Merge pull request #630 from bartlettroscoe/cmake-4.0.0-2

Set CMake policy CMP0144 to new to use <PACKAGENAME>_ROOT env vars

Author: bartlettroscoe

tribits/CHANGELOG.md

@@ -2,6 +2,15 @@
 ChangeLog for TriBITS
 ----------------------------------------
 
+## 2025-03-22:
+
+* **Changed:** Set CMake policy
+  [CMP0144](https://cmake.org/cmake/help/latest/policy/CMP0144.html) to `NEW`
+  (for versions of CMake 3.27+) so that `find_package(<PackageName> ...)` will
+  use upper case env var `<PACKAGENAME>_ROOT`.  Now, systems that are setting
+  uppercase env var names for standard packages will get picked in CMake
+  configures.
+
 ## 2025-02-17:
 
 * **Added:** Added support for header-only libraries with

tribits/core/common/TribitsCMakePolicies.cmake

@@ -7,11 +7,17 @@
 # *****************************************************************************
 # @HEADER
 
+macro(tribits_set_cmake_policy_if_exists  policyName  oldOrNew)
+  if (POLICY ${policyName})
+    cmake_policy(SET ${policyName} ${oldOrNew})
+  endif()
+endmacro()
+
 # Define policies for CMake
-# It is assumed that the project has already called CMAKE_MINIMUM_REQUIRED.
-cmake_policy(SET CMP0003 NEW) # Don't split up full lib paths to linker args
-cmake_policy(SET CMP0007 NEW) # Don't ignore empty list items
-cmake_policy(SET CMP0053 NEW) # Make var references much faster
-cmake_policy(SET CMP0054 NEW) # Avoid quoted strings lookup variables
-cmake_policy(SET CMP0057 NEW) # Support if ( ... IN_LIST ... )
-cmake_policy(SET CMP0082 NEW) # Install rules follow order install() called in subdirs
+tribits_set_cmake_policy_if_exists(CMP0003 NEW) # Don't split up full lib paths to linker args
+tribits_set_cmake_policy_if_exists(CMP0007 NEW) # Don't ignore empty list items
+tribits_set_cmake_policy_if_exists(CMP0053 NEW) # Make var references much faster
+tribits_set_cmake_policy_if_exists(CMP0054 NEW) # Avoid quoted strings lookup variables
+tribits_set_cmake_policy_if_exists(CMP0057 NEW) # Support if ( ... IN_LIST ... )
+tribits_set_cmake_policy_if_exists(CMP0082 NEW) # Install rules follow order install() called in subdirs
+tribits_set_cmake_policy_if_exists(CMP0144 NEW) # find_package() use <PACKAGENAME>_ROOT env var