fix build with cmake 4

Author: biojppm

bm/CMakeLists.txt

@@ -7,6 +7,10 @@ find_package(Python REQUIRED COMPONENTS Interpreter)
 # thirdparty libs that will be compared with ryml
 
 set(_ed ${CMAKE_CURRENT_BINARY_DIR}/subprojects) # casual ryml extern dir (these projects are not part of ryml and are downloaded and compiled on the fly)
+if(NOT (CMAKE_VERSION VERSION_LESS "4.0.0"))
+    c4_log(STATUS "setting CMAKE_POLICY_VERSION_MINIMUM=3.5 to compile benchmarked libs")
+    set(CMAKE_POLICY_VERSION_MINIMUM 3.5 CACHE STRING "" FORCE)
+endif()
 
 # libyaml
 c4_require_subproject(libyaml REMOTE

changelog/current.md

@@ -27,3 +27,4 @@
       !tag : !tag
     ```
 - [PR#501](https://github.com/biojppm/rapidyaml/pull/501): fix missing tag in `- !!seq []`.
+- [PR#508](https://github.com/biojppm/rapidyaml/pull/508): fix build with cmake 4.