nix: fix unicorn build on 32bit systems (#2737)

* nix: fix unicorn build on 32bit systems

* nix: fix unicorn build on 32bit systems

flake.nix

@@ -55,7 +55,7 @@
         "riscv64" = "riscv64";
         "s390x" = "s390x";
         "ppc64" = "ppc64";
-        "ppc64le" = "powernv";  # broken gdb ;(
+        "ppc64le" = "powernv"; # broken gdb ;(
         "loong64" = "loongarch64-linux"; # broken stdenv: https://github.com/NixOS/nixpkgs/issues/380901
       };
       mapKeysWithName =

nix/pyenv.nix

@@ -208,6 +208,10 @@ let
       prev.unicorn.overrideAttrs (
         old:
         lib.optionalAttrs ((isBuildSource old)) {
+          # On 32bit system failed to build: https://github.com/pwndbg/pwndbg/issues/2588#issuecomment-2659498870
+          # Since GCC-14 `-Wreturn-mismatch` is turned into an error by default.
+          NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.is32bit "-Wno-return-mismatch";
+
           nativeBuildInputs =
             old.nativeBuildInputs
             ++ [
@@ -219,9 +223,9 @@ let
             ];
 
           postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''
-              substituteInPlace ./src/CMakeLists.txt \
-                  --replace-fail 'set(CMAKE_C_COMPILER "/usr/bin/cc")' 'set(CMAKE_C_COMPILER "${stdenv.cc}/bin/cc")' || true
-            '';
+            substituteInPlace ./src/CMakeLists.txt \
+                --replace-fail 'set(CMAKE_C_COMPILER "/usr/bin/cc")' 'set(CMAKE_C_COMPILER "${stdenv.cc}/bin/cc")' || true
+          '';
         }
       )
     ) { };