libwebp.diff

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a1ea7450c..a9f07c887 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -565,6 +565,22 @@ if(WEBP_BUILD_GIF2WEBP)
   parse_makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "GIF2WEBP_SRCS"
                     "gif2webp")
   add_executable(gif2webp ${GIF2WEBP_SRCS})
+  set_target_properties(gif2webp PROPERTIES LINK_FLAGS "-s WASM=1 \
+  -s STRICT=1 \
+  -s ASSERTIONS=1 \
+  -s EXPORT_ES6=1 \
+  -s FILESYSTEM=1 \
+  -s INVOKE_RUN=0 \
+  -s MODULARIZE=1 \
+  -s MAIN_MODULE=2 \
+  -s EXIT_RUNTIME=0 \
+  -s ENVIRONMENT='web' \
+  -s ALLOW_MEMORY_GROWTH=1 \
+  -s ERROR_ON_UNDEFINED_SYMBOLS=0 \
+  -s EXPORT_NAME=loadGif2WebpWasm \
+  -s INCOMING_MODULE_JS_API=['locateFile'] \
+  -s EXPORTED_FUNCTIONS='[\"_main\",\"_malloc\",\"_DGifCloseFile\",\"_DGifGetExtension\",\"_DGifGetExtensionNext\",\"_DGifGetImageDesc\",\"_DGifGetLine\",\"_DGifGetRecordType\",\"_DGifOpenFileHandle\",\"_DGifOpenFileName\",\"_GifErrorString\"]' \
+  -s EXPORTED_RUNTIME_METHODS='[\"ccall\",\"cwrap\",\"FS\",\"stringToUTF8\",\"lengthBytesUTF8\",\"setValue\"]'")
   target_link_libraries(gif2webp exampleutil imageioutil webp libwebpmux
                         ${WEBP_DEP_GIF_LIBRARIES})
   target_include_directories(gif2webp PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/src)