Change to INTERFACE in C17 requirement for ufcx target

FEniCS / ffcx

Next generation FEniCS Form Compiler for finite element forms

https://fenicsproject.org

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Change to INTERFACE in C17 requirement for ufcx target #710

Closed jhale closed 2 months ago

jhale commented 2 months ago

Fixes #709 - unsure why we didn't pick this up on CI.

The purpose of this change is so that consuming C++ libraries don't have to enable the C17 standard manually themselves.

jhale commented 2 months ago

We should probably consider adding a barebones CMake test that generates a kernel and builds a very basic C (or C++) program on top. Also useful as an example for our users who would like to use the generated code.