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

contrib/btree_gist/btree_ts.c

@@ -350,12 +350,13 @@ gbt_ts_union(PG_FUNCTION_ARGS)
 }
 
 
-#define penalty_check_max_float(val) do { \
+#define penalty_check_max_float(val) \
+	do { \
 		if ( val > FLT_MAX ) \
 				val = FLT_MAX; \
 		if ( val < -FLT_MAX ) \
 				val = -FLT_MAX; \
-} while(false);
+	} while (0)
 
 
 Datum

contrib/btree_gist/btree_utils_num.h

@@ -74,7 +74,7 @@ typedef struct
 	(*(result)) += (float) ( ((double)(tmp)) / ( (double)(tmp) + ( ((double)(oupper))*0.49F - ((double)(olower))*0.49F ) ) ); \
 	(*(result)) *= (FLT_MAX / (((GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1)); \
   } \
-} while (0);
+} while (0)
 
 
 /*

contrib/pg_trgm/trgm.h

@@ -44,7 +44,7 @@ typedef char trgm[3];
 	*(((char*)(a))+0) = *(((char*)(b))+0);	\
 	*(((char*)(a))+1) = *(((char*)(b))+1);	\
 	*(((char*)(a))+2) = *(((char*)(b))+2);	\
-} while(0);
+} while(0)
 
 #ifdef KEEPONLYALNUM
 #define ISWORDCHR(c)	(t_isalpha(c) || t_isdigit(c))

contrib/pgcrypto/crypt-blowfish.c

@@ -469,7 +469,7 @@ BF_swap(BF_word *x, int count)
 	tmp3 ^= tmp2; \
 	(R) ^= data.ctx.P[(N) + 1]; \
 	tmp3 += tmp1; \
-	(R) ^= tmp3;
+	(R) ^= tmp3
 #else
 /* Architectures with no complicated addressing modes supported */
 #define BF_INDEX(S, i) \
@@ -490,7 +490,7 @@ BF_swap(BF_word *x, int count)
 	tmp3 ^= tmp2; \
 	(R) ^= data.ctx.P[(N) + 1]; \
 	tmp3 += tmp1; \
-	(R) ^= tmp3;
+	(R) ^= tmp3
 #endif
 
 /*
@@ -516,17 +516,18 @@ BF_swap(BF_word *x, int count)
 	BF_ROUND(R, L, 15); \
 	tmp4 = R; \
 	R = L; \
-	L = tmp4 ^ data.ctx.P[BF_N + 1];
+	L = tmp4 ^ data.ctx.P[BF_N + 1]
 
 #if BF_ASM
 
 extern void _BF_body_r(BF_ctx *ctx);
 
 #define BF_body() \
-	_BF_body_r(&data.ctx);
+	_BF_body_r(&data.ctx)
 #else
 
 #define BF_body() \
+do { \
 	L = R = 0; \
 	ptr = data.ctx.P; \
 	do { \
@@ -542,7 +543,8 @@ extern void _BF_body_r(BF_ctx *ctx);
 		BF_ENCRYPT; \
 		*(ptr - 2) = L; \
 		*(ptr - 1) = R; \
-	} while (ptr < &data.ctx.S[3][0xFF]);
+	} while (ptr < &data.ctx.S[3][0xFF]); \
+} while (0)
 #endif
 
 static void

src/backend/utils/adt/formatting.c

@@ -422,7 +422,7 @@ 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,\

src/backend/utils/sort/gen_qsort_tuple.pl

@@ -125,7 +125,7 @@ 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/include/access/nbtree.h

@@ -584,7 +584,7 @@ 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)