Get rid of trailing semicolons in C macro definitions.

Writing a trailing semicolon in a macro is almost never the right thing,
because you almost always want to write a semicolon after each macro
call instead.  (Even if there was some reason to prefer not to, pgindent
would probably make a hash of code formatted that way; so within PG the
rule should basically be "don't do it".)  Thus, if we have a semi inside
the macro, the compiler sees "something;;".  Much of the time the extra
empty statement is harmless, but it could lead to mysterious syntax
errors at call sites.  In perhaps an overabundance of neatnik-ism, let's
run around and get rid of the excess semicolons whereever possible.

The only thing worse than a mysterious syntax error is a mysterious
syntax error that only happens in the back branches; therefore,
backpatch these changes where relevant, which is most of them because
most of these mistakes are old.  (The lack of reported problems shows
that this is largely a hypothetical issue, but still, it could bite
us in some future patch.)

John Naylor and Tom Lane

Discussion: https://postgr.es/m/CACPNZCs0qWTqJ2QUSGJ07B7uvAvzMb-KbG2q+oo+J3tsWN5cqw@mail.gmail.com

src/backend/nodes/readfuncs.c

@@ -154,22 +154,22 @@
 /* Read an attribute number array */
 #define READ_ATTRNUMBER_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readAttrNumberCols(len);
+	local_node->fldname = readAttrNumberCols(len)
 
 /* Read an oid array */
 #define READ_OID_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readOidCols(len);
+	local_node->fldname = readOidCols(len)
 
 /* Read an int array */
 #define READ_INT_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readIntCols(len);
+	local_node->fldname = readIntCols(len)
 
 /* Read a bool array */
 #define READ_BOOL_ARRAY(fldname, len) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
-	local_node->fldname = readBoolCols(len);
+	local_node->fldname = readBoolCols(len)
 
 /* Routine exit */
 #define READ_DONE() \

src/backend/optimizer/util/pathnode.c

@@ -3859,7 +3859,7 @@ do { \
 	(path) = reparameterize_path_by_child(root, (path), child_rel); \
 	if ((path) == NULL) \
 		return NULL; \
-} while(0);
+} while(0)
 
 #define REPARAMETERIZE_CHILD_PATH_LIST(pathlist) \
 do { \
@@ -3870,7 +3870,7 @@ do { \
 		if ((pathlist) == NIL) \
 			return NULL; \
 	} \
-} while(0);
+} while(0)
 
 	Path	   *new_path;
 	ParamPathInfo *new_ppi;

src/backend/utils/adt/formatting.c

@@ -479,7 +479,7 @@ typedef struct
 			(_X)->mode, (_X)->hh, (_X)->pm, (_X)->mi, (_X)->ss, (_X)->ssss, \
 			(_X)->d, (_X)->dd, (_X)->ddd, (_X)->mm, (_X)->ms, (_X)->year, \
 			(_X)->bc, (_X)->ww, (_X)->w, (_X)->cc, (_X)->j, (_X)->us, \
-			(_X)->yysz, (_X)->clock);
+			(_X)->yysz, (_X)->clock)
 #define DEBUG_TM(_X) \
 		elog(DEBUG_elog_output, "TM:\nsec %d\nyear %d\nmin %d\nwday %d\nhour %d\nyday %d\nmday %d\nnisdst %d\nmon %d\n",\
 			(_X)->tm_sec, (_X)->tm_year,\
@@ -2731,11 +2731,13 @@ DCH_to_char(FormatNode *node, bool is_interval, TmToChar *in, char *out, Oid col
 					str_numth(s, s, S_TH_TYPE(n->suffix));
 				s += strlen(s);
 				break;
+
 #define DCH_to_char_fsec(frac_fmt, frac_val) \
 				sprintf(s, frac_fmt, (int) (frac_val)); \
 				if (S_THth(n->suffix)) \
 					str_numth(s, s, S_TH_TYPE(n->suffix)); \
-				s += strlen(s);
+				s += strlen(s)
+
 			case DCH_FF1:		/* tenth of second */
 				DCH_to_char_fsec("%01d", in->fsec / 100000);
 				break;

src/backend/utils/sort/gen_qsort_tuple.pl

@@ -126,7 +126,7 @@ swapfunc(SortTuple *a, SortTuple *b, size_t n)
 		SortTuple t = *(a);				\
 		*(a) = *(b);					\
 		*(b) = t;						\
-	} while (0);
+	} while (0)
 
 #define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n)
 

src/bin/pg_dump/pg_backup_archiver.h

@@ -98,7 +98,7 @@ typedef z_stream *z_streamp;
 #define K_VERS_MAJOR 1
 #define K_VERS_MINOR 14
 #define K_VERS_REV 0
-#define K_VERS_SELF MAKE_ARCHIVE_VERSION(K_VERS_MAJOR, K_VERS_MINOR, K_VERS_REV);
+#define K_VERS_SELF MAKE_ARCHIVE_VERSION(K_VERS_MAJOR, K_VERS_MINOR, K_VERS_REV)
 
 /* Newest format we can read */
 #define K_VERS_MAX	MAKE_ARCHIVE_VERSION(K_VERS_MAJOR, K_VERS_MINOR, 255)

src/include/access/hash.h

@@ -148,7 +148,7 @@ typedef struct HashScanPosData
 		(scanpos).firstItem = 0; \
 		(scanpos).lastItem = 0; \
 		(scanpos).itemIndex = 0; \
-	} while (0);
+	} while (0)
 
 /*
  *	HashScanOpaqueData is private state for a hash index scan.

src/include/access/nbtree.h

@@ -888,7 +888,7 @@ typedef BTScanPosData *BTScanPos;
 		(scanpos).buf = InvalidBuffer; \
 		(scanpos).lsn = InvalidXLogRecPtr; \
 		(scanpos).nextTupleOffset = 0; \
-	} while (0);
+	} while (0)
 
 /* We need one of these for each equality-type SK_SEARCHARRAY scan key */
 typedef struct BTArrayKeyInfo

src/port/qsort.c

@@ -80,7 +80,7 @@ do {		\
 } while (0)
 
 #define SWAPINIT(a, es) swaptype = ((char *)(a) - (char *)0) % sizeof(long) || \
-	(es) % sizeof(long) ? 2 : (es) == sizeof(long)? 0 : 1;
+	(es) % sizeof(long) ? 2 : (es) == sizeof(long)? 0 : 1
 
 static void
 swapfunc(char *a, char *b, size_t n, int swaptype)

src/port/qsort_arg.c

@@ -80,7 +80,7 @@ do {		\
 } while (0)
 
 #define SWAPINIT(a, es) swaptype = ((char *)(a) - (char *)0) % sizeof(long) || \
-	(es) % sizeof(long) ? 2 : (es) == sizeof(long)? 0 : 1;
+	(es) % sizeof(long) ? 2 : (es) == sizeof(long)? 0 : 1
 
 static void
 swapfunc(char *a, char *b, size_t n, int swaptype)