Enable pthreads in wasm build

Author: Grant Karapetyan

CMakeLists.txt

@@ -86,7 +86,9 @@ IF(MR_EMSCRIPTEN)
   include_directories(${MESHLIB_THIRDPARTY_INCLUDE_DIR}/googletest/googletest/include)
   include_directories(${MESHLIB_THIRDPARTY_INCLUDE_DIR}/libzip/lib)
   include_directories(${THIRDPARTY_LIB_DIR}/libzip)
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -s ALLOW_MEMORY_GROWTH=1")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-pthreads-mem-growth") # look https://github.com/emscripten-core/emscripten/issues/8287
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread -s PTHREAD_POOL_SIZE_STRICT=0 -s ALLOW_MEMORY_GROWTH=1")
 ENDIF() # MR_EMSCRIPTEN
 
 enable_testing()

thirdparty/CMakeLists.txt

@@ -13,6 +13,11 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-sign-compare -Wno-unknown-pra
        -Wno-unused-function -Wno-unused-variable -Wno-comment -Wno-parentheses -Wno-int-in-bool-context -Wno-strict-aliasing")
 # -Werror")
 
+IF(MR_EMSCRIPTEN)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
+ENDIF()
+
 IF(APPLE OR MR_EMSCRIPTEN)
  add_subdirectory(./expected ./expected)
 ELSE()