Wasm is not linking

[nekomiya-kasane]

Here is the minimal case:

set_project("GS")
set_version("1.0.0", {build = "%Y%m%d%H%M"})
set_xmakever("2.7.0")

rules = {
    "mode.debug", 
    "mode.releasedbg", 
}

add_rules(unpack(rules))

set_languages("c++17")

target("wasmBinding") do 
    set_kind("static")

    --add_syslinks("embind")
    add_ldflags("-lembind")
    
    set_extension(".wasm")

    add_ldflags('-sWASM=1', '-sFULL_ES2', '-sFULL_ES3', { public = true })

    add_includedirs("D:/scoop_global/persist/emscripten/upstream/emscripten/system/include")
    add_files("next.cpp")
end

There's only 2 enum definitions in next.cpp:

#include <emscripten/bind.h>

using namespace emscripten;
enum OldStyle {
    OLD_STYLE_ONE,
    OLD_STYLE_TWO
};

enum class NewStyle {
    ONE,
    TWO
};

EMSCRIPTEN_BINDINGS(my_enum_example) {
    enum_<OldStyle>("OldStyle")
        .value("ONE", OLD_STYLE_ONE)
        .value("TWO", OLD_STYLE_TWO)
        ;
    enum_<NewStyle>("NewStyle")
        .value("ONE", NewStyle::ONE)
        .value("TWO", NewStyle::TWO)
        ;
}

When I exec xmake, it gives

 xmake --verbose
checking for emcc.bat ... D:\scoop_global\apps\emscripten\3.1.39\upstream\emscripten\emcc.bat
checking for the c++ compiler (cxx) ... emcc.bat
checking for D:\scoop_global\apps\emscripten\3.1.39\upstream\emscripten\emcc.bat ... ok
checking for flags (-fPIC) ... ok
checking for flags (-fvisibility-inlines-hidden) ... ok
checking for flags (-O3) ... ok
checking for flags (-DNDEBUG) ... ok
[ 25%]: cache compiling.release next.cpp
D:\scoop_global\apps\emscripten\3.1.39\upstream\emscripten\emcc.bat -c -fvisibility=hidden -fvisibility-inlines-hidden -O3 -std=c++17 -ID:\scoop_global\persist\emscripten\upstream\emscripten\system\include -DNDEBUG -o build\.objs\wasmBinding\wasm\x64\release\next.cpp.o next.cpp
checking for flags (-MMD -MF) ... ok
checking for flags (-fdiagnostics-color=always) ... ok
checking for emcc.bat ... D:\scoop_global\apps\emscripten\3.1.39\upstream\emscripten\emcc.bat
checking for the c compiler (cc) ... emcc.bat
checking for flags (-fPIC) ... ok
checking for flags (-fdiagnostics-color=always) ... ok
checking for emar.bat ... D:\scoop_global\apps\emscripten\3.1.39\upstream\emscripten\emar.bat
checking for the static library archiver (ar) ... emar.bat
[ 50%]: archiving.release libwasmBinding.wasm
D:\scoop_global\apps\emscripten\3.1.39\upstream\emscripten\emar.bat -cr build\wasm\x64\release\libwasmBinding.wasm build\.objs\wasmBinding\wasm\x64\release\next.cpp.o    
[100%]: build ok, spent 3.937s

It calls emcc with -c option, then emar, obviously the output is not linked. I wonder how to resolve such problems?

[waruqi]

What do you want to link? Static libraries need not to be linked, only dynamic libraries and executables need to be linked.

https://xmake.io/#/guide/project_examples?id=wasm-programs