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Document intentional violations of header inclusion policy.

Although there are good reasons for our policy of including postgres.h
as the first #include in every .c file, never from .h files, there are
two places where it seems expedient to violate the policy because the
alternative is to modify externally-supplied .c files.  (In the case
of the regexp library, the idea that it's externally-supplied is kind
of at odds with reality, but I haven't entirely given up hope that it
will become a standalone project some day.)  Add some comments to make
it explicit that this is a policy violation and provide the reasoning.

In passing, move #include "miscadmin.h" out of regcomp.c and into
regcustom.h, which is where it should be if we're taking this reasoning
seriously at all.

Discussion: https://postgr.es/m/CAEepm=2zCoeq3QxVwhS5DFeUh=yU6z81pbWMgfOB8OzyiBwxzw@mail.gmail.com
Discussion: https://postgr.es/m/11634.1488932128@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2017-03-08 17:01:13 -05:00
parent 2f899e7d37
commit d6b059ec74
3 changed files with 14 additions and 2 deletions

View File

@ -34,8 +34,6 @@
#include "regex/regguts.h"
#include "miscadmin.h" /* needed by rcancelrequested/rstacktoodeep */
/*
* forward declarations, up here so forward datatypes etc. are defined early
*/