Remove FindSDL2 find-module, use sdl2-config.cmake instead This requires SDL >= 2.0.4. Since <https://bugzilla.libsdl.org/show_bug.cgi?id=2464> was fixed in SDL 2.0.4, SDL behaves as a CMake "config-file package", even if it was not itself built using CMake: it installs a sdl2-config.cmake file to ${libdir}/cmake/SDL2, which tells CMake where to find SDL's headers and library, analogous to a pkg-config .pc file. As a result, we no longer need to copy/paste a "find-module package" to be able to find a system copy of SDL >= 2.0.4 with find_package(SDL2). Find-module packages are now discouraged by the CMake developers, in favour of having upstream projects behave as config-file packages. This results in a small API change: FindSDL2 used to set SDL2_INCLUDE_DIR and SDL2_LIBRARY, but the standard behaviour for config-file packages is to set <name>_INCLUDE_DIRS and <name>_LIBRARIES. Use the CONFIG keyword to make sure we search in config-file package mode, and will not find a FindSDL2.cmake in some other directory that implements the old interface. In addition to deleting redundant code, this avoids some assumptions in FindSDL2 about the layout of a SDL installation. The current libsdl2-dev package in Debian breaks those assumptions; this is considered a bug and will hopefully be fixed soon, but it illustrates how fragile these assumptions can be. We can be more robust against different installation layouts by relying on SDL's own CMake integration. When linking to a copy of CMake in a non-standard location, users can now set the SDL2_DIR or CMAKE_PREFIX_PATH environment variable to point to it; previously, these users would have used the SDL2DIR environment variable. This continues to be unnecessary if using matching system-wide installations of CMake and SDL2, for example both from Debian.

@echo off
setlocal
::CONFIG START
::edit these variables if necessary

::change between Debug and Release
set BUILD_TYPE=Release
::path where Hedgewars will be installed to
::default is %ProgramFiles%\hedgewars and requires running this script as administrator  
set INSTALL_LOCATION=
::set if vcpkg is not on path
set VCPKG_PATH=%VCPKG_ROOT%
::set if CMake is not on path
set CMAKE_PATH=
::set if FPC is not on path
set PASCAL_PATH=
::set to 1 if x86 to x64 cross-compiler is not enabled automatically
set FORCE_X64_CROSS_COMPILE=
::set to 1 to build the game server
set BUILD_SERVER=

::CONFIG END
            
:setup
set CURRDIR="%CD%"
cd %CURRDIR%\..\

set PATH=%PASCAL_PATH%;%VCPKG_PATH%;%CMAKE_PATH%;%PATH%

if "%VSCMD_ARG_TGT_ARCH%" == "x64" (
    set FORCE_X64_CROSS_COMPILE=1
)

if "%FORCE_X64_CROSS_COMPILE%" NEQ "" (
    set CROSS_COMPILE_FLAG=-DWIN32_WIN64_CROSS_COMPILE=1
    if "%INSTALL_LOCATION%" == "" (
        set INSTALL_LOCATION=%ProgramFiles%/hedgewars
    )
) else (
    set CROSS_COMPILE_FLAG=
)

if "%INSTALL_LOCATION%" NEQ "" (
    set PREFIX_FLAG=-DCMAKE_INSTALL_PREFIX=%INSTALL_LOCATION%
) else (
    set PREFIX_FLAG=
)

if "%BUILD_SERVER%" == "" (
    set BUILD_SERVER_FLAG=-DNOSERVER=1
) else (
    set BUILD_SERVER_FLAG=
)             

echo Running cmake...
set ERRORLEVEL=

cmake . -DCMAKE_TOOLCHAIN_FILE="%VCPKG_PATH%\scripts\buildsystems\vcpkg.cmake" -G"NMake Makefiles" %CROSS_COMPILE_FLAG% %BUILD_SERVER_FLAG% "%PREFIX_FLAG%" -DCMAKE_BUILD_TYPE="%BUILD_TYPE%" -DSDL2_BUILDING_LIBRARY=1

if %ERRORLEVEL% NEQ 0 goto exitpoint

echo Configuration completed successfully

echo Building...
set ERRORLEVEL=

nmake

if %ERRORLEVEL% NEQ 0 goto exitpoint

echo Build completed successfully

nmake install

:exitpoint
cd %CURRDIR%

endlocal
pause