https://github.com/python/cpython/commit/88c2fb58b518e03fd0c4161f96fa7d7a16c693e7
commit: 88c2fb58b518e03fd0c4161f96fa7d7a16c693e7
branch: 3.11
author: Miss Islington (bot) <[email protected]>
committer: brettcannon <[email protected]>
date: 2026-08-20T12:39:12-07:00
summary:

[3.11] GH-155757: Set `--argv0` for wasmtime (GH-155758) (#155798)

[3.12] GH-155757: Set `--argv0` for wasmtime (GH-155758)
(cherry picked from commit 06ba5f48e0ebdb8cfec0f251c61fb10831b23617)

Co-authored-by: Brett Cannon <[email protected]>

files:
A Misc/NEWS.d/next/Build/2026-08-13-12-57-27.gh-issue-155757._5cg0h.rst
M Tools/wasm/wasm_build.py

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
new file mode 100644
index 000000000000000..5113bc93d937015
--- /dev/null
+++ 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
index 78c749b88038689..7061954d839d2d2 100755
--- 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"
         ),

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