pioasm: fix gcc-15 build (#484529)

pkgs/by-name/pi/pioasm/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   ninja,
 }:
@@ -16,6 +17,18 @@ stdenv.mkDerivation (finalAttrs: {
     rev = finalAttrs.version;
     hash = "sha256-epO7yw6/21/ess3vMCkXvXEqAn6/4613zmH/hbaBbUw=";
   };
+
+  patches = [
+    # Pull upstream fix for gcc-15:
+    #   https://github.com/raspberrypi/pico-sdk/pull/2468
+    (fetchpatch {
+      name = "gcc-15.patch";
+      url = "https://github.com/raspberrypi/pico-sdk/commit/66540fe88e86a9f324422b7451a3b5dff4c0449f.patch";
+      hash = "sha256-KwTED7/IWorgRTw1XMU2ILJhf6DAioGuVIunlC1QdNE=";
+      stripLen = 2;
+    })
+  ];
+
   sourceRoot = "${finalAttrs.src.name}/tools/pioasm";
 
   nativeBuildInputs = [