# Better Firmware with LLVM/Clang | Interrupt

**URL:** <https://community.memfault.com/t/better-firmware-with-llvm-clang-interrupt/195>\
**Category:** Blog\
**Created:** [May 20, 2020, 5:59am UTC](https://community.memfault.com/t/better-firmware-with-llvm-clang-interrupt/195 "2020-05-20T05:59:25Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![chrisc](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.memfault.com/chrisc/32/22_2.png) [@chrisc](https://community.memfault.com/u/chrisc)\
**Post date:** [May 21, 2020, 4:59pm UTC](https://community.memfault.com/t/better-firmware-with-llvm-clang-interrupt/195/4 "2020-05-21T16:59:15Z")

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Hi @kisielk,

Glad to hear you enjoyed the article! The error you hit above suggests you may not be targeting the right architecture. What CFLAGs are you using? (For example, if you are compiling for a cortex M4, you want to make sure you have something like `-mthumb` `-mcpu=cortex-m4`).

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_[View the full topic](https://community.memfault.com/t/better-firmware-with-llvm-clang-interrupt/195)._