Merge pull request #5794 from alsakandari/improve-target-features

Improve target features flag by allowing the user to disable a target feature

src/build_settings.cpp

@@ -2093,7 +2093,19 @@ gb_internal bool check_target_feature_is_enabled(String const &feature, String *
 	for (;;) {
 		String str = string_split_iterator(&it, ',');
 		if (str == "") break;
+
 		if (!string_set_exists(&build_context.target_features_set, str)) {
+			String plus_str = concatenate_strings(temporary_allocator(), make_string_c("+"), str);
+
+			if (!string_set_exists(&build_context.target_features_set, plus_str)) {
+				if (not_enabled) *not_enabled = str;
+				return false;
+			}
+		}
+
+		String minus_str = concatenate_strings(temporary_allocator(), make_string_c("-"), str);
+
+		if (string_set_exists(&build_context.target_features_set, minus_str)) {
 			if (not_enabled) *not_enabled = str;
 			return false;
 		}

src/llvm_backend.cpp

@@ -3055,7 +3055,10 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
 		}
 		first = false;
 
+		if (*str.text != '+' && *str.text != '-') {
 			llvm_features = gb_string_appendc(llvm_features, "+");
+		}
+
 		llvm_features = gb_string_append_length(llvm_features, str.text, str.len);
 	}
 

src/main.cpp

@@ -3719,6 +3719,11 @@ int main(int arg_count, char const **arg_ptr) {
 			String item = string_split_iterator(&target_it, ',');
 			if (item == "") break;
 
+			if (*item.text == '+' || *item.text == '-') {
+				item.text++;
+				item.len--;
+			}
+
 			String invalid;
 			if (!check_target_feature_is_valid_for_target_arch(item, &invalid) && item != str_lit("help")) {
 				if (item != str_lit("?")) {