From 1006dd54dee37793428043ad296836d7f323c7c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Simonis?= <simonisfrederic@gmail.com>
Date: Thu, 28 Apr 2022 19:03:13 +0200
Subject: [PATCH] Add BUILD_TESTING to standard CMake arguments (#30374)

CTest determines whether to enable tests using the BUILD_TESTING variable.
This should be used by projects to conditionally enable the compilation of tests.
Spack knowns which packages have to run tests and can thus automatically define this variable.
---
 lib/spack/spack/build_systems/cmake.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/spack/spack/build_systems/cmake.py b/lib/spack/spack/build_systems/cmake.py
index f934947604d..105e9d5ab85 100644
--- a/lib/spack/spack/build_systems/cmake.py
+++ b/lib/spack/spack/build_systems/cmake.py
@@ -176,6 +176,7 @@ def _std_args(pkg):
             '-G', generator,
             define('CMAKE_INSTALL_PREFIX', convert_to_posix_path(pkg.prefix)),
             define('CMAKE_BUILD_TYPE', build_type),
+            define('BUILD_TESTING', pkg.run_tests),
         ]
 
         # CMAKE_INTERPROCEDURAL_OPTIMIZATION only exists for CMake >= 3.9
@@ -361,6 +362,7 @@ def cmake_args(self):
 
             * CMAKE_INSTALL_PREFIX
             * CMAKE_BUILD_TYPE
+            * BUILD_TESTING
 
         which will be set automatically.