Ok, I figured it out. Just missed this in the documentation the first time
through:
https://emscripten.org/docs/getting_started/FAQ.html#faq-when-safe-to-call-compiled-functions
On Thursday, February 7, 2019 at 5:25:29 PM UTC-7, Rick Battagline wrote:
>
> I'm trying to use Module.cwrap inside a new shell html file I'm calling
> new_shell.html.
>
> Inside this shell I added the following after the {{{ SCRIPT }}} line:
> <script type='text/javascript'>
> console.log("before cwrap");
> var test = Module.cwrap('test', 'undefined');
> console.log("after cwrap");
> test();
> </script>
>
>
> I have a pretty simple shell.c file:
> #include <emscripten.h>
> #include <stdlib.h>
>
> int main() {
> printf("hello world\n");
> }
>
> void test() {
> printf("button test\n");
> }
>
>
> I've tried several variations on emcc, but always get the same error that
> says that Module.cwrap is not a function. Here's what I ran the most
> recent time that resulted in the Module.cwrap is not a function error:
>
> emcc shell.c -o shell-test.html --emrun --shell-file new_shell.html -s
> NO_EXIT_RUNTIME=1 -s EXPORTED_FUNCTIONS="['_test', '_main']" -s
> EXTRA_EXPORTED_RUNTIME_METHODS="['cwrap', 'ccall']"
>
> I've seen posts that recommended changes to the quotes around
> EXTRA_EXPORTED_RUNTIME_METHODS, and I've tried many variations but nothing
> seems to work.
>
> Looking through the javascript file this generated "shell-test.js" it
> looks to me like as long as my script runs after this file is included the
> Module.cwrap should be there. There is a line in that file:
> Module["cwrap"] = cwrap;
>
>
> I would think that this would set the cwrap function and that it would be
> available immediately after the shell-test.js is loaded, but that doesn't
> seem to be the case.
>
> When does cwrap become available for use?
>
> Thanks
>
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