[compiler-rt] [compiler-rt][test] Use fallback page size with an emulator (PR #210685)

[via llvm-commits]

https://github.com/maflcko created https://github.com/llvm/llvm-project/pull/210685

Using the fallback page size avoids executing Python with an emulator, which can fail.

E.g. the failures could look like the ones in https://github.com/llvm/llvm-project/pull/209175#issuecomment-5021551711:

* `python3: No such file or directory`
* `subprocess.TimeoutExpired: Command '['/usr/local/bin/qemu-system-riscv32',  ... , '/usr/bin/python3']' timed out after 900 seconds`

In both cases, the pre-existing `4096` fallback was then picked.

>From fa4eb28ffca82e01f00e6ce9c7d43a1cd8d95f28 Mon Sep 17 00:00:00 2001
From: MarcoFalke <*~=`'#}+{/-|&$^_ at 721217.xyz>
Date: Mon, 20 Jul 2026 13:09:03 +0200
Subject: [PATCH] [compiler-rt][test] Use fallback page size with an emulator

Using the fallback page size avoids executing Python with an emulator,
which can fail.
---
 compiler-rt/test/lit.common.cfg.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/test/lit.common.cfg.py b/compiler-rt/test/lit.common.cfg.py
index c038b57f9e982..396aee7c3947d 100644
--- a/compiler-rt/test/lit.common.cfg.py
+++ b/compiler-rt/test/lit.common.cfg.py
@@ -968,9 +968,12 @@ def is_windows_lto_supported():
 def target_page_size():
     if config.target_arch in ("amdgcn", "nvptx64"):
         return 4096
+    if emulator:
+        # Emulators may not provide a target-side Python executable.
+        return 4096
     try:
         proc = subprocess.Popen(
-            f"{emulator or ''} {shlex.quote(config.python_executable)}",
+            shlex.quote(config.python_executable),
             shell=True,
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,