os/emscripten/cmake/FindLibLZMA.cmake

   1 # LibLZMA is a custom addition to the emscripten SDK, so it is possible
   2 # someone patched their SDK. Test out if the SDK supports LibLZMA.
   3 include(CheckCXXSourceCompiles)
   4 set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
   5 set(CMAKE_REQUIRED_FLAGS "--use-port=contrib.liblzma")
   6
   7 check_cxx_source_compiles("
   8     #include <lzma.h>
   9     int main() { return 0; }"
  10     LIBLZMA_FOUND
  11 )
  12
  13 if (LIBLZMA_FOUND)
  14         add_library(LibLZMA::LibLZMA INTERFACE IMPORTED)
  15         set_target_properties(LibLZMA::LibLZMA PROPERTIES
  16                 INTERFACE_COMPILE_OPTIONS "--use-port=contrib.liblzma"
  17                 INTERFACE_LINK_LIBRARIES "--use-port=contrib.liblzma"
  18         )
  19 else()
  20         message(WARNING "You are using an emscripten SDK without LibLZMA support. Many savegames won't be able to load in OpenTTD. Please copy liblzma.py to your ports/contrib folder in your local emsdk installation.")
  21 endif()
  22
  23 set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})