cross-compiling from Linux to get an executable windows

[grafenocarbono]

Hello,

I am trying to compile from Linux a Windows executable.

I have create the following script:

sudo apt install mingw-w64 -y
mkdir build-win && cd build-win
cmake  \
  -DCMAKE_TOOLCHAIN_FILE=../mingw_toolchain.cmake \
  -DCMAKE_PREFIX_PATH=/path/to/Qt/6.x.x/mingw_64/lib/cmake

make```

My CMakeLists.txt is the following one:

```cmake_minimum_required(VERSION 3.16)

project(hello_world LANGUAGES CXX)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Core)

set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
set(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)


add_executable(hello_world
  main.cpp
)
target_link_libraries(hello_world Qt${QT_VERSION_MAJOR}::Core)

include(GNUInstallDirs)
install(TARGETS hello_world
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

When I execute my script I get the following error:

  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


CMake Error: The source directory "/home/leyva/QtProjects/hello_world/build-win" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
make: *** No targets specified and no makefile found.  Stop.

Thanks in advance.

[Christian Ehrlicher]

As the error message tells you, you forgot to specify the source directory.