fix initialization of CMakeLists and cleanup after bump of min cmake version

build/cmake/CMakeLists.txt

@@ -1,25 +1,12 @@
+cmake_minimum_required(VERSION 3.16)
+project(glew LANGUAGES C)
+
 if ( NOT DEFINED CMAKE_BUILD_TYPE )
   set( CMAKE_BUILD_TYPE Release CACHE STRING "Build type" )
 endif ()
 
-project (glew C)
-
-cmake_minimum_required (VERSION 3.16)
-
 include(GNUInstallDirs)
 
-if(POLICY CMP0003)
-  cmake_policy (SET CMP0003 NEW)
-endif()
-
-if(POLICY CMP0042)
-  cmake_policy (SET CMP0042 NEW)
-endif()
-
-if (POLICY CMP0072)
-  cmake_policy (SET CMP0072 NEW)
-endif(POLICY CMP0072)
-
 set(CMAKE_DEBUG_POSTFIX d)
 
 option (BUILD_UTILS "utilities" ON)
@@ -51,14 +38,6 @@ endif()
 
 find_package (OpenGL REQUIRED)
 
-# cmake<3.10 doesn't detect EGL/GLX
-if (CMAKE_VERSION VERSION_LESS 3.10)
-  find_library(OPENGL_egl_LIBRARY NAMES EGL)
-  if (OPENGL_egl_LIBRARY)
-    set (OpenGL_EGL_FOUND TRUE)
-  endif ()
-endif ()
-
 # prefer GLVND
 if (OPENGL_opengl_LIBRARY)
   set (GLEW_LIBRARIES ${OPENGL_opengl_LIBRARY})
@@ -178,15 +157,11 @@ endif()
 target_link_libraries (glew LINK_PUBLIC ${GLEW_LIBRARIES})
 target_link_libraries (glew_s ${GLEW_LIBRARIES})
 
-if(CMAKE_VERSION VERSION_LESS 2.8.12)
-  set(MAYBE_EXPORT "")
-else()
 target_compile_definitions(glew_s INTERFACE "GLEW_STATIC")
 foreach(t glew glew_s)
   target_include_directories(${t} PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 endforeach()
 set(MAYBE_EXPORT EXPORT glew-targets)
-endif()
 
 set(targets_to_install "")
 if(BUILD_SHARED_LIBS)
@@ -258,7 +233,7 @@ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/glew.pc
         COMPONENT Development
 )
 
-if(WIN32 AND MSVC AND (NOT MSVC_VERSION LESS 1600) AND (NOT CMAKE_VERSION VERSION_LESS "3.1"))
+if(WIN32 AND MSVC AND (NOT MSVC_VERSION LESS 1600))
     install(
         FILES $<TARGET_PDB_FILE:glew>
         DESTINATION ${CMAKE_INSTALL_LIBDIR}

build/cmake/testbuild/CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required(VERSION 2.8.12)
-project(glew-cmake-test)
+cmake_minimum_required(VERSION 3.16)
+project(glew-cmake-test LANGUAGES C)
 
 find_package(GLEW REQUIRED CONFIG)
 find_package(GLEW REQUIRED CONFIG) # call twice to test multiple call
@@ -10,14 +10,8 @@ set_target_properties(cmake-test PROPERTIES DEBUG_POSTFIX _d)
 target_link_libraries(cmake-test PRIVATE GLEW::GLEW ${OPENGL_LIBRARIES})
 target_include_directories(cmake-test PRIVATE ${OPENGL_INCLUDE_DIR})
 
-if(CMAKE_VERSION VERSION_LESS 3.0)
-    set(cgex $<CONFIGURATION>)
-else()
-    set(cgex $<CONFIG>)
-endif()
-
 target_compile_definitions(cmake-test PRIVATE
-    -DGLEW_CMAKE_TEST_CONFIG=${cgex}
+    -DGLEW_CMAKE_TEST_CONFIG=$<CONFIG>
     -DGLEW_CMAKE_TEST_TARGET_FILE_NAME=$<TARGET_FILE_NAME:GLEW::GLEW>
     -DGLEW_CMAKE_TEST_TARGET_TYPE=$<TARGET_PROPERTY:GLEW::GLEW,TYPE>
     )