ompss: set flags when intel

pkgs/intel-oneapi/patch_intel.nix

@@ -151,6 +151,10 @@ stdenvNoCC.mkDerivation (finalAttrs: {
         ln -s $out/bin/icpx $out/bin/c++
         ln -s $out/bin/icx  $out/bin/cc
 
+        # Use this to detect when a compiler subprocess is called
+        # from icpx (--fsycl-host-compiler)
+        echo 'export "NIX_CC_WRAPPER_INTEL=1"' >> $out/nix-support/cc-wrapper-hook
+
         sed -i 's/.*isCxx=0/isCxx=1/' $out/bin/icpx
 
         ln -s ${finalAttrs.finalPackage.pkgs.compiler}/lib $out/lib

pkgs/llvm-ompss2/default.nix

@@ -3,6 +3,7 @@
 , lib
 , gcc
 , clangOmpss2Unwrapped
+, writeShellScript
 , openmp ? null
 , wrapCCWith
 , llvmPackages_latest
@@ -34,6 +35,15 @@ let
   targetConfig = stdenv.targetPlatform.config;
   inherit gcc;
   cc = clangOmpss2Unwrapped;
+
+  resetIntelCCFlags = let tconf = builtins.replaceStrings ["-"] ["_"] targetConfig;
+  in writeShellScript "remove-intel.sh" ''
+    if [ "$NIX_CC_WRAPPER_INTEL" = 1 ]; then
+      unset NIX_CC_WRAPPER_FLAGS_SET_${tconf}
+      unset NIX_BINTOOLS_WRAPPER_FLAGS_${tconf}
+    fi
+  '';
+
 in wrapCCWith {
   inherit cc bintools;
   # extraPackages adds packages to depsTargetTargetPropagated
@@ -58,6 +68,9 @@ in wrapCCWith {
 
     wrap clang++  $wrapper $ccPath/clang++
 
+    sed -i 's|# Flirting.*|&\nsource ${resetIntelCCFlags}|' $out/bin/clang
+    sed -i 's|# Flirting.*|&\nsource ${resetIntelCCFlags}|' $out/bin/clang++
+
     echo "" > $out/nix-support/add-hardening.sh
 
   '' + lib.optionalString (openmp != null) ''