diff --git a/COMPILE.md b/COMPILE.md
index aa80a15..3cc7f21 100644
--- a/COMPILE.md
+++ b/COMPILE.md
@@ -26,7 +26,8 @@ So you actually do not need Google Test, Google Benchmark and Doxygen.
 > [!WARNING]  
 > You may face some issues when building on macOS with Clang. That's not your fault.
 > Clang used libc++ library lacks some essential features used by this project.
-> You may try other solutions for compiling this project on macOS or with Clang.
+> A possible solution is that use GCC and libstdc++ on macOS instead of default Clang and libc++.
+> Build issue may be resolved until libc++ finish these features: `std::stacktrace` and `std::views::enumerate`.
 
 ### Google Test
 
diff --git a/benchmark/yycc/string/op.cpp b/benchmark/yycc/string/op.cpp
index 2f51f3c..bb27781 100644
--- a/benchmark/yycc/string/op.cpp
+++ b/benchmark/yycc/string/op.cpp
@@ -11,6 +11,7 @@ namespace yyccbench::string::op {
         std::u8string_view strl = u8" \thello\r\n"sv, words = u8" \t\r\n"sv;
         for (auto _ : state) {
             auto rv = OP::strip(strl, words);
+            benchmark::DoNotOptimize(rv);
         }
     }
     BENCHMARK(BM_StringStrip)->Name("StringStrip");
@@ -19,6 +20,7 @@ namespace yyccbench::string::op {
         std::u8string_view strl = u8" \thello\r\n"sv, words = u8" \t\r\n"sv;
         for (auto _ : state) {
             auto rv = OP::trim(strl, words);
+            benchmark::DoNotOptimize(rv);
         }
     }
     BENCHMARK(BM_StringTrim)->Name("StringTrim");