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Tasklist

FS#67443 - [emscripten] Missing JavaScript libraries error on optimization level -O2 and above

Attached to Project: Community Packages
Opened by Ho Tuan Kiet (tuankiet65) - Thursday, 30 July 2020, 11:34 GMT
Last edited by Sven-Hendrik Haase (Svenstaro) - Friday, 07 August 2020, 21:43 GMT
Task Type Bug Report
Category Packages
Status Closed
Assigned To Sven-Hendrik Haase (Svenstaro)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Invoking em++ to compile a simple C++ program with the -Os flag complains that a JavaScript library is missing:

tuankiet65:~/emscripten/ $ em++ -Os hello.cpp
shared:INFO: EM_IGNORE_SANITY set, ignoring sanity checks
em++: warning: unexpected binaryen version: 95 (expected 93) [-Wversion-check]
internal/modules/cjs/loader.js:1068
throw err;
^

Error: Cannot find module 'acorn'
Require stack:
- /usr/lib/emscripten/tools/acorn-optimizer.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:1065:15)
at Function.Module._load (internal/modules/cjs/loader.js:911:27)
at Module.require (internal/modules/cjs/loader.js:1125:19)
at require (internal/modules/cjs/helpers.js:75:18)
at Object.<anonymous> (/usr/lib/emscripten/tools/acorn-optimizer.js:1:13)
at Module._compile (internal/modules/cjs/loader.js:1236:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1257:10)
at Module.load (internal/modules/cjs/loader.js:1085:32)
at Function.Module._load (internal/modules/cjs/loader.js:950:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12) {
code: 'MODULE_NOT_FOUND',
requireStack: [ '/usr/lib/emscripten/tools/acorn-optimizer.js' ]
}
em++: error: '/usr/bin/node /usr/lib/emscripten/tools/acorn-optimizer.js /tmp/emscripten_temp_8pgwloxq/a.out.wasm.o.js AJSDCE minifyWhitespace' failed (1)

At optimization level -O2 and higher, tools/acorn-optimizer.js is used to optimize the output JavaScript file, however this tool depends on the acorn library which is not installed. I temporarily fixed it by manually installing the library using npm, however I think a permanent fix is to install the libraries by running "npm install" or "npm ci" in the tools/ directory. emscripten's formulae for Homebrew does something like that (https://github.com/Homebrew/homebrew-core/blob/master/Formula/emscripten.rb#L80). Emsdk also does invoke npm ci (https://github.com/emscripten-core/emsdk/blob/master/emsdk.py#L1226)
This task depends upon

Closed by  Sven-Hendrik Haase (Svenstaro)
Friday, 07 August 2020, 21:43 GMT
Reason for closing:  Fixed
Comment by Ho Tuan Kiet (tuankiet65) - Thursday, 30 July 2020, 11:37 GMT
Small edit: the "npm install" command should be run at the root emscripten directory (/usr/lib/emscripten), where the package.json file is.

Also using em++ to build a HTML file also fails on optimization level -O2 and above because the html-minifier-terser library was not found:
tuankiet65:~/emscripten/ $ em++ hello.cpp -o hello.html -Os
shared:INFO: EM_IGNORE_SANITY set, ignoring sanity checks
em++: warning: unexpected binaryen version: 95 (expected 93) [-Wversion-check]
em++: error: html-minifier-terser was not found! Please run "npm install" in Emscripten root directory to set up npm dependencies!
Comment by Sven-Hendrik Haase (Svenstaro) - Friday, 07 August 2020, 21:40 GMT

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