On Fri, Jul 24, 2020 at 2:58 PM '[email protected]' via
emscripten-discuss <[email protected]> wrote:
> Hello!
>
> I’m experimenting with converting an existing project here to
> WebAssembly. This project has several modules, each with its own library
> and test executable. My current approach, just to see if I can get things
> running, is to build those test executables using the default emscripten
> shell.html file. That process has been successful so far, except when I
> try to add a binding via embind. Trying to “link” in the generated .js
> file with --post-js results in a runtime error apparently before any of the
> project code is run: “Module.arguments has been replaced with plain
> arguments_ (the initial value can be provided on Module, but after startup
> the value is only looked for on a local variable of that name)”
>
> I have this relevant section of my CMakeLists file:
>
> add_custom_command(OUTPUT Utils-bindings.js
>
> COMMAND
>
> ${CMAKE_CXX_COMPILER}
>
> --bind
>
> “${CMAKE_CURRENT_SOURCE_DIR}/base/emscripten.cc”
>
> -o
>
> Utils-bindings.js
>
> DEPENDS
>
> “${CMAKE_CURRENT_SOURCE_DIR}/base/emscripten.cc”
>
> )
>
> target_link_options(${Utils_TEST} PUBLIC --bind --post-js
> Utils-bindings.js)
>
>
>
> Which generates these commands:
>
> em++ --bind base/emscripten.cc -o Utils-bindings.js
>
You probably want to use `-c` here to compile `base/emscripten.cc` into an
object file, and the link that object file into your final binary.
Otherwise you are asking emscripten to produce a filly linked program here,
that that cannot be combined into another emscripten program.
>
>
em++ -s DISABLE_EXCEPTION_CATCHING=2 -s WASM=1 -s SAFE_HEAP=1 -s
> WARN_UNALIGNED=1 -fsanitize=undefined -Oz -s ASSERTIONS=1 -s
> DEMANGLE_SUPPORT=1 -g -Wall -fno-omit-frame-pointer -m32 --bind --post-js
> Utils-bindings.js @CMakeFiles/Utils-test_g.dir/objects1.rsp -o
> Utils-test_g.html @CMakeFiles/Utils-test_g.dir/linklibs.rsp
>
> Loading Utils-test_g.html in a browser produces the error. I’ve tried all
> of the --(extern-)?(pre|post)-js permutations without success. I’m well
> out of my depth and have been trying whatever I can find at this point.
> How do I get these library bindings “linked” into the “executable”?
>
> Thanks!
>
> ~Michael Iatauro
>
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