clang_11: forward-port #91293

(cherry picked from commit 7a30df9225e3c47080744535ccbb0a1202b36a3a)

2 files changed, 6 insertions, 6 deletions

diff --git a/nixpkgs/pkgs/development/compilers/llvm/11/clang/default.nix b/nixpkgs/pkgs/development/compilers/llvm/11/clang/default.nix
index 2aefc884d48e..4f5e20cfe770 100644
--- a/nixpkgs/pkgs/development/compilers/llvm/11/clang/default.nix
+++ b/nixpkgs/pkgs/development/compilers/llvm/11/clang/default.nix
@@ -86,8 +86,6 @@ let
     passthru = {
       isClang = true;
       inherit llvm;
-    } // stdenv.lib.optionalAttrs (stdenv.targetPlatform.isLinux || (stdenv.cc.isGNU && stdenv.cc.cc ? gcc)) {
-      gcc = if stdenv.cc.isGNU then stdenv.cc.cc else stdenv.cc.cc.gcc;
     };
 
     meta = {
diff --git a/nixpkgs/pkgs/development/compilers/llvm/11/default.nix b/nixpkgs/pkgs/development/compilers/llvm/11/default.nix
index 0b091c60973a..a404d1606957 100644
--- a/nixpkgs/pkgs/development/compilers/llvm/11/default.nix
+++ b/nixpkgs/pkgs/development/compilers/llvm/11/default.nix
@@ -1,5 +1,6 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake
+{ lowPrio, newScope, pkgs, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
+, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -25,8 +26,8 @@ let
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
-    '' + stdenv.lib.optionalString (stdenv.targetPlatform.isLinux && tools.clang-unwrapped ? gcc && !(stdenv.targetPlatform.useLLVM or false)) ''
-      echo "--gcc-toolchain=${tools.clang-unwrapped.gcc}" >> $out/nix-support/cc-cflags
+    '' + stdenv.lib.optionalString (stdenv.targetPlatform.isLinux && !(stdenv.targetPlatform.useLLVM or false)) ''
+      echo "--gcc-toolchain=${gccForLibs}" >> $out/nix-support/cc-cflags
     '';
   in {
 
@@ -60,7 +61,8 @@ let
 
     libstdcxxClang = wrapCCWith rec {
       cc = tools.clang-unwrapped;
-      libcxx = null; # libstdcxx is smuggled in with clang.gcc
+      # libstdcxx is taken from gcc in an ad-hoc way in cc-wrapper.
+      libcxx = null;
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];