Enable C++17 and C99

- closes https://github.com/assimp/assimp/issues/4257

CMakeLists.txt

@@ -56,7 +56,7 @@ IF(ASSIMP_HUNTER_ENABLED)
   add_definitions(-DASSIMP_USE_HUNTER)
 ENDIF()
 
-PROJECT(Assimp VERSION 5.1.4)
+PROJECT(Assimp VERSION 5.1.3)
 
 # All supported options ###############################################
 
@@ -182,8 +182,8 @@ SET (ASSIMP_SOVERSION 5)
 
 SET( ASSIMP_PACKAGE_VERSION "0" CACHE STRING "the package-specific version used for uploading the sources" )
 if(NOT ASSIMP_HUNTER_ENABLED)
-  # Enable C++11 support globally
-  set(CMAKE_CXX_STANDARD 11)
+  # Enable C++17 support globally
+  set(CMAKE_CXX_STANDARD 17)
   set(CMAKE_CXX_STANDARD_REQUIRED ON)
   set(CMAKE_C_STANDARD 99)
 endif()

code/AssetLib/X3D/X3DImporter.cpp

@@ -480,6 +480,6 @@ void X3DImporter::ParseHelper_Node_Exit() {
     }
 }
 
-} // namespace Assimp
-
 #endif // !ASSIMP_BUILD_NO_X3D_IMPORTER
+
+} // namespace Assimp

code/CMakeLists.txt

@@ -1172,7 +1172,7 @@ ELSE()
 ENDIF()
 
 # adds C_FLAGS required to compile zip.c on old GCC 4.x compiler
-TARGET_COMPILE_FEATURES(assimp PRIVATE c_std_99)
+TARGET_COMPILE_FEATURES(assimp PUBLIC c_std_99)
 
 TARGET_INCLUDE_DIRECTORIES ( assimp PUBLIC
   $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>