# Crystal crashed on a debug build

**URL:** <https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595>\
**Category:** Help & Support\
**Created:** [August 8, 2021, 1:04am UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595 "2021-08-08T01:04:13Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![beta-ziliani](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/beta-ziliani/32/1821_2.png) [@beta-ziliani](https://forum.crystal-lang.org/u/beta-ziliani)\
**Post date:** [August 11, 2021, 8:38pm UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/7 "2021-08-11T20:38:57Z")

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One thing though: LLVM 11 is only good on Homebrew, and LLVM 12 will not be supported. The reason is that LLVM 11 and 12 are shipped with a bug that prevent Crystal from working properly. The patch exists, but only landed for LLVM 13. The exception is Homebrew’s LLVM 11 because @bcardiff requested HB to add the patch.

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