# Advice on C++20 modules (Boost)

**URL:** https://discourse.cmake.org/t/advice-on-c-20-modules-boost/10641
**Category:** Usage
**Created:** [April 11, 2024, 2:58pm UTC](https://discourse.cmake.org/t/advice-on-c-20-modules-boost/10641 "2024-04-11T14:58:25Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![ben.boeckel](https://discourse.cmake.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [April 11, 2024, 5:44pm UTC](https://discourse.cmake.org/t/advice-on-c-20-modules-boost/10641/3 "2024-04-11T17:44:58Z")

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> [@anarthal](#):
>
> However, the module is built only once - if the users has two executables with BMI-incompatible build flags, the module can’t be used for both.

Known issue; on the roadmap. I’ll try to remember to report back here or loop you in when I have something testable.

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