Use nixSupport instead of extraBuildCommands

pkgs/intel-oneapi/patch_intel.nix

@@ -47,6 +47,7 @@ lib.makeOverridable (
     wrapIntel =
       {
         cc,
+        nixSupport ? { },
         extraBuildCommands ? "",
         extraInstall ? "",
         ...
@@ -57,37 +58,31 @@ lib.makeOverridable (
       (
         wrapCCWith {
           inherit cc;
+
+          nixSupport = lib.mergeAttrsConcatenateValues {
+            cc-ldflags = [
+              "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}"
+              "-L${gcc.cc.lib}/lib"
+              "-L${cc}/lib"
+            ];
+            cc-cflags = [
+              "--gcc-toolchain=${gcc.cc}"
+              "-isystem \"$(dirname $(realpath ${cc}/lib/clang/*/include/stddef.h))\""
+              "-isystem ${cc}/include"
+              "-isystem ${cc}/include/intel64"
+              "-isystem ${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}/include"
+            ];
+            libcxx-cxxflags = [
+              # "--gcc-toolchain=${gcc.cc}"
+              "-isystem ${gcc.cc}/include/c++/${gcc.version}"
+              "-isystem ${gcc.cc}/include/c++/${gcc.version}/${targetConfig}"
+            ];
+          } nixSupport;
+
           extraBuildCommands = ''
-            echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
-            echo "-L${gcc.cc.lib}/lib" >> $out/nix-support/cc-ldflags
-            echo "-L${cc}/lib" >> $out/nix-support/cc-ldflags
-
-            # echo "--gcc-toolchain=${gcc.cc}" >> $out/nix-support/libcxx-cxxflags
-            echo "--gcc-toolchain=${gcc.cc}" >> $out/nix-support/cc-cflags
-
-            # For some reason, If we don't resolve the realpath things go wrong
-            for stddef in ${cc}/lib/clang/*/include/stddef.h ; do
-              dir=$(dirname $(realpath "$stddef"))
-              echo "-isystem $dir" >> $out/nix-support/cc-cflags
-            done
-
-            echo "-isystem ${cc}/include" >> $out/nix-support/cc-cflags
-            echo "-isystem ${cc}/include/intel64" >> $out/nix-support/cc-cflags
-
-            for dir in ${gcc.cc}/lib/gcc/${targetConfig}/*/include; do
-              echo "-isystem $dir" >> $out/nix-support/cc-cflags
-            done
-
-            for dir in ${gcc.cc}/include/c++/*; do
-              echo "-isystem $dir" >> $out/nix-support/libcxx-cxxflags
-            done
-            for dir in ${gcc.cc}/include/c++/*/${targetConfig}; do
-              echo "-isystem $dir" >> $out/nix-support/libcxx-cxxflags
-            done
-
             # FIXME: We should find a better way to modify the PATH instead of using
             # this ugly hack. See https://jungle.bsc.es/git/rarias/bscpkgs/issues/9
-            echo 'path_backup="${gcc.cc}/bin:$path_backup"' >> $out/nix-support/cc-wrapper-hook
+            echo 'path_backup="${gcc.cc}/bin:$path_backup"' >>$out/nix-support/cc-wrapper-hook
 
             # Disable hardening by default
             echo "" > $out/nix-support/add-hardening.sh
@@ -98,6 +93,7 @@ lib.makeOverridable (
           "cc"
           "extraBuildCommands"
           "extraInstall"
+          "nixSupport"
         ])
       ).overrideAttrs
         (old: {
@@ -178,6 +174,7 @@ lib.makeOverridable (
 
         cc = wrapIntel {
           cc = finalAttrs.finalPackage.pkgs.compiler;
+
           extraBuildCommands = ''
             wrap icx  $wrapper $ccPath/icx
             wrap icpx $wrapper $ccPath/icpx
@@ -186,11 +183,11 @@ lib.makeOverridable (
             ln -s $out/bin/icpx $out/bin/c++
             ln -s $out/bin/icx  $out/bin/cc
 
+            sed -i 's/.*isCxx=0/isCxx=1/' $out/bin/icpx
+
             # Use this to detect when a compiler subprocess is called
             # from icpx (--fsycl-host-compiler)
-            echo 'export "NIX_CC_WRAPPER_INTEL=1"' >> $out/nix-support/cc-wrapper-hook
+            echo 'export NIX_CC_WRAPPER_INTEL=1' >>$out/nix-support/cc-wrapper-hook
-
-            sed -i 's/.*isCxx=0/isCxx=1/' $out/bin/icpx
 
             # oneMath looks for sycl libraries in bin/../lib
             ln -s ${finalAttrs.finalPackage.pkgs.compiler}/lib $out/lib