C++ cross compile WxWidgets with MXE using CMAKE - c++

Question

I am trying to make a CMAKE file that allows me to cross compile a WxWidgets application From Ubuntu For Windows.
My tools are all installed correctly, and I am able to run:
i686-w64-mingw32.static-gcc main.cpp $(i686-w64-mingw32.static-wx-config --cxxflags --libs) -o main.exe -std=c++11 -lstdc++
and produce a working output.
But I have been unsuccessful in finding a way to convert this into a CMAKE file. Does anyone have any resources or even examples of a working example?
Here is an example of my non-working file:
cmake_minimum_required(VERSION 3.11)
SET (PROJECT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
SET(PROJECT_NAME "WxWidgets")
SET(CMAKE_C_COMPILER i686-w64-mingw32.static)
project(
${PROJECT_NAME}
VERSION 1.0
LANGUAGES CXX)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} (i686-w64-mingw32.static-wx-config --cxxflags --libs) -L /home/kevin/wxWidgets/include/ -Wall -std=gnu++2a -static -g")
file(GLOB all_SRCS
"${PROJECT_SOURCE_DIR}/src/*.h"
"${PROJECT_SOURCE_DIR}/src/*.hpp"
"${PROJECT_SOURCE_DIR}/src/*.c"
"${PROJECT_SOURCE_DIR}/src/*.cpp"
"${PROJECT_SOURCE_DIR}/src/**/*.c"
"${PROJECT_SOURCE_DIR}/src/**/*.cpp"
"${PROJECT_SOURCE_DIR}/src/**/*.hpp"
)
add_executable(${PROJECT_NAME} ${all_SRCS})
I am running the command:
i686-w64-mingw32.static-cmake ..
within my build directory.
By removing:
**(i686-w64-mingw32.static-wx-config --cxxflags --libs) -L /home/kevin/wxWidgets/include/**
...I am getting the error:
fatal error: wx/wxprec.h: No such file or directory
8 | #include "wx/wxprec.h"
I have this file I checked with locate:
$ locate wx/wxprec.h
/home/kevin/mxe/usr/i686-w64-mingw32.static/include/wx-3.1/wx/wxprec.h
/home/kevin/wxWidgets/include/wx/wxprec.h
/usr/local/include/wx-3.3/wx/wxprec.h
EDIT:
Thanks to #vre's comment, I have updated my CMakeLists.txt file and have moved closer, it seems now that I just need to link correctly Here is what I have:
cmake_minimum_required(VERSION 3.11)
SET (PROJECT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
SET(PROJECT_NAME "WxWidgets")
SET(CMAKE_C_COMPILER i686-w64-mingw32.static)
project(
${PROJECT_NAME}
VERSION 1.0)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=gnu++2a -static -g")
file(GLOB all_SRCS
"${PROJECT_SOURCE_DIR}/src/*.h"
"${PROJECT_SOURCE_DIR}/src/*.hpp"
"${PROJECT_SOURCE_DIR}/src/*.c"
"${PROJECT_SOURCE_DIR}/src/*.cpp"
"${PROJECT_SOURCE_DIR}/src/**/*.c"
"${PROJECT_SOURCE_DIR}/src/**/*.cpp"
"${PROJECT_SOURCE_DIR}/src/**/*.hpp"
)
add_executable(${PROJECT_NAME} ${all_SRCS})
include( "${wxWidgets_USE_FILE}" )
find_package(wxWidgets REQUIRED)
target_include_directories(${PROJECT_NAME} PUBLIC /home/kevin/mxe/usr/i686-w64-mingw32.static/include/wx-3.1/ /home/kevin/mxe/usr/i686-w64-mingw32.static/lib/wx/include/i686-w64-mingw32.static-msw-unicode-static-3.1/)
target_link_directories(${PROJECT_NAME} PRIVATE /home/kevin/mxe/usr/i686-w64-mingw32.static/lib/)
But sadly, I have many linker errors such as:
undefined reference to `wxFrame::GetDefaultIcon() const'