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Cannot perform static_assert in C++ on header files generated by pioasm #2650

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opened 2025-09-06 09:24:11 -05:00 by rhulme · 1 comment

rhulme commented

2025-09-06 09:24:11 -05:00

(Migrated from github.com)

Because the pio_program structure is not declared constexpr, it's not possible to perform compile-time checks on the contents.

In my project, I have a couple of PIO programs that I would like to ensure both fit in a single PIO instance (i.e. in the 32-word memory) and discover at compile-time if changes are made that would prevent this, rather than with a panic at run-time.

Obviously, constexpr is a C++ keyword so can't be used if the header file is included from a plain C file, but the keyword to use can be determined via checking whether __cplusplus is defined.

Because the ```pio_program``` structure is not declared ```constexpr```, it's not possible to perform compile-time checks on the contents. In my project, I have a couple of PIO programs that I would like to ensure both fit in a single PIO instance (i.e. in the 32-word memory) and discover at compile-time if changes are made that would prevent this, rather than with a panic at run-time. Obviously, ```constexpr``` is a C++ keyword so can't be used if the header file is included from a plain C file, but the keyword to use can be determined via checking whether ```__cplusplus``` is defined.

lurch commented

2026-03-02 18:27:24 -06:00

(Migrated from github.com)

Linked PR has been merged into develop

Linked PR has been merged into `develop`

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