Fix C++ incompatibilities in ecpg/preproc/ header files.

There's probably no need to back-patch this, since it seems unlikely
that anybody would be inserting C++ code into ecpg's preprocessor.

Discussion: https://postgr.es/m/b517ec3918d645eb950505eac8dd434e@gaz-is.ru

src/interfaces/ecpg/preproc/ecpg.c

@@ -99,13 +99,13 @@ add_preprocessor_define(char *define)
 		/* symbol has a value */
 		for (tmp = ptr - 1; *tmp == ' '; tmp--);
 		tmp[1] = '\0';
-		defines->old = define_copy;
-		defines->new = ptr + 1;
+		defines->olddef = define_copy;
+		defines->newdef = ptr + 1;
 	}
 	else
 	{
-		defines->old = define_copy;
-		defines->new = mm_strdup("1");
+		defines->olddef = define_copy;
+		defines->newdef = mm_strdup("1");
 	}
 	defines->pertinent = true;
 	defines->used = NULL;
@@ -410,8 +410,8 @@ main(int argc, char *const argv[])
 					defptr = defines;
 					defines = defines->next;
 
-					free(defptr->new);
-					free(defptr->old);
+					free(defptr->newdef);
+					free(defptr->olddef);
 					free(defptr);
 				}
 
@@ -423,8 +423,8 @@ main(int argc, char *const argv[])
 					{
 						defptr->next = this->next;
 
-						free(this->new);
-						free(this->old);
+						free(this->newdef);
+						free(this->olddef);
 						free(this);
 					}
 				}

src/interfaces/ecpg/preproc/pgc.l

@@ -1114,14 +1114,14 @@ cppline			{space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
 
 					for (ptr = defines; ptr != NULL; ptr2 = ptr, ptr = ptr->next)
 					{
-						if (strcmp(yytext, ptr->old) == 0)
+						if (strcmp(yytext, ptr->olddef) == 0)
 						{
 							if (ptr2 == NULL)
 								defines = ptr->next;
 							else
 								ptr2->next = ptr->next;
-							free(ptr->new);
-							free(ptr->old);
+							free(ptr->newdef);
+							free(ptr->olddef);
 							free(ptr);
 							break;
 						}
@@ -1300,8 +1300,10 @@ cppline			{space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
 						yytext[i+1] = '\0';
 
 						for (defptr = defines;
-							 defptr != NULL && strcmp(yytext, defptr->old) != 0;
-							 defptr = defptr->next);
+							 defptr != NULL &&
+							 strcmp(yytext, defptr->olddef) != 0;
+							 defptr = defptr->next)
+							/* skip */ ;
 
 						preproc_tos++;
 						stacked_if_value[preproc_tos].else_branch = false;
@@ -1333,10 +1335,10 @@ cppline			{space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
 
 						for (ptr = defines; ptr != NULL; ptr = ptr->next)
 						{
-							 if (strcmp(old, ptr->old) == 0)
+							 if (strcmp(old, ptr->olddef) == 0)
 							 {
-								free(ptr->new);
-								ptr->new = mm_strdup(literalbuf);
+								free(ptr->newdef);
+								ptr->newdef = mm_strdup(literalbuf);
 							 }
 						}
 						if (ptr == NULL)
@@ -1344,8 +1346,8 @@ cppline			{space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
 							this = (struct _defines *) mm_alloc(sizeof(struct _defines));
 
 							/* initial definition */
-							this->old = old;
-							this->new = mm_strdup(literalbuf);
+							this->olddef = old;
+							this->newdef = mm_strdup(literalbuf);
 							this->next = defines;
 							this->used = NULL;
 							defines = this;
@@ -1613,7 +1615,7 @@ static bool isdefine(void)
 	/* is it a define? */
 	for (ptr = defines; ptr; ptr = ptr->next)
 	{
-		if (strcmp(yytext, ptr->old) == 0 && ptr->used == NULL)
+		if (strcmp(yytext, ptr->olddef) == 0 && ptr->used == NULL)
 		{
 			struct _yy_buffer *yb;
 
@@ -1626,7 +1628,7 @@ static bool isdefine(void)
 
 			ptr->used = yy_buffer = yb;
 
-			yy_scan_string(ptr->new);
+			yy_scan_string(ptr->newdef);
 			return true;
 		}
 	}

src/interfaces/ecpg/preproc/type.h

@@ -160,8 +160,8 @@ struct typedefs
 
 struct _defines
 {
-	char	   *old;
-	char	   *new;
+	char	   *olddef;
+	char	   *newdef;
 	int			pertinent;
 	void	   *used;
 	struct _defines *next;