Merge pull request #81191 from clkamp/stdenv-multi-line-libc-cflags

stdenv: Fix gcc multi line libc-cflags

pkgs/build-support/cc-wrapper/default.nix

@@ -363,7 +363,11 @@ stdenv.mkDerivation {
       done
     ''
 
+    # There are a few tools (to name one libstdcxx5) which do not work
+    # well with multi line flags, so make the flags single line again
     + ''
+      substituteInPlace $out/nix-support/libc-cflags --replace $'\n' ' '
+
       substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
       substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
       substituteAll ${../wrapper-common/utils.bash} $out/nix-support/utils.bash