From d64b2910e2546ba8e94ca8021f238afa293cfa25 Mon Sep 17 00:00:00 2001
From: Chris Hennes <chennes@pioneerlibrarysystem.org>
Date: Mon, 15 Jun 2026 20:46:10 -0500
Subject: [PATCH] Force UTF-8 standard I/O for children

---
 compile_all.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/compile_all.py b/compile_all.py
index 63df790..b707807 100644
--- a/compile_all.py
+++ b/compile_all.py
@@ -982,6 +982,14 @@ def _run_pip_install(
             env = os.environ.copy()
             env["DISTUTILS_USE_SDK"] = "1"
             env["MSSdk"] = "1"
+            # Force UTF-8 standard I/O for every child process pip spawns. When the parent
+            # environment sets PYTHONIOENCODING to a UTF-16 codec (PyCharm run configurations
+            # can do this), meson-python's build backend launches "meson --version", which
+            # emits its version as UTF-16, then decodes the captured bytes with the locale
+            # codepage. The result is NUL-interleaved text that meson-python's version parser
+            # silently treats as version 0, aborting the scipy source build with a misleading
+            # "Could not find meson version 0.63.3 or newer, found 1.11.1" error.
+            env["PYTHONIOENCODING"] = "utf-8"
             # kiwisolver's pyproject.toml declares dynamic version via setuptools_scm,
             # which falls back to "0.0.0" outside a git checkout. Pip's metadata
             # consistency check then rejects the sdist (requested 1.5.0, got 0.0.0).