Ivan Grokhotkov 31310d46e7 doc: fatal-errors: note on missing returns and IllegalInstruction ...

In C++ code it is considered to be undefined behavior to exit a
non-void function without returning a value. Normally this is
detected by the compiler, but users could disable relevant warnings.
Add a note about this possibility.

See https://github.com/espressif/esp-idf/issues/8244 for context.

2022-01-18 10:43:13 +01:00

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