Move gramparse.h to src/backend/parser

This header is semi-private, being used only in files related to
raw parsing, so move to the backend directory where those files
live. This allows removal of Makefile rules that symlink gram.h to
src/include/parser, since gramparse.h can now include gram.h from
within the same directory. This has the side-effect of no longer
installing gram.h and gramparse.h, but there doesn't seem to be a
good reason to continue doing so.

Per suggestion from Andres Freund and Peter Eisentraut
Discussion: https://www.postgresql.org/message-id/20220904181759.px6uosll6zbxcum5%40awork3.anarazel.de

src/backend/Makefile

@@ -153,12 +153,7 @@ submake-utils-headers:
 
 .PHONY: generated-headers
 
-generated-headers: $(top_builddir)/src/include/parser/gram.h $(top_builddir)/src/include/storage/lwlocknames.h submake-catalog-headers submake-nodes-headers submake-utils-headers
-
-$(top_builddir)/src/include/parser/gram.h: parser/gram.h
-	prereqdir=`cd '$(dir $<)' >/dev/null && pwd` && \
-	  cd '$(dir $@)' && rm -f $(notdir $@) && \
-	  $(LN_S) "$$prereqdir/$(notdir $<)" .
+generated-headers: $(top_builddir)/src/include/storage/lwlocknames.h submake-catalog-headers submake-nodes-headers submake-utils-headers
 
 $(top_builddir)/src/include/storage/lwlocknames.h: storage/lmgr/lwlocknames.h
 	prereqdir=`cd '$(dir $<)' >/dev/null && pwd` && \

src/backend/parser/gram.y

@@ -55,9 +55,9 @@
 #include "catalog/pg_trigger.h"
 #include "commands/defrem.h"
 #include "commands/trigger.h"
+#include "gramparse.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "parser/gramparse.h"
 #include "parser/parser.h"
 #include "storage/lmgr.h"
 #include "utils/date.h"

src/backend/parser/gramparse.h

@@ -11,7 +11,7 @@
  * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * src/include/parser/gramparse.h
+ * src/backend/parser/gramparse.h
  *
  *-------------------------------------------------------------------------
  */
@@ -26,7 +26,7 @@
  * NB: include gram.h only AFTER including scanner.h, because scanner.h
  * is what #defines YYLTYPE.
  */
-#include "parser/gram.h"
+#include "gram.h"
 
 /*
  * The YY_EXTRA data that a flex scanner allows us to pass around.  Private

src/backend/parser/parser.c

@@ -22,7 +22,7 @@
 #include "postgres.h"
 
 #include "mb/pg_wchar.h"
-#include "parser/gramparse.h"
+#include "gramparse.h"
 #include "parser/parser.h"
 #include "parser/scansup.h"
 

src/backend/parser/scan.l

@@ -36,7 +36,7 @@
 #include <unistd.h>
 
 #include "common/string.h"
-#include "parser/gramparse.h"
+#include "gramparse.h"
 #include "parser/parser.h"		/* only needed for GUC variables */
 #include "parser/scansup.h"
 #include "port/pg_bitutils.h"

src/include/Makefile

@@ -53,7 +53,7 @@ install: all installdirs
 	  $(INSTALL_DATA) $(srcdir)/$$dir/*.h '$(DESTDIR)$(includedir_server)'/$$dir || exit; \
 	done
 ifeq ($(vpath_build),yes)
-	for file in catalog/schemapg.h catalog/system_fk_info.h catalog/pg_*_d.h parser/gram.h storage/lwlocknames.h utils/probes.h; do \
+	for file in catalog/schemapg.h catalog/system_fk_info.h catalog/pg_*_d.h storage/lwlocknames.h utils/probes.h; do \
 	  $(INSTALL_DATA) $$file '$(DESTDIR)$(includedir_server)'/$$file || exit; \
 	done
 endif
@@ -72,7 +72,7 @@ uninstall:
 
 clean:
 	rm -f utils/fmgroids.h utils/fmgrprotos.h utils/errcodes.h utils/header-stamp
-	rm -f parser/gram.h storage/lwlocknames.h utils/probes.h
+	rm -f storage/lwlocknames.h utils/probes.h
 	rm -f catalog/schemapg.h catalog/system_fk_info.h
 	rm -f catalog/pg_*_d.h catalog/header-stamp
 	rm -f nodes/nodetags.h nodes/header-stamp

src/include/parser/.gitignore

@@ -1 +0,0 @@
-/gram.h

src/tools/msvc/Install.pm

@@ -618,10 +618,6 @@ sub CopyIncludeFiles
 		'Server headers',
 		$target . '/include/server/',
 		'src/include/', 'pg_config.h', 'pg_config_ext.h', 'pg_config_os.h');
-	CopyFiles(
-		'Grammar header',
-		$target . '/include/server/parser/',
-		'src/backend/parser/', 'gram.h');
 	CopySetOfFiles(
 		'',
 		[ glob("src\\include\\*.h") ],

src/tools/pginclude/cpluspluscheck

@@ -125,7 +125,6 @@ do
 	test "$f" = contrib/cube/cubeparse.h && continue
 	test "$f" = contrib/seg/segparse.h && continue
 	test "$f" = src/backend/bootstrap/bootparse.h && continue
-	test "$f" = src/include/parser/gram.h && continue
 	test "$f" = src/backend/parser/gram.h && continue
 	test "$f" = src/backend/replication/repl_gram.h && continue
 	test "$f" = src/backend/replication/syncrep_gram.h && continue

src/tools/pginclude/headerscheck

@@ -120,7 +120,6 @@ do
 	test "$f" = contrib/cube/cubeparse.h && continue
 	test "$f" = contrib/seg/segparse.h && continue
 	test "$f" = src/backend/bootstrap/bootparse.h && continue
-	test "$f" = src/include/parser/gram.h && continue
 	test "$f" = src/backend/parser/gram.h && continue
 	test "$f" = src/backend/replication/repl_gram.h && continue
 	test "$f" = src/backend/replication/syncrep_gram.h && continue