[clang] [clang][lit] mkdir before mkstemp in is_filesystem_case_insensitive() (PR #131036)

[Arthur Eubanks via cfe-commits]

https://github.com/aeubanks created https://github.com/llvm/llvm-project/pull/131036

In the CMake build test_exec_root already exists here, but not in the gn build, which causes this to fail.

>From 6ab707eec90cbe1d8a8f5ddf19765f514b275095 Mon Sep 17 00:00:00 2001
From: Arthur Eubanks <aeubanks at google.com>
Date: Wed, 12 Mar 2025 21:42:47 +0000
Subject: [PATCH] [clang][lit] mkdir before mkstemp in
 is_filesystem_case_insensitive()

In the CMake build test_exec_root already exists here, but not in the gn build, which causes this to fail.
---
 clang/test/lit.cfg.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang/test/lit.cfg.py b/clang/test/lit.cfg.py
index 9820ddd1f14af..074167fa6cad3 100644
--- a/clang/test/lit.cfg.py
+++ b/clang/test/lit.cfg.py
@@ -253,6 +253,7 @@ def have_host_clang_repl_cuda():
 
 
 def is_filesystem_case_insensitive():
+    os.mkdir(config.test_exec_root)
     handle, path = tempfile.mkstemp(prefix="case-test", dir=config.test_exec_root)
     isInsensitive = os.path.exists(
         os.path.join(os.path.dirname(path), os.path.basename(path).upper())