# Unrecognized command line option'-Wint-conversion'
**URL:** https://forum.legato.io/t/unrecognized-command-line-option-wint-conversion/3974
**Category:** Uncategorized
**Created:** [December 27, 2018, 3:11pm UTC](https://forum.legato.io/t/unrecognized-command-line-option-wint-conversion/3974 "2018-12-27T15:11:56Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@phoneixSH](https://forum.legato.io/u/phoneixSH)
#### Post date: [December 27, 2018, 3:11pm UTC](https://forum.legato.io/t/unrecognized-command-line-option-wint-conversion/3974/1 "2018-12-27T15:11:56Z")
I have a project that works perfectly well in the environment of legato 18.6.1.
Now the project is replaced by legato 16.10.4.
Compile error (arm-poky-linux-gnueabi-gcc: error: unrecognized command line option’-Wint-conversion’)
Is it because I added’- Wno - error = int - conversion’to the compilation options of the project?
How can I modify it to make the project compile successfully in legato 16.10.4
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### Author:  [@riotc](https://forum.legato.io/u/riotc)
#### Post date: [January 21, 2019, 3:43pm UTC](https://forum.legato.io/t/unrecognized-command-line-option-wint-conversion/3974/2 "2019-01-21T15:43:12Z")
Hello @phoneixSH , Do you still have this issue? Can you let me know the reason for adding the ‘- Wno - error’ option? The prototype of the legato API shall be same across the versions. So, the compilation of an app(built on legato 18.6.1 ) against a different version of legato (i.e… legato 16.1.04 in this case) should also happen successfully.
BTW, Can you let me know the module being used?
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### Author:  [@phoneixSH](https://forum.legato.io/u/phoneixSH)
#### Post date: [February 13, 2019, 4:16pm UTC](https://forum.legato.io/t/unrecognized-command-line-option-wint-conversion/3974/3 "2019-02-13T16:16:46Z")
Sorry, we have all used the legato 18 system in our project now，The problem may not be reappeared.