Implement -Wunmatched-directive

src/asm/charmap.cpp

@@ -113,6 +113,12 @@ void charmap_Pop() {
 	charmapStack.pop();
 }
 
+void charmap_CheckStack() {
+	if (!charmapStack.empty()) {
+		warning(WARNING_UNMATCHED_DIRECTIVE, "`PUSHC` without corresponding `POPC`\n");
+	}
+}
+
 void charmap_Add(std::string const &mapping, std::vector<int32_t> &&value) {
 	if (mapping.empty()) {
 		error("Cannot map an empty string\n");

src/asm/main.cpp

@@ -384,6 +384,10 @@ int main(int argc, char *argv[]) {
 	sect_CheckLoadClosed();
 	sect_CheckSizes();
 
+	charmap_CheckStack();
+	opt_CheckStack();
+	sect_CheckStack();
+
 	if (nbErrors != 0)
 		errx("Assembly aborted (%u error%s)!", nbErrors, nbErrors == 1 ? "" : "s");
 

src/asm/opt.cpp

@@ -184,3 +184,9 @@ void opt_Pop() {
 	warningsAreErrors = entry.warningsAreErrors;
 	warningStates = entry.warningStates;
 }
+
+void opt_CheckStack() {
+	if (!stack.empty()) {
+		warning(WARNING_UNMATCHED_DIRECTIVE, "`PUSHO` without corresponding `POPO`\n");
+	}
+}

src/asm/section.cpp

@@ -973,6 +973,12 @@ void sect_PopSection() {
 	std::swap(currentUnionStack, entry.unionStack);
 }
 
+void sect_CheckStack() {
+	if (!sectionStack.empty()) {
+		warning(WARNING_UNMATCHED_DIRECTIVE, "`PUSHS` without corresponding `POPS`\n");
+	}
+}
+
 void sect_EndSection() {
 	if (!currentSection)
 		fatalerror("Cannot end the section outside of a SECTION\n");

src/asm/warning.cpp

@@ -56,6 +56,7 @@ static const WarningFlag warningFlags[NB_WARNINGS] = {
     {"obsolete",             LEVEL_DEFAULT   },
     {"shift",                LEVEL_EVERYTHING},
     {"shift-amount",         LEVEL_EVERYTHING},
+    {"unmatched-directive",  LEVEL_EXTRA     },
     {"unterminated-load",    LEVEL_EXTRA     },
     {"user",                 LEVEL_DEFAULT   },
     // Parametric warnings