No more flexible array members (not standard C++) (#1307)

* Replace FAMs with `std::vector`s (or one `std::string`) in four `struct`s

* Anonymous types declared in an anonymous union are also non-standard
  Only Clang complains about this (-Wnested-anon-types)

include/asm/fstack.hpp

@@ -9,6 +9,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <string>
+#include <vector>
 
 #include "asm/lexer.hpp"
 
@@ -28,14 +29,12 @@ struct FileStackNode {
 
 struct FileStackReptNode { // NODE_REPT
 	struct FileStackNode node;
-	uint32_t reptDepth;
-	// WARNING: if changing this type, change overflow check in `fstk_Init`
-	uint32_t iters[]; // REPT iteration counts since last named node, in reverse depth order
+	std::vector<uint32_t> *iters; // REPT iteration counts since last named node, in reverse depth order
 };
 
 struct FileStackNamedNode { // NODE_FILE, NODE_MACRO
 	struct FileStackNode node;
-	char name[]; // File name for files, file::macro name for macros
+	std::string *name; // File name for files, file::macro name for macros
 };
 
 #define DEFAULT_MAX_DEPTH 64

include/asm/macro.hpp

@@ -15,7 +15,7 @@ struct MacroArgs;
 
 struct MacroArgs *macro_GetCurrentArgs(void);
 struct MacroArgs *macro_NewArgs(void);
-void macro_AppendArg(struct MacroArgs **args, char *s);
+void macro_AppendArg(struct MacroArgs *args, char *s);
 void macro_UseNewArgs(struct MacroArgs *args);
 void macro_FreeArgs(struct MacroArgs *args);
 char const *macro_GetArg(uint32_t i);

include/asm/symbol.hpp

@@ -23,6 +23,12 @@ enum SymbolType {
 	SYM_REF // Forward reference to a label
 };
 
+// Only used in an anonymous union by `struct Symbol`
+struct strValue {
+	size_t size;
+	char *value;
+};
+
 struct Symbol {
 	char name[MAXSYMLEN + 1];
 	enum SymbolType type;
@@ -36,18 +42,12 @@ struct Symbol {
 	union {
 		// If sym_IsNumeric
 		int32_t value;
-		int32_t (*numCallback)(void);
+		int32_t (*numCallback)(void); // If hasCallback
 		// For SYM_MACRO
-		struct {
-			size_t size;
-			char *value;
-		} macro;
+		struct strValue macro;
 		// For SYM_EQUS
-		struct {
-			size_t size;
-			char *value;
-		} equs;
-		char const *(*strCallback)(void);
+		struct strValue equs;
+		char const *(*strCallback)(void); // If hasCallback
 	};
 
 	uint32_t ID; // ID of the symbol in the object file (-1 if none)