Rename parser token REF to REF_P to avoid a symbol conflict.

In the latest version of Apple's macOS SDK, 
fails to compile if "REF" is #define'd as something.
Apple may or may not agree that this is a bug, and even if
they do accept the bug report I filed, they probably won't
fix it very quickly.  In the meantime, our back branches will all
fail to compile gram.y.  v15 and HEAD currently escape the problem
thanks to the refactoring done in 98e93a1fc, but that's purely
accidental.  Moreover, since that patch removed a widely-visible
inclusion of , back-patching it seems too likely to break
third-party code.

Instead, change the token's code name to REF_P, following our usual
convention for naming parser tokens that are likely to have symbol
conflicts.  The effects of that should be localized to the grammar
and immediately surrounding files, so it seems like a safer answer.

Per project policy that we want to keep recently-out-of-support
branches buildable on modern systems, back-patch all the way to 9.2.

Discussion: https://postgr.es/m/1803927.1665938411@sss.pgh.pa.us

diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 62829186919314c70273870950b5f60de4acc294..635d17dcea62633cb5201da483ac40a170fb0ffa 100644 (file)
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -688,7 +688,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 
    QUOTE
 
-   RANGE READ REAL REASSIGN RECHECK RECURSIVE REF REFERENCES REFERENCING
+   RANGE READ REAL REASSIGN RECHECK RECURSIVE REF_P REFERENCES REFERENCING
    REFRESH REINDEX RELATIVE_P RELEASE RENAME REPEATABLE REPLACE REPLICA
    RESET RESTART RESTRICT RETURNING RETURNS REVOKE RIGHT ROLE ROLLBACK ROLLUP
    ROUTINE ROUTINES ROW ROWS RULE
@@ -14251,7 +14251,7 @@ xmlexists_argument:
        ;
 
 xml_passing_mech:
-           BY REF
+           BY REF_P
            | BY VALUE_P
        ;
 
@@ -15469,7 +15469,7 @@ unreserved_keyword:
            | REASSIGN
            | RECHECK
            | RECURSIVE
-           | REF
+           | REF_P
            | REFERENCING
            | REFRESH
            | REINDEX

diff --git a/src/include/parser/kwlist.h b/src/include/parser/kwlist.h
index 08f22ce211ddb6b44a8983fad41e51fba5cf560d..4121a53ba0f6902b55d4ecea4a444f74c451d6b3 100644 (file)
--- a/src/include/parser/kwlist.h
+++ b/src/include/parser/kwlist.h
@@ -330,7 +330,7 @@ PG_KEYWORD("real", REAL, COL_NAME_KEYWORD)
 PG_KEYWORD("reassign", REASSIGN, UNRESERVED_KEYWORD)
 PG_KEYWORD("recheck", RECHECK, UNRESERVED_KEYWORD)
 PG_KEYWORD("recursive", RECURSIVE, UNRESERVED_KEYWORD)
-PG_KEYWORD("ref", REF, UNRESERVED_KEYWORD)
+PG_KEYWORD("ref", REF_P, UNRESERVED_KEYWORD)
 PG_KEYWORD("references", REFERENCES, RESERVED_KEYWORD)
 PG_KEYWORD("referencing", REFERENCING, UNRESERVED_KEYWORD)
 PG_KEYWORD("refresh", REFRESH, UNRESERVED_KEYWORD)