[3.12] GH-155757: Set --argv0 for wasmtime (#155758)

brettcannon · web-flow · commit 06ba5f48e0eb · 2026-08-14T13:42:35.000Z
diff --git a/Misc/NEWS.d/next/Build/2026-08-13-12-57-27.gh-issue-155757._5cg0h.rst b/Misc/NEWS.d/next/Build/2026-08-13-12-57-27.gh-issue-155757._5cg0h.rst
@@ -0,0 +1,3 @@
+Set the ``--argv0`` argument to wasmtime for WASI builds so the test suite
+passes. Otherwise the calculated paths to the stdlib for frozen modules is
+incorrect.
diff --git a/Tools/wasm/wasm_build.py b/Tools/wasm/wasm_build.py
@@ -318,6 +318,7 @@ def _check_wasi():
             "wasmtime run "
             "--wasm max-wasm-stack=8388608 "
             "--wasi preview2 "
+            "--argv0 /{relbuilddir}/python.wasm "
             "--dir {srcdir}::/ "
             "--env PYTHONPATH=/{relbuilddir}/build/lib.wasi-wasm32-{version}:/Lib"
         ),

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	+Set the ``--argv0`` argument to wasmtime for WASI builds so the test suite
	`2`	`+passes. Otherwise the calculated paths to the stdlib for frozen modules is`
	`3`	`+incorrect.`