase, so the multiple-output setup hook works.
     dontBuild = true;
 
@@ -197,6 +218,20 @@ backendStdenv.mkDerivation (
         runHook postInstall
       '';
 
+    doInstallCheck = true;
+    allowFHSReferences = false;
+    postInstallCheck = ''
+      echo "Executing postInstallCheck"
+
+      if [[ -z "''${allowFHSReferences-}" ]] ; then
+        mapfile -t outputPaths < <(for o in $(getAllOutputNames); do echo "''${!o}"; done)
+        if grep --max-count=5 --recursive --exclude=LICENSE /usr/ "''${outputPaths[@]}" ; then
+          echo "Detected references to /usr" >&2
+          exit 1
+        fi
+      fi
+    '';
+
     # libcuda needs to be resolved during runtime
     # NOTE: Due to the use of __structuredAttrs, we can't use a list for autoPatchelfIgnoreMissingDeps, since it
     # will take only the first value. Instead, we produce a string with the values separated by spaces.