I have the following problem. I want to create a cross-platform GUI application that uses wxWidgets I am trying to compile and run a "Hello World" example from wxWidgets web site. I want to use cmake to build the project. On Linux everything works without problems, but on Windows I see the following linking error
MSVCRTD.lib(exe_main.obj) : error LNK2019: unresolved external symbol main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)
It looks like the linker is looking for main function for some reason (shouldn't it look for WinMain?)
The example code has wxIMPLEMENT_APP(MyApp); macro, I have also set the linker option
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /subsystem:windows"), but nothing helps, so I don't understand what is the problem. I have a feeling that I missed something simple. May be you had a similar problem before with one of your projects? Thank you for your help.
My CMakeLists.txt file is given below
cmake_minimum_required (VERSION 3.8)
project ("project")
set(CMAKE_CXX_STANDARD 17)
set(WXWIN "C:/msys64/wxWidgets")
# =========================================================================
set(BUILD_DEPS ON)
list(APPEND CMAKE_MODULE_PATH "include/libs")
include_directories("include/libs")
add_subdirectory("include/libs/glog")
if (MSVC)
set(wxWidgets_ROOT_DIR ${WXWIN})
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /subsystem:windows")
endif (MSVC)
find_package(wxWidgets COMPONENTS net gl core base)
include(${wxWidgets_USE_FILE})
set(wxWidgets_USE_UNICODE ON)
# Create shared library for the project
set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
set(PROJECT_LINK_LIBS Tools)
set(LIBRARY_SRC include/Tools.cpp)
add_library(Tools SHARED ${LIBRARY_SRC})
link_directories("out/build")
set_target_properties(Tools PROPERTIES POSITION_INDEPENDENT_CODE 1)
# =========================================================================
# Add source to this project's executable.
add_executable (project "project.cpp" "project.h")
target_compile_features(project PUBLIC cxx_std_17)
target_link_libraries (project ${PROJECT_LINK_LIBS} ${wxWidgets_LIBRARIES})
