[cmake] Require CMake 3.15 or newer

Author: gruenich

CMakeLists.txt

@@ -1,12 +1,6 @@
 # 3.5 is actually available almost everywhere.
 # 3.30 as the upper policy limit avoids CMake deprecation warnings.
-cmake_minimum_required(VERSION 3.5...3.30)
-
-# enable MSVC_RUNTIME_LIBRARY target property
-# see https://cmake.org/cmake/help/latest/policy/CMP0091.html
-if(POLICY CMP0091)
-  cmake_policy(SET CMP0091 NEW)
-endif()
+cmake_minimum_required(VERSION 3.15...4.0)
 
 project(YAML_CPP VERSION 0.8.0 LANGUAGES CXX)
 
@@ -63,10 +57,8 @@ endif()
 
 set(contrib-pattern "src/contrib/*.cpp")
 set(src-pattern "src/*.cpp")
-if (CMAKE_VERSION VERSION_GREATER 3.12)
-  list(INSERT contrib-pattern 0 CONFIGURE_DEPENDS)
-  list(INSERT src-pattern 0 CONFIGURE_DEPENDS)
-endif()
+list(INSERT contrib-pattern 0 CONFIGURE_DEPENDS)
+list(INSERT src-pattern 0 CONFIGURE_DEPENDS)
 
 file(GLOB yaml-cpp-contrib-sources ${contrib-pattern})
 file(GLOB yaml-cpp-sources ${src-pattern})
@@ -79,8 +71,6 @@ set(msvc-rt-mt-static $<STREQUAL:${msvc-rt},MultiThreaded>)
 set(msvc-rt-mtd-dll $<STREQUAL:${msvc-rt},MultiThreadedDebugDLL>)
 set(msvc-rt-mt-dll $<STREQUAL:${msvc-rt},MultiThreadedDLL>)
 
-set(backport-msvc-runtime $<VERSION_LESS:${CMAKE_VERSION},3.15>)
-
 add_library(yaml-cpp ${yaml-cpp-type} "")
 add_library(yaml-cpp::yaml-cpp ALIAS yaml-cpp)
 
@@ -117,11 +107,6 @@ endif()
 
 target_compile_options(yaml-cpp
   PRIVATE
-    $<$<AND:${backport-msvc-runtime},${msvc-rt-mtd-static}>:-MTd>
-    $<$<AND:${backport-msvc-runtime},${msvc-rt-mt-static}>:-MT>
-    $<$<AND:${backport-msvc-runtime},${msvc-rt-mtd-dll}>:-MDd>
-    $<$<AND:${backport-msvc-runtime},${msvc-rt-mt-dll}>:-MD>
-
     # /wd4127 = disable warning C4127 "conditional expression is constant"
     # http://msdn.microsoft.com/en-us/library/6t66728h.aspx
     # /wd4355 = disable warning C4355 "'this' : used in base member initializer list

test/CMakeLists.txt

@@ -18,10 +18,8 @@ endif()
 
 set(test-new-api-pattern "new-api/*.cpp")
 set(test-source-pattern "*.cpp" "integration/*.cpp" "node/*.cpp")
-if (CMAKE_VERSION VERSION_GREATER 3.11)
-  list(INSERT test-new-api-pattern 0 CONFIGURE_DEPENDS)
-  list(INSERT test-source-pattern 0 CONFIGURE_DEPENDS)
-endif()
+list(INSERT test-new-api-pattern 0 CONFIGURE_DEPENDS)
+list(INSERT test-source-pattern 0 CONFIGURE_DEPENDS)
 
 file(GLOB test-new-api-sources ${test-new-api-pattern})
 file(GLOB test-sources ${test-source-pattern})