Krzysztof Parzyszek 871086bf7f [flang] Avoid passing null pointers to nonnull parameters (#84785) ...

Certain functions in glibc have "nonnull" attributes on pointer
parameters (even in cases where passing a null pointer should be handled
correctly). There are a few cases of such calls in flang: memcmp and
memcpy with the length parameter set to 0.

Avoid passing a null pointer to these functions, since the conflict with
the nonnull attribute could cause an undefined behavior.

This was detected by the undefined behavior sanitizer.

2024-03-12 07:53:57 -05:00

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