Merge pull request #4128 from openscad/wasm-update

Add flags for WASM compilation.

CMakeLists.txt

@@ -53,6 +53,7 @@ option(EXPERIMENTAL "Enable Experimental Features" OFF)
 option(SNAPSHOT "Create dev snapshot, uses nightly icons" OFF)
 option(HEADLESS "Build without GUI frontend" OFF)
 option(ENABLE_EGL "Enable EGL instead of GLX support if available" OFF)
+option(WASM "Build WebAssembly, (implies NULLGL=ON) " OFF)
 option(NULLGL "Build without OpenGL, (implies HEADLESS=ON) " OFF)
 option(IDPREFIX "Prefix CSG nodes with index # (debugging purposes only, will break node cache)" OFF)
 option(PROFILE "Enable compiling with profiling / test coverage instrumentation" OFF)
@@ -77,7 +78,14 @@ if(PROFILE)
   SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${GCC_COVERAGE_LINK_FLAGS}")
 endif()
 
-if (NULLGL)
+if(WASM)
+  set(NULLGL ON)
+  set(ENV{PKG_CONFIG_PATH} "/emsdk/upstream/emscripten/cache/sysroot/lib/pkgconfig")
+  target_compile_options(OpenSCAD PRIVATE "-pthread")
+  target_compile_definitions(OpenSCAD PRIVATE CGAL_DISABLE_ROUNDING_MATH_CHECK)
+endif()
+
+if(NULLGL)
   set(HEADLESS ON)
 endif()
 if(EXPERIMENTAL)