From 2f9211b4e420b34de7343e7d7b5333b49bf1b36d Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 3 Apr 2025 15:12:26 -0400
Subject: [PATCH] Tests: Isolate RunCMake.LinkWarningAsError from -Werror flags
 in environment

Fixes: #26836
---
 Tests/RunCMake/LinkWarningAsError/RunCMakeTest.cmake | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Tests/RunCMake/LinkWarningAsError/RunCMakeTest.cmake b/Tests/RunCMake/LinkWarningAsError/RunCMakeTest.cmake
index 16b72dd8fea..09ec4a4c730 100644
--- a/Tests/RunCMake/LinkWarningAsError/RunCMakeTest.cmake
+++ b/Tests/RunCMake/LinkWarningAsError/RunCMakeTest.cmake
@@ -1,5 +1,15 @@
 include(RunCMake)
 
+# Isolate test cases from the caller's environment.
+if(DEFINED ENV{CFLAGS})
+  string(REGEX REPLACE "-Werror[^ ]*" "" cflags "$ENV{CFLAGS}")
+  set(ENV{CFLAGS} "${cflags}")
+endif()
+if(DEFINED ENV{LDFLAGS})
+  string(REGEX REPLACE "-Wl,--fatal-warnings[^ ]*" "" ldflags "$ENV{LDFLAGS}")
+  set(ENV{LDFLAGS} "${ldflags}")
+endif()
+
 run_cmake(BadValue)
 
 function(run_link_warn test)
-- 
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