more test issues

overlays/x86-64-v3-workarounds.nix

@@ -0,0 +1,20 @@
+# Compatibility fixes for packages rebuilt with x86-64-v3.
+#
+# The v3 baseline enables instructions that expose source assumptions hidden
+# by the generic x86-64 build. Keep compile fixes here, separate from test
+# exclusions, until upstream or nixpkgs incorporates them.
+_final: prev:
+prev.lib.optionalAttrs ((prev.stdenv.hostPlatform.gcc.arch or null) == "x86-64-v3") {
+  deno =
+    let
+      librusty_v8 = prev.deno.passthru.librusty_v8.overrideAttrs (old: {
+        # Clang prohibits including its internal BMI2 header directly. The
+        # public umbrella supplies the same intrinsics with the required setup.
+        postPatch = (old.postPatch or "") + ''
+          substituteInPlace third_party/abseil-cpp/absl/container/internal/raw_hash_set.h \
+            --replace-fail "#include <bmi2intrin.h>" "#include <immintrin.h>"
+        '';
+      });
+    in
+    prev.deno.override { inherit librusty_v8; };
+}