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3e908fb54f
Newer compilers warned about
extern int _CRT_glob = 0;
which is indeed a mysterious C construction, as it combines "extern"
and an initialization. It turns out that according to the C standard,
the "extern" is ignored here, so we can remove it to resolve the
warnings. But then we also need to add a real extern
declaration (without initializer) to satisfy
-Wmissing-variable-declarations.
(Note that this code is only active on MinGW.)
Discussion: https://www.postgresql.org/message-id/1053279b-da01-4eb4-b7a3-da6b5d8f73d1%40eisentraut.org