Make `-target-features` flag support disabling of a feature

2 files changed, 9 insertions, 1 deletions

diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp
index c2decf091..9256acbb2 100644
--- a/src/llvm_backend.cpp
+++ b/src/llvm_backend.cpp
@@ -3055,7 +3055,10 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
 		}
 		first = false;
 
-		llvm_features = gb_string_appendc(llvm_features, "+");
+		if (*str.text != '+' && *str.text != '-') {
+			llvm_features = gb_string_appendc(llvm_features, "+");
+		}
+
 		llvm_features = gb_string_append_length(llvm_features, str.text, str.len);
 	}
 
diff --git a/src/main.cpp b/src/main.cpp
index 6ad20cf26..2d58cf218 100644
--- a/src/main.cpp
+++ b/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("?")) {