Trouble making custom build: ccall not exporting

[evanhackett]

I'm having trouble with the enableOnDemandTableLoading due to a complex webpack setup inside a react native app. Since I only need a few tables max, it will be fine to embed the tables I need in a custom build. The problem I'm having with making a custom build is I'm getting an error saying the "ccall" method is not exporting, despite me adding "ccall" to the EXTRA_EXPORTED_RUNTIME_METHODS.

To start the process I ran the following command:

emcc ./liblouis/.libs/liblouis.a -s RESERVED_FUNCTION_POINTERS=1 -s MODULARIZE=1\
         -s EXPORT_NAME="'liblouisBuild'" -s EXTRA_EXPORTED_RUNTIME_METHODS="['FS',\
        'Runtime', 'stringToUTF16', 'Pointer_Stringify', 'ccall']" --pre-js ./liblouis-js/inc/pre.js\
         --post-js ./liblouis-js/inc/post.js -o build-embed-tables.js --embed-file ueb_tables

Notice 'ccall' is included as instructed. I then ran:

cat ./liblouis-js/inc/append.js >> build-embed-tables.js

I then moved the built files to the js-build folder:

mv build-embed-tables.js js-build
mv build-embed-tables.wasm js-build

Then, in the liblouis-js package folder, I ran:

npm link ../js-build --production

At this point I wanted to test my build, so I ran:

npm run test-node -- build-embed-tables.js

And here is where I got the error message:

> [email protected] test-node /Users/evan/dev/7apps/liblouis/liblouis-js
> node ./testrunner/node.js "build-embed-tables.js"

[INFO] EXECUTING TESTS IN NODEJS
[INFO] loaded testrunner
'ccall' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)
'ccall' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)
================================================================================
EXITING EARLY ON EXCEPTION
================================================================================
abort("'ccall' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)") at Error
    at jsStackTrace (/Users/evan/dev/7apps/liblouis/js-build/build-no-tables-utf16.js:1054:13)
    at stackTrace (/Users/evan/dev/7apps/liblouis/js-build/build-no-tables-utf16.js:1071:12)
    at abort (/Users/evan/dev/7apps/liblouis/js-build/build-no-tables-utf16.js:6386:44)
    at Object.Module.ccall (/Users/evan/dev/7apps/liblouis/js-build/build-no-tables-utf16.js:6126:54)
    at LiblouisEasyApi.charSize (/Users/evan/dev/7apps/liblouis/liblouis-js/easy-api.js:168:42)
    at LiblouisEasyApi.charSize (/Users/evan/dev/7apps/liblouis/liblouis-js/easy-api.js:484:24)
    at new LiblouisEasyApi (/Users/evan/dev/7apps/liblouis/liblouis-js/easy-api.js:469:18)
    at Object.<anonymous> (/Users/evan/dev/7apps/liblouis/liblouis-js/liblouis.js:2:16)
    at Module._compile (module.js:635:30)
    at Object.Module._extensions..js (module.js:646:10)
================================================================================
SUCCESS: 0      FAILURE: 1      EXCEPTION: YES      DID EARLY EXIT: YES
================================================================================

As you can see, I put 'ccall' in the compile command, so I'm not sure what is going on. I also tried getting my build file to work in the browser, just in case the tests use ccall and my use in the browser doesn't. Not surprisingly, I got the error in my console window:

'ccall' was not exported. add it to EXTRA_EXPORTED_RUNTIME_METHODS (see the FAQ)

I'm not sure what else to try at this point. I'm not sure if this is an issue with liblouis, liblouis-js, emscripten, or my setup. I'm hoping I just did something wrong.

Any help would be much appreciated.

Thanks!

[reiner-dolp]

ccall is a method of the emscripten runtime. See here. No need to export it.

You can look at the scripts we use to build liblouis/js-build automatically here. Our emscripten version is a year old, it might be that the emscripten CLI changed.

[reiner-dolp]

closing this since it's completely contained within #49. Also, no emcc version given to further investigate.