After upgrading to Ubuntu 22.04LTS I've now got g++ 11 as the default compiler, and it emits a bunch of warnings related to:
[22/223] Building CXX object phosphor/CMakeFiles/phosphor.dir/src/trace_buffer.cc.o
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In file included from /home/trond/compile/trunk/phosphor/include/phosphor/trace_buffer.h:26,
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from /home/trond/compile/trunk/phosphor/src/trace_buffer.cc:20:
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/home/trond/compile/trunk/phosphor/include/gsl_p/iterator.h: In instantiation of ‘class gsl_p::multidimensional_iterator<phosphor::TraceBuffer::chunk_iterator>’:
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/home/trond/compile/trunk/phosphor/src/trace_buffer.cc:169:47: required from here
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/home/trond/compile/trunk/phosphor/include/gsl_p/iterator.h:45:28: warning: ‘this’ pointer is null [-Wnonnull]
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45 | using U = decltype((*((T*)nullptr))->begin());
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| ^
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/home/trond/compile/trunk/phosphor/src/trace_buffer.cc:80:23: note: in a call to non-static member function ‘const phosphor::TraceChunk* phosphor::TraceBuffer::chunk_iterator::operator->() const’
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80 | const TraceChunk* TraceBuffer::chunk_iterator::operator->() const {
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| ^~~~~~~~~~~
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In file included from /home/trond/compile/trunk/phosphor/include/phosphor/trace_buffer.h:26,
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from /home/trond/compile/trunk/phosphor/src/trace_buffer.cc:20:
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/home/trond/compile/trunk/phosphor/include/gsl_p/iterator.h:45:28: warning: ‘this’ pointer is null [-Wnonnull]
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45 | using U = decltype((*((T*)nullptr))->begin());
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| ^
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/home/trond/compile/trunk/phosphor/src/trace_buffer.cc:80:23: note: in a call to non-static member function ‘const phosphor::TraceChunk* phosphor::TraceBuffer::chunk_iterator::operator->() const’
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80 | const TraceChunk* TraceBuffer::chunk_iterator::operator->() const {
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| ^~~~~~~~~~~
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Major