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5edeb57428
Three variables in pqsignal.h (UnBlockSig, BlockSig and StartupBlockSig) were not marked with PGDLLIMPORT, as they are declared in a way that prevents mark_pgdllimport.pl to detect them. These variables are redefined in a style more consistent with the other headers, allowing the script to find and mark them. PGDLLIMPORT was missing for __pg_log_level in logging.h, so add it back. The marking got accidentally removed in 9a374b77, just after its addition in 8ec5694. While on it, add a comment in mark_pgdllimport.pl explaining what are the arguments needed by the script (aka a list of header paths). Reported-by: Andres Freund Discussion: https://postgr.es/m/20220506234924.6mxxotl3xl63db3l@alap3.anarazel.de