diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index 3738f628b18..ac6257220fd 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -14,6 +14,7 @@
 , nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
 , propagateDoc ? cc != null && cc ? man
 , extraTools ? [], extraPackages ? [], extraBuildCommands ? ""
+, nixSupport ? {}
 , isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
 , buildPackages ? {}
 , libcxx ? null
@@ -155,6 +156,8 @@ stdenv.mkDerivation {
             (setenv "NIX_CFLAGS_COMPILE_${suffixSalt}" (concat (getenv "NIX_CFLAGS_COMPILE_${suffixSalt}") " -isystem " arg "/include"))))
         '(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
     '';
+
+    inherit nixSupport;
   };
 
   dontBuild = true;
@@ -521,7 +524,11 @@ stdenv.mkDerivation {
     ##
     ## Extra custom steps
     ##
-    + extraBuildCommands;
+    + extraBuildCommands
+    + lib.strings.concatStringsSep "; "
+      (lib.attrsets.mapAttrsToList
+        (name: value: "echo ${toString value} >> $out/nix-support/${name}")
+        nixSupport);
 
   inherit expand-response-params;
 
diff --git a/pkgs/development/compilers/llvm/14/default.nix b/pkgs/development/compilers/llvm/14/default.nix
index 4e5e85684a2..b18b558d5b8 100644
--- a/pkgs/development/compilers/llvm/14/default.nix
+++ b/pkgs/development/compilers/llvm/14/default.nix
@@ -158,16 +158,17 @@ let
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind
       ];
-      extraBuildCommands = ''
-        echo "-rtlib=compiler-rt -Wno-unused-command-line-argument" >> $out/nix-support/cc-cflags
-        echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
-        echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
-        echo "-lunwind" >> $out/nix-support/cc-ldflags
-      '' + lib.optionalString stdenv.targetPlatform.isWasm ''
-        echo "-fno-exceptions" >> $out/nix-support/cc-cflags
-      '' + mkExtraBuildCommands cc;
+      extraBuildCommands = mkExtraBuildCommands cc;
+      nixSupport.cc-cflags =
+        [ "-rtlib=compiler-rt"
+          "-Wno-unused-command-line-argument"
+          "-B${targetLlvmLibraries.compiler-rt}/lib"
+        ]
+        ++ lib.optional (!stdenv.targetPlatform.isWasm) "--unwindlib=libunwind"
+        ++ lib.optional
+          (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false)
+          "-lunwind"
+        ++ lib.optional stdenv.targetPlatform.isWasm "-fno-exceptions";
     };
 
     clangNoLibcxx = wrapCCWith rec {
@@ -177,11 +178,12 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = ''
-        echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
-        echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
-        echo "-nostdlib++" >> $out/nix-support/cc-cflags
-      '' + mkExtraBuildCommands cc;
+      extraBuildCommands = mkExtraBuildCommands cc;
+      nixSupport.cc-cflags = [
+        "-rtlib=compiler-rt"
+        "-B${targetLlvmLibraries.compiler-rt}/lib"
+        "-nostdlib++"
+      ];
     };
 
     clangNoLibc = wrapCCWith rec {
@@ -191,10 +193,11 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = ''
-        echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
-        echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
-      '' + mkExtraBuildCommands cc;
+      extraBuildCommands = mkExtraBuildCommands cc;
+      nixSupport.cc-cflags = [
+        "-rtlib=compiler-rt"
+        "-B${targetLlvmLibraries.compiler-rt}/lib"
+      ];
     };
 
     clangNoCompilerRt = wrapCCWith rec {
@@ -202,9 +205,8 @@ let
       libcxx = null;
       bintools = bintoolsNoLibc';
       extraPackages = [ ];
-      extraBuildCommands = ''
-        echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '' + mkExtraBuildCommands0 cc;
+      extraBuildCommands = mkExtraBuildCommands0 cc;
+      nixSupport.cc-cflags = [ "-nostartfiles" ];
     };
 
     clangNoCompilerRtWithLibc = wrapCCWith rec {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6c8ac77b903..32e305e10af 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14037,6 +14037,7 @@ with pkgs;
       # default.
       libcxx ? null
     , extraPackages ? lib.optional (cc.isGNU or false && stdenv.targetPlatform.isMinGW) threadsCross
+    , nixSupport ? {}
     , ...
     } @ extraArgs:
       callPackage ../build-support/cc-wrapper (let self = {
@@ -14048,7 +14049,7 @@ with pkgs;
     isGNU = cc.isGNU or false;
     isClang = cc.isClang or false;
 
-    inherit cc bintools libc libcxx extraPackages zlib;
+    inherit cc bintools libc libcxx extraPackages nixSupport zlib;
   } // extraArgs; in self);
 
   wrapCC = cc: wrapCCWith {