module: Re-implement using library constructors/destructors (#2018)

By using constructors/destructors we unify the case of static linking with
that of dynamic linking, and we reuse the build flag FEATURE_INIT_FINI. Using
constructors/destructors also allows us to cover the case where library
constructor/destructor functionality is unavailable, because we can expose the
module registration/unregistration functions as global symbols, to be called
explicitly from within the application.

Fixes https://github.com/jerryscript-project/jerryscript/issues/1952

JerryScript-DCO-1.0-Signed-off-by: Gabriel Schulhof gabriel.schulhof@intel.com

jerry-ext/CMakeLists.txt

@@ -19,6 +19,10 @@ project (${JERRY_EXT_NAME} C)
 # Include directories
 set(INCLUDE_EXT "${CMAKE_CURRENT_SOURCE_DIR}/include")
 
+if(FEATURE_INIT_FINI)
+  set(DEFINES_EXT ${DEFINES_EXT} ENABLE_INIT_FINI)
+endif()
+
 # Source directories
 file(GLOB SOURCE_EXT_ARG      arg/*.c)
 file(GLOB SOURCE_EXT_MODULE   module/*.c)
@@ -32,7 +36,7 @@ set(SOURCE_EXT
 add_library(${JERRY_EXT_NAME} STATIC ${SOURCE_EXT})
 
 target_include_directories(${JERRY_EXT_NAME} PUBLIC ${INCLUDE_EXT})
-
+target_compile_definitions(${JERRY_EXT_NAME} PUBLIC ${DEFINES_EXT})
 target_link_libraries(${JERRY_EXT_NAME} jerry-core)
 
 install(TARGETS ${JERRY_EXT_NAME} DESTINATION lib)