From 70334d74dcb20b8029a4df0e55de29ca51b6c767 Mon Sep 17 00:00:00 2001
From: Alexander Grund <alexander.grund@tu-dresden.de>
Date: Wed, 11 Sep 2024 14:30:32 +0200
Subject: [PATCH] Run subset tests with C-locale

One problematic input is `--instance=wdth=112.5` which is parsed using
the users local (`strtof`).
So while in C or US locales it yields 112.5 in some European locales it
yields 112 as the dot is not valid in this position.

A European user might pass "112,5" instead but for the test the C locale
is assumed, so enforce it.

Fixes #4854
---
 test/subset/run-tests.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/subset/run-tests.py b/test/subset/run-tests.py
index 9e09d95d1..c0c256d89 100755
--- a/test/subset/run-tests.py
+++ b/test/subset/run-tests.py
@@ -135,10 +135,13 @@ if not len (args):
 
 has_ots = has_ots()
 
+env = os.environ.copy()
+env['LC_ALL'] = 'C'
 process = subprocess.Popen ([hb_subset, '--batch'],
                             stdin=subprocess.PIPE,
                             stdout=subprocess.PIPE,
-                            stderr=sys.stdout)
+                            stderr=sys.stdout,
+                            env=env)
 
 fails = 0
 for path in args: