C++ support in Zephyr

[alexanderwachter]

This is a tracking issue for C++ enhancements for Zephyr

Add any missing features, things that work and things that don't work here.

Missing features

List of missing features. The order defines the priority.

• Static local initialization. Static objects need to be guarded to get initialized properly (_cxa_guard* functions). PR exists: cpp: add support for function static initializers #19754
• syscalls for class methods
• std::mutex
• std::atomic
• std::thread

Things that don't work

• native_posix board behaves strange and does not terminate when compiled with gcov
• static objects (see missing feature)
• C++ standard library without exceptions. Exceptions getting enabled when the project links to the lib. Even with --fno-exceptions

Things that work

• Use C++ for App development with restrictions
• STL
• Exceptions

Nice to have

• exceptions with low footprint

[nashif]

@pabigot FYI

[pabigot]

@alexanderwachter could you perhaps update #18554 instead, and change its description to reflect "status as of 2.5"? We don't need multiple things tracking the gaps.

[abrodkin]

@evgeniy-paltsev @ruuddw FYI

[zephyrbot]

Hi @stephanosio,

This issue, marked as an Feature, was opened a while ago and did not get any traction. It was just assigned to you based on the labels. If you don't consider yourself the right person to address this issue, please re-assing it to the right person.

Please take a moment to review if the issue is still relevant to the project. If it is, please provide feedback and direction on how to move forward. If it is not, has already been addressed, is a duplicate, or is no longer relevant, please close it with a short comment explaining the reason.

@alexanderwachter you are also encouraged to help moving this issue forward by providing additional information and confirming this request/issue is still relevant to you.

Thanks!