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Use PYODIDE environment variable for Emscripten cross-compilation detection #21714

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Merged
ilevkivskyi merged 1 commit into from
Jul 10, 2026
+6 −6
Merged

Use PYODIDE environment variable for Emscripten cross-compilation detection #21714

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12 changes: 6 additions & 6 deletions mypy/options.py
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Original file line number Diff line number Diff line change
@@ -1,9 +1,9 @@
from __future__ import annotations

import os
import pprint
import re
import sys
import sysconfig
from collections.abc import Callable
from re import Pattern
from typing import Any, Final
Expand Down Expand Up @@ -112,11 +112,11 @@ def __init__(self) -> None:
# then mypy does not search for PEP 561 packages.
self.python_executable: str | None = sys.executable

# When cross compiling to emscripten, we need to rely on MACHDEP because
# sys.platform is the host build platform, not emscripten.
MACHDEP = sysconfig.get_config_var("MACHDEP")
if MACHDEP == "emscripten":
self.platform = MACHDEP
# When cross compiling to emscripten, sys.platform is the host build
# platform, not emscripten. Pyodide sets the PYODIDE environment variable
# at build time, so we use it to detect the emscripten target.
if "PYODIDE" in os.environ:
self.platform = "emscripten"
else:
self.platform = sys.platform

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