1 files changed, 16 insertions, 0 deletions
diff --git a/build.zig b/build.zig
index c67caf20..f8dc3e82 100644
--- a/build.zig
+++ b/build.zig
@@ -1739,6 +1739,22 @@ pub fn build(b: *std.Build) void {
             .link_libc = true,
         }) });
         unit_step.dependOn(&b.addRunArtifact(nested_test).step);
+        // The 9P2000 codec and its sans-io server. Its own module for the
+        // reason spelled out above rather than as a convention, and a stronger
+        // one than its neighbours have: 9p.zig is FREESTANDING — it imports
+        // `std` and nothing else, so that the same source compiles for
+        // wasm32- and riscv32-freestanding — and its only host-side importer
+        // is src/fs9_service.zig, which reaches pardes.zig. Compiling it here
+        // as its own root is therefore also the check that the freestanding
+        // promise still holds: NO `link_libc`, and an import of anything
+        // OS-shaped would fail this step rather than passing quietly inside
+        // the core's graph.
+        const ninep_test = b.addTest(.{ .root_module = b.createModule(.{
+            .target = target,
+            .optimize = optimize,
+            .root_source_file = b.path("src/9p.zig"),
+        }) });
+        unit_step.dependOn(&b.addRunArtifact(ninep_test).step);
         // The board's input-rescue policy: drain the receiver while spinning on a full transmitter.
         // A measured bug — a 200-byte burst typed into a long frame lost 88 bytes on the die — so
         // it gets a test that fails without the fix, and it runs HERE rather than only on hardware.