[CMAKE] set CMP0074 policy to NEW (honour <packagename>_ROOT)

Fixes SyneRBI#1260
KrisThielemans · May 31, 2024 · f82b1fe · f82b1fe
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diff --git a/CHANGES.md b/CHANGES.md
@@ -1,5 +1,10 @@
 # ChangeLog
 
+## v3.8.0
+
+* CMake/building:
+- set CMP0074 policy to NEW, i.e. honour <packagename>_ROOT env variables
+
 ## v3.7.0
 
 * SIRF/common

diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -25,6 +25,10 @@ cmake_minimum_required(VERSION 3.9.0)
 # require 3.3 for descent FindMatlab.cmake
 # require 3.9 for compatible FindOPENMP.cmake
 
+if (POLICY CMP0074)
+  # honour <packagename>_ROOT env variables
+  cmake_policy(SET CMP0074 NEW)
+endif()
 
 # Set the CMake policy for SWIG
 # https://cmake.org/cmake/help/v3.14/policy/CMP0078.html#policy:CMP0078