buck2: musl -> gnu

So that we can ensure dependencies are up to date
with security patches

pkgs/by-name/bu/buck2/hashes.json

@@ -1,11 +1,11 @@
 {
-  "rust-project-aarch64-linux": "sha256-Zduna35ieycN80K2wh5OkcSaOWiqhxLJkduBk7f2XqU=",
-  "buck2-aarch64-linux": "sha256-dhqBYFQ6e5nWSrbUMUFoato1sb4bl95JcdqcgeC5mcs=",
+  "rust-project-aarch64-linux": "sha256-Pm5lEIu0hzI5BuA/LuTKjBP8S63jiz1oSB0g9tSETGU=",
+  "buck2-aarch64-linux": "sha256-Gn/Q2P0Fs93SbOawhzv8Z9DgbrIUlQ+9E3PyCNsV1pk=",
   "buck2-aarch64-darwin": "sha256-XtGs7g64s76AYhpFDbqSuSlblRauxJM0PaAk1MNNgxA=",
-  "buck2-x86_64-linux": "sha256-l/W6Bza01IyOFvHb2rlBY72Tl+JNgwmkO8EhUPWrxBY=",
+  "buck2-x86_64-linux": "sha256-gVOho7p25okvAV8OqXppdtwOOEzqH7VWcJBT4l5CT2U=",
   "rust-project-x86_64-darwin": "sha256-ePawMIfltPRK3mJJxI1BvGs6b2vIcgWzW2XTJykUsdI=",
   "version": "2025-08-15",
-  "rust-project-x86_64-linux": "sha256-3UGgvQKSm6Qohk/NDRU1fM+eFEpqM9XMLxL2AkXXrW0=",
+  "rust-project-x86_64-linux": "sha256-HKctvCiXyGFzfHfB3Qj6qR2p46i5vaaZgPg2J827ou4=",
   "buck2-x86_64-darwin": "sha256-wHk/tJJbupMsrcmXXNVXurfLY2TOSssMnuTZ7LNjASY=",
   "rust-project-aarch64-darwin": "sha256-CkyLLv41iJTKHVB0e355ZO2MV7NzQeiF1gtWEGF5oAY=",
   "prelude_fod": "sha256-cyuOMi8x8q9gd6p1obnYYDVPxyONZ+y41AFXvSbUjC0=",

pkgs/by-name/bu/buck2/package.nix

@@ -5,6 +5,7 @@
   fetchurl,
   installShellFiles,
   versionCheckHook,
+  autoPatchelfHook,
   zstd,
 }:
 
@@ -49,8 +50,8 @@ let
     {
       x86_64-darwin = "x86_64-apple-darwin";
       aarch64-darwin = "aarch64-apple-darwin";
-      x86_64-linux = "x86_64-unknown-linux-musl";
-      aarch64-linux = "aarch64-unknown-linux-musl";
+      x86_64-linux = "x86_64-unknown-linux-gnu";
+      aarch64-linux = "aarch64-unknown-linux-gnu";
     }
     ."${stdenv.hostPlatform.system}";
 in
@@ -59,7 +60,7 @@ stdenv.mkDerivation (finalAttrs: {
   version = "unstable-${buildHashes.version}"; # TODO (aseipp): kill 'unstable' once a non-prerelease is made
 
   srcs = [
-    # the platform-specific, statically linked binary — which is also
+    # the platform-specific binary — which is also
     # zstd-compressed
     (fetchurl {
       url = "https://github.com/facebook/buck2/releases/download/${lib.removePrefix "unstable-" finalAttrs.version}/buck2-${platform-suffix}.zst";
@@ -79,9 +80,15 @@ stdenv.mkDerivation (finalAttrs: {
   strictDeps = true;
   nativeBuildInputs = [
     installShellFiles
+    autoPatchelfHook
     zstd
   ];
 
+  buildInputs = [
+    #225963
+    stdenv.cc.cc.libgcc or null
+  ];
+
   installPhase = ''
     runHook preInstall
 
@@ -91,7 +98,10 @@ stdenv.mkDerivation (finalAttrs: {
     runHook postInstall
   '';
 
-  postInstall =
+  # Have to put this at a weird stage because if it is put in
+  # postInstall, preFixup, or postFixup, autoPatchelf wouldn't
+  # have run yet
+  preInstallCheck =
     let
       emulator = stdenv.hostPlatform.emulator buildPackages;
     in

pkgs/by-name/bu/buck2/update.sh

@@ -18,9 +18,9 @@ echo "Latest buck2 prerelease: $VERSION"
 echo "Compatible buck2-prelude hash: $PRELUDE_HASH"
 
 ARCHS=(
-    "x86_64-linux:x86_64-unknown-linux-musl"
+    "x86_64-linux:x86_64-unknown-linux-gnu"
     "x86_64-darwin:x86_64-apple-darwin"
-    "aarch64-linux:aarch64-unknown-linux-musl"
+    "aarch64-linux:aarch64-unknown-linux-gnu"
     "aarch64-darwin:aarch64-apple-darwin"
 )