fix -Wextra related bugs

.github/workflows/ubuntu_pedantic.yml

@@ -34,7 +34,7 @@ jobs:
         run: cmake -D ADA_TESTING=ON -DBUILD_SHARED_LIBS=${{matrix.shared}} -G Ninja -B build
         env:
           CXX: g++-12
-          CXXFLAGS: -Werror
+          CXXFLAGS: -Werror -Wextra -Wno-unused-parameter
       - name: Build
         run: cmake --build build -j=4
       - name: Test

include/ada/url_pattern_helpers-inl.h

@@ -102,7 +102,8 @@ constructor_string_parser<regex_provider>::is_non_special_pattern_char(
   // If token’s value is not value, then return false.
   // TODO: Remove this once we make sure get_safe_token returns a non-empty
   // string.
-  if (!token->value.empty() && token->value[0] != value) {
+  if (!token->value.empty() &&
+      static_cast<uint32_t>(token->value[0]) != value) {
     return false;
   }
 

tests/wpt_urlpattern_tests.cpp

@@ -146,9 +146,9 @@ std::variant<ada::url_pattern_init, ada::url_pattern_options> parse_init(
     auto key = field.key().value();
     std::string_view value;
     if (field.value().get_string(value)) {
-      bool value_true;
-      EXPECT_FALSE(field.value().get_bool().get(value_true));
-      return ada::url_pattern_options{.ignore_case = value_true};
+      bool ignore_case = false;
+      EXPECT_FALSE(field.value().get_bool().get(ignore_case));
+      return ada::url_pattern_options{.ignore_case = ignore_case};
     }
     if (key == "protocol") {
       init.protocol = std::string(value);