# ITK5 crashes on older CPUs

**URL:** https://discourse.itk.org/t/itk5-crashes-on-older-cpus/2250
**Category:** Engineering
**Created:** [September 19, 2019, 11:23pm UTC](https://discourse.itk.org/t/itk5-crashes-on-older-cpus/2250 "2019-09-19T23:23:30Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![lassoan](https://discourse.itk.org/user_avatar/discourse.itk.org/lassoan/32/27_2.png) [@lassoan](https://discourse.itk.org/u/lassoan)
#### Post date: [September 20, 2019, 12:23am UTC](https://discourse.itk.org/t/itk5-crashes-on-older-cpus/2250/2 "2019-09-20T00:23:31Z")

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I had a look at ITK history and maybe there is something to do about this problem in ITK. There might have been some incorrect assumptions when [ITKSetStandardCompilerFlags.cmake](https://github.com/InsightSoftwareConsortium/ITK/blob/master/CMake/ITKSetStandardCompilerFlags.cmake) was modified recently.

See for example [this](https://github.com/InsightSoftwareConsortium/ITK/issues/1114) discussion. Maybe capabilities of the build computer are used to decide what CPU instruction set is allowed? That would not be ideal, because build computers are often newer/more powerful than computers of regular users.

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_[View the full topic](https://discourse.itk.org/t/itk5-crashes-on-older-cpus/2250)._