Cannot build the contracts on macOS

[simonerom]

Trying to build the contracts directory:

» nvm use 14
Now using node v14.16.1 (npm v6.14.12)

» npm install
...
» npm run build

the last command returns this:

» npm run build

> iott-example-contracts@0.1.0 build /Users/simone/Source/github/iotexproject/iott-dapp-example/contracts
> hardhat compile && find artifacts/contracts/**/*.json | grep -v 'dbg' | xargs -i cp {} abis/

Nothing to compile
xargs: illegal option -- i
usage: xargs [-0opt] [-E eofstr] [-I replstr [-R replacements] [-S replsize]]
             [-J replstr] [-L number] [-n number [-x]] [-P maxprocs]
             [-s size] [utility [argument ...]]
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! iott-example-contracts@0.1.0 build: `hardhat compile && find artifacts/contracts/**/*.json | grep -v 'dbg' | xargs -i cp {} abis/`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the iott-example-contracts@0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/simone/.npm/_logs/2021-08-02T15_33_04_117Z-debug.log

Full log attached below:
debug.log

[simonerom]

Possibly this is due to compiling on MacOS actually, let me try on Ubuntu...

[simonerom]

So the this error does not show up if I build onUbuntu. I'm renaming this as "Cannot build the contracts on macOS" and leave it open as a reminder for future support of macOS (if we want to support it, otherwise this can be closed)

[maswalker]

find artifacts/contracts/**/*.json | grep -v 'dbg' | xargs -i cp {} abis/

This command is used to copy *.json files to abis directory except *.dbg.json, and it works correctlly on linux server.
I think the error was caused by the difference of ‘xargs’ command implemented on macOS and linux.
xargs -i