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IWYU widely useful pragmas

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Add various widely useful "IWYU pragma" annotations, such as

- Common header files such as c.h, postgres.h should be "always_keep".

- System headers included in c.h, postgres.h etc. should be considered
  "export".

- Some portability headers such as getopt_long.h should be
  "always_keep", so they are not considered superfluous on some
  platforms.

- Certain system headers included from portability headers should be
  considered "export" because the purpose of the portability header is
  to wrap them.

- Superfluous includes marked as "for backward compatibility" get a
  formal IWYU annotation.

- Generated header included in utils/syscache.h is marked exported.
  This is a very commonly used include and this avoids lots of
  complaints.

Discussion: https://www.postgresql.org/message-id/flat/9395d484-eff4-47c2-b276-8e228526c8ae@eisentraut.org
This commit is contained in:
Peter Eisentraut
2025-01-15 18:57:53 +01:00
parent 761c79508e
commit 74938d1320
12 changed files with 30 additions and 10 deletions
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3
src/include/getopt_long.h
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@@ -6,10 +6,11 @@
*
* src/include/getopt_long.h
*/
/* IWYU pragma: always_keep */
#ifndef GETOPT_LONG_H
#define GETOPT_LONG_H
#include "pg_getopt.h"
#include "pg_getopt.h" /* IWYU pragma: export */
#ifndef HAVE_STRUCT_OPTION