Support shared build for xeus-cpp-lite

Author: anutosh491

CMakeLists.txt

@@ -9,6 +9,17 @@
 cmake_minimum_required(VERSION 3.8)
 project(xwidgets)
 
+if(EMSCRIPTEN)
+    set_property(GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS TRUE)
+    set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-s SIDE_MODULE=1")
+    set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-s SIDE_MODULE=1")
+    set(CMAKE_STRIP FALSE)
+
+    # Define the path to the shared library for use with CppInterOp dynamic loading
+    set(XWIDGETS_CPPINTEROP_LIBRARY_PATH "\"/lib/${CMAKE_SHARED_LIBRARY_PREFIX}xwidgets${CMAKE_SHARED_LIBRARY_SUFFIX}\"")
+    message(STATUS "XWIDGETS_CPPINTEROP_LIBRARY_PATH = ${XWIDGETS_CPPINTEROP_LIBRARY_PATH}")
+endif()
+
 set(XWIDGETS_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
 set(XWIDGETS_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
 
@@ -157,6 +168,9 @@ macro(xwidgets_create_target target_name linkage output_name)
     )
 
     target_link_libraries(${target_name} PUBLIC ${XEUS_TARGET_NAME} xproperty)
+    if(EMSCRIPTEN)
+        set_target_properties(${target_name} PROPERTIES NO_SONAME 1)
+    endif()
 
     set_target_properties(
         ${target_name}
@@ -182,7 +196,11 @@ macro(xwidgets_create_target target_name linkage output_name)
         OR CMAKE_CXX_COMPILER_ID MATCHES "GNU"
         OR CMAKE_CXX_COMPILER_ID MATCHES "Intel"
     )
-        target_compile_options(${target_name} PUBLIC -Wunused-parameter -Wextra -Wreorder)
+        if(EMSCRIPTEN)
+            target_compile_options(${target_name} PRIVATE -fPIC)
+        else ()
+            target_compile_options(${target_name} PUBLIC -Wunused-parameter -Wextra -Wreorder)
+        endif()
 
         message(STATUS "CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
     endif()

include/xwidgets/xwidgets_config.hpp

@@ -106,4 +106,8 @@
 #include "xwidgets_config_cling.hpp"
 #endif
 
+#if defined(__CLANG_REPL__) && defined(__EMSCRIPTEN__)
+#include "xwidgets_config_cling.hpp"
+#endif
+
 #endif

include/xwidgets/xwidgets_config_cling.hpp.in

@@ -9,7 +9,19 @@
 #ifndef XWIDGETS_CONFIG_CLING_HPP
 #define XWIDGETS_CONFIG_CLING_HPP
 
+#ifdef __CLING__
+
 #pragma cling add_library_path(@XWIDGETS_INSTALL_LIBRARY_DIR@)
 #pragma cling load("libxwidgets")
 
+#elif defined(__EMSCRIPTEN__) && defined(__CLANG_REPL__)
+
+#include <clang/Interpreter/CppInterOp.h>
+static bool _xwidgets_loaded = []() {
+    Cpp::LoadLibrary(@XWIDGETS_CPPINTEROP_LIBRARY_PATH@, false);
+    return true;
+}();
+
 #endif
+
+#endif // XWIDGETS_CONFIG_CLING_HPP