On attempting to update an existing code base that builds under C++17, we’re
now getting this build error:
live555/BasicUsageEnvironment/BasicTaskScheduler.cpp: In member function
‘virtual void BasicTaskScheduler::SingleStep(unsigned int)’:
live555/BasicUsageEnvironment/BasicTaskScheduler.cpp:191:40: error: ‘struct
std::atomic_flag’ has no member named ‘test’
191 | if (fTriggersAwaitingHandling[i].test()) {
| ^~~~
make[1]: *** [Makefile:4441:
live555/BasicUsageEnvironment/lib_liblivemedia_la-BasicTaskScheduler.lo] Error 1
This is because std::atomic_flag.test() does not exist before C++20, per
https://en.cppreference.com/w/cpp/atomic/atomic_flag
Changing our -std=gnu++17 flag to -std=gnu++20 does bypass the error, but it
means the rest of our code base also has to now build under that version, a
change we were avoiding taking on because $REASONS.
Was this change in minimum C++ version intentional?
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