af1a949109
In commit 9c0a0de4c, I'd failed to notice that catalog/catalog.h should also be considered a frontend-unsafe header, because it includes (and needs) the full form of pg_class.h, not to mention relcache.h. However, various frontend code was depending on it to get TABLESPACE_VERSION_DIRECTORY, so refactoring of some sort is called for. The cleanest answer seems to be to move TABLESPACE_VERSION_DIRECTORY, as well as the OIDCHARS symbol, to common/relpath.h. Do that, and mop up inclusions as necessary. (I found that quite a few current users of catalog/catalog.h don't seem to need it at all anymore, apparently as a result of the refactorings that created common/relpath.[hc]. And initdb.c needed it only as a route to pg_class_d.h.) Discussion: https://postgr.es/m/6629.1523294509@sss.pgh.pa.us
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