OpenTTD-patches/os/emscripten/cmake/FindLibLZMA.cmake
Patric Stout d15dc9f40f Add: support for emscripten (play-OpenTTD-in-the-browser)
Emscripten compiles to WASM, which can be loaded via
HTML / JavaScript. This allows you to play OpenTTD inside a
browser.

Co-authored-by: milek7 <me@milek7.pl>
2020-12-15 15:46:39 +01:00

21 lines
806 B
CMake

# LibLZMA is a recent addition to the emscripten SDK, so it is possible
# someone hasn't updated his SDK yet. Test out if the SDK supports LibLZMA.
include(CheckCXXSourceCompiles)
set(CMAKE_REQUIRED_FLAGS "-sUSE_LIBLZMA=1")
check_cxx_source_compiles("
#include <lzma.h>
int main() { return 0; }"
LIBLZMA_FOUND
)
if (LIBLZMA_FOUND)
add_library(LibLZMA::LibLZMA INTERFACE IMPORTED)
set_target_properties(LibLZMA::LibLZMA PROPERTIES
INTERFACE_COMPILE_OPTIONS "-sUSE_LIBLZMA=1"
INTERFACE_LINK_LIBRARIES "-sUSE_LIBLZMA=1"
)
else()
message(WARNING "You are using an emscripten SDK without LibLZMA support. Many savegames won't be able to load in OpenTTD. Please apply 'emsdk-liblzma.patch' to your local emsdk installation.")
endif()