Fix cmake initialization regarding policy configuration

Author: scheibel

CMakeLists.txt

@@ -6,8 +6,20 @@
 # CMake version
 cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
 
-# Include cmake modules
+#
+# Configure CMake environment
+#
+
+# Register general cmake commands
+include(cmake/Custom.cmake)
 
+# Set policies
+set_policy(CMP0028 NEW) # ENABLE CMP0028: Double colon in target name means ALIAS or IMPORTED target.
+set_policy(CMP0054 NEW) # ENABLE CMP0054: Only interpret if() arguments as variables or keywords when unquoted.
+set_policy(CMP0042 NEW) # ENABLE CMP0042: MACOSX_RPATH is enabled by default.
+set_policy(CMP0063 NEW) # ENABLE CMP0063: Honor visibility properties for all target types.
+
+# Include cmake modules
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
 include(GenerateExportHeader)
@@ -19,15 +31,10 @@ if (${CMAKE_VERSION} VERSION_GREATER "3.2")
     include(WriteCompilerDetectionHeader OPTIONAL RESULT_VARIABLE WriterCompilerDetectionHeaderFound)
 endif()
 
+# Include custom cmake modules
 include(cmake/GetGitRevisionDescription.cmake)
-include(cmake/Custom.cmake)
 include(cmake/HealthCheck.cmake)
-
-# Set policies
-set_policy(CMP0028 NEW) # ENABLE CMP0028: Double colon in target name means ALIAS or IMPORTED target.
-set_policy(CMP0054 NEW) # ENABLE CMP0054: Only interpret if() arguments as variables or keywords when unquoted.
-set_policy(CMP0042 NEW) # ENABLE CMP0042: MACOSX_RPATH is enabled by default.
-set_policy(CMP0063 NEW) # ENABLE CMP0063: Honor visibility properties for all target types.
+include(cmake/GenerateTemplateExportHeader.cmake)
 
 
 # 

cmake/Custom.cmake

@@ -44,16 +44,3 @@ function(list_extract OUTPUT REGEX)
     set(${OUTPUT} ${${OUTPUT}} PARENT_SCOPE)
 
 endfunction(list_extract)
-
-
-# Creates an export header similar to generate_export_header, but for templates.
-# The main difference is that for MSVC, templates must not get exported.
-# When the file ${export_file} is included in source code, the macro ${target_id}_TEMPLATE_API
-# may get used to define public visibility for templates on GCC and Clang platforms.
-function(generate_template_export_header target target_id export_file)
-    if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "MSVC")
-        configure_file(${PROJECT_SOURCE_DIR}/source/codegeneration/template_msvc_api.h.in ${CMAKE_CURRENT_BINARY_DIR}/${export_file})
-    else()
-        configure_file(${PROJECT_SOURCE_DIR}/source/codegeneration/template_api.h.in ${CMAKE_CURRENT_BINARY_DIR}/${export_file})
-    endif()
-endfunction()

cmake/GenerateTemplateExportHeader.cmake

@@ -0,0 +1,12 @@
+
+# Creates an export header similar to generate_export_header, but for templates.
+# The main difference is that for MSVC, templates must not get exported.
+# When the file ${export_file} is included in source code, the macro ${target_id}_TEMPLATE_API
+# may get used to define public visibility for templates on GCC and Clang platforms.
+function(generate_template_export_header target target_id export_file)
+    if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "MSVC")
+        configure_file(${PROJECT_SOURCE_DIR}/source/codegeneration/template_msvc_api.h.in ${CMAKE_CURRENT_BINARY_DIR}/${export_file})
+    else()
+        configure_file(${PROJECT_SOURCE_DIR}/source/codegeneration/template_api.h.in ${CMAKE_CURRENT_BINARY_DIR}/${export_file})
+    endif()
+endfunction()