Fix and Update Nix Flake

flake.nix

@@ -163,28 +163,22 @@
             reuse
             cppcheck
             pre-commit
-            ruby # for pre-commit markdownlint hook
+            ruby # For pre-commit markdownlint hook
           ];
 
           mkShellFor =
             stdenv: pkg:
             stdenv.mkDerivation {
               name = "${pkg.pname}-${stdenv.cc.cc.pname}-devShell";
 
-              # disable all hardening to suppress warnings in debug builds
+              # Disable all hardening to suppress warnings in debug builds
               hardeningDisable = [ "all" ];
 
-              # inherit inputs from pkg
+              # Inherit inputs from pkg
               buildInputs = pkg.buildInputs ++ packages;
               nativeBuildInputs = pkg.nativeBuildInputs ++ packages;
               propagatedBuildInputs = pkg.propagatedBuildInputs;
               propagatedNativeBuildInputs = pkg.propagatedNativeBuildInputs;
-
-              # configure nix-ld for pre-commit
-              env = {
-                NIX_LD = lib.fileContents "${stdenv.cc}/nix-support/dynamic-linker";
-                NIX_LD_LIBRARY_PATH = lib.makeLibraryPath [ pkgs.gcc-unwrapped.lib ];
-              };
             };
         in
         rec {

packaging/nix/opendssc.nix

@@ -2,12 +2,15 @@
 # SPDX-License-Identifier: Apache-2.0
 {
   lib,
-  stdenv,
+  gcc14Stdenv,
   cmake,
   fetchsvn,
   libuuid,
 }:
-stdenv.mkDerivation {
+
+# We need to stick to gcc14 because OpenDSS is broken and doesn't build on GCC 15.
+# See: https://sourceforge.net/p/electricdss/discussion/experts/thread/732634c990/
+gcc14Stdenv.mkDerivation {
   pname = "opendssc";
   version = "10.1.0.1";
 

packaging/nix/villas.nix

@@ -46,7 +46,7 @@
   lib,
   makeWrapper,
   pkg-config,
-  stdenv,
+  gcc14Stdenv,
   system,
   # Optional dependencies
   boxfort,
@@ -92,7 +92,10 @@
   spdlog,
   linuxHeaders,
 }:
-stdenv.mkDerivation {
+
+# We need to stick to gcc14 because OpenDSS is broken and doesn't build on GCC 15.
+# See: https://sourceforge.net/p/electricdss/discussion/experts/thread/732634c990/
+gcc14Stdenv.mkDerivation {
   inherit src version;
   pname = "villas";
   outputs = [