fix: try fix clang libcxx charconv issue.

- add compile checker in cmake to detect charconv support status.
- and expose macro for yycc to enable different part of charconv repectively to prevent duplicated defines.

CMakeLists.txt

@@ -26,6 +26,9 @@ set(YYCC_INSTALL_BIN_PATH ${CMAKE_INSTALL_BINDIR} CACHE PATH
 set(YYCC_INSTALL_DOC_PATH ${CMAKE_INSTALL_DOCDIR} CACHE PATH
 "Non-arch doc install path relative to CMAKE_INSTALL_PREFIX unless set to an absolute path.")
 
+# Test charconv support due to shitty clang's libcxx.
+include(${CMAKE_CURRENT_LIST_DIR}/cmake/check_charconv.cmake)
+
 # Include dependency.
 # GTest is required if we build test
 if (YYCC_BUILD_TEST)

cmake/check_charconv.cmake

@@ -0,0 +1,30 @@
+message(STATUS "Checking charconv implementation...")
+include(CheckCXXSourceCompiles)
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/chars_format.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_CHARS_FORMAT)
+message(STATUS "Support std::chars_format: ${YYCC_CHARCONV_HAS_CHARS_FORMAT}")
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/from_chars_result.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_FROM_CHARS_RESULT)
+message(STATUS "Support std::from_chars_result: ${YYCC_CHARCONV_HAS_FROM_CHARS_RESULT}")
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/to_chars_result.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_TO_CHARS_RESULT)
+message(STATUS "Support std::to_chars_result: ${YYCC_CHARCONV_HAS_TO_CHARS_RESULT}")
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/from_chars_int.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_FROM_CHARS_INT)
+message(STATUS "Support std::from_chars with integral type: ${YYCC_CHARCONV_HAS_FROM_CHARS_INT}")
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/from_chars_float.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_FROM_CHARS_FLOAT)
+message(STATUS "Suppoer std::from_chars with float point type: ${YYCC_CHARCONV_HAS_FROM_CHARS_FLOAT}")
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/to_chars_int.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_TO_CHARS_INT)
+message(STATUS "Support std::to_chars with integral type: ${YYCC_CHARCONV_HAS_TO_CHARS_INT}")
+
+file(READ "${CMAKE_CURRENT_LIST_DIR}/check_charconv/to_chars_float.cpp" TEST_CODE_SNIPPET)
+check_cxx_source_compiles("${TEST_CODE_SNIPPET}" YYCC_CHARCONV_HAS_TO_CHARS_FLOAT)
+message(STATUS "Support std::to_chars with float point type: ${YYCC_CHARCONV_HAS_TO_CHARS_FLOAT}")

cmake/check_charconv/chars_format.cpp

@@ -0,0 +1,8 @@
+#include <charconv>
+
+int main(int argc, char **argv) {
+    auto scientific = std::chars_format::scientific;
+    auto fixed = std::chars_format::fixed;
+    auto general = std::chars_format::general;
+    auto hex = std::chars_format::hex;
+}

cmake/check_charconv/from_chars_float.cpp

@@ -0,0 +1,16 @@
+#include <charconv>
+
+int main(int argc, char **argv) {
+    const char probe[] = "0.0";
+    const char* first = probe;
+    const char* last = first + sizeof(probe);
+
+    {
+        float value;
+        auto rv = std::from_chars(first, last, value, std::chars_format::general);
+    }
+    {
+        double value;
+        auto rv = std::from_chars(first, last, value, std::chars_format::general);
+    }
+}

cmake/check_charconv/from_chars_int.cpp

@@ -0,0 +1,41 @@
+#include <charconv>
+#include <cstdint>
+
+int main(int argc, char **argv) {
+    const char probe[] = "0";
+    const char* first = probe;
+    const char* last = first + sizeof(probe);
+
+    {
+        std::int8_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::int16_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::int32_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::int64_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::uint8_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::uint16_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::uint32_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+    {
+        std::uint64_t value;
+        auto rv = std::from_chars(first, last, value, 10);
+    }
+}

cmake/check_charconv/from_chars_result.cpp

@@ -0,0 +1,9 @@
+#include <charconv>
+#include <system_error>
+
+int main(int argc, char **argv) {
+    std::from_chars_result result {
+        .ptr = nullptr,
+        .ec = std::errc{},
+    };
+}

cmake/check_charconv/to_chars_float.cpp

@@ -0,0 +1,16 @@
+#include <charconv>
+
+int main(int argc, char **argv) {
+    char buffer[1024];
+    char* first = buffer;
+    char* last = first + sizeof(buffer);
+
+    {
+        float value = 0;
+        auto rv = std::to_chars(first, last, value, std::chars_format::general, 6);
+    }
+    {
+        double value = 0;
+        auto rv = std::to_chars(first, last, value, std::chars_format::general, 6);
+    }
+}

cmake/check_charconv/to_chars_int.cpp

@@ -0,0 +1,41 @@
+#include <charconv>
+#include <cstdint>
+
+int main(int argc, char **argv) {
+    char buffer[1024];
+    char* first = buffer;
+    char* last = first + sizeof(buffer);
+
+    {
+        std::int8_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::int16_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::int32_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::int64_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::uint8_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::uint16_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::uint32_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+    {
+        std::uint64_t value = 0;
+        auto rv = std::to_chars(first, last, value, 10);
+    }
+}

cmake/check_charconv/to_chars_result.cpp

@@ -0,0 +1,9 @@
+#include <charconv>
+#include <system_error>
+
+int main(int argc, char **argv) {
+    std::to_chars_result result {
+        .ptr = nullptr,
+        .ec = std::errc{},
+    };
+}

src/CMakeLists.txt

@@ -167,6 +167,15 @@ PUBLIC
     # Fix Windows header file shit
     $<$<BOOL:${WIN32}>:WIN32_LEAN_AND_MEAN>
     $<$<BOOL:${WIN32}>:NOMINMAX>
+PUBLIC
+    $<$<BOOL:${YYCC_CHARCONV_HAS_CHARS_FORMAT}>:YYCC_CHARCONV_HAS_CHARS_FORMAT>
+    $<$<BOOL:${YYCC_CHARCONV_HAS_FROM_CHARS_RESULT}>:YYCC_CHARCONV_HAS_FROM_CHARS_RESULT>
+    $<$<BOOL:${YYCC_CHARCONV_HAS_TO_CHARS_RESULT}>:YYCC_CHARCONV_HAS_TO_CHARS_RESULT>
+    $<$<BOOL:${YYCC_CHARCONV_HAS_FROM_CHARS_INT}>:YYCC_CHARCONV_HAS_FROM_CHARS_INT>
+    $<$<BOOL:${YYCC_CHARCONV_HAS_FROM_CHARS_FLOAT}>:YYCC_CHARCONV_HAS_FROM_CHARS_FLOAT>
+    $<$<BOOL:${YYCC_CHARCONV_HAS_TO_CHARS_INT}>:YYCC_CHARCONV_HAS_TO_CHARS_INT>
+    $<$<BOOL:${YYCC_CHARCONV_HAS_TO_CHARS_FLOAT}>:YYCC_CHARCONV_HAS_TO_CHARS_FLOAT>
+
 )
 target_compile_options(YYCCommonplace
 PUBLIC

src/yycc/num/parse.hpp

@@ -5,11 +5,10 @@
 #include <type_traits>
 #include <stdexcept>
 #include <expected>
+#include <charconv>
 
 #if defined(YYCC_STL_CLANGSTL)
-#include "patch/libcxx/charconv.hpp"
-#else
-#include <charconv>
+#include "../patch/libcxx/charconv.hpp"
 #endif
 
 #define NS_YYCC_STRING_REINTERPRET ::yycc::string::reinterpret

src/yycc/num/stringify.hpp

@@ -4,11 +4,10 @@
 #include <array>
 #include <type_traits>
 #include <stdexcept>
+#include <charconv>
 
 #if defined(YYCC_STL_CLANGSTL)
-#include "patch/libcxx/charconv.hpp"
-#else
-#include <charconv>
+#include "../patch/libcxx/charconv.hpp"
 #endif
 
 #define NS_YYCC_STRING_REINTERPRET ::yycc::string::reinterpret

src/yycc/patch/libcxx/charconv.hpp

@@ -1,7 +1,7 @@
 #pragma once
 #include "../../macro/stl_detector.hpp"
 
-#if defined(YYCC_STL_CLANGSTL)
+//#if defined(YYCC_STL_CLANGSTL)
 
 /**
  * @private
@@ -13,6 +13,7 @@
  * This polyfill is generated by AI.
  */
 
+#include <charconv>
 #include <system_error>
 #include <cctype>
 #include <climits>
@@ -26,6 +27,8 @@
 
 namespace std {
 
+#if !defined(YYCC_CHARCONV_HAS_CHARS_FORMAT)
+
     enum class chars_format : unsigned int {
         scientific = 1,
         fixed = 2,
@@ -33,6 +36,10 @@ namespace std {
         general = fixed | scientific // This should be 6 (fixed|scientific)
     };
 
+#endif
+
+#if !defined(YYCC_CHARCONV_HAS_FROM_CHARS_RESULT)
+
     struct from_chars_result {
         const char* ptr;
         std::errc ec;
@@ -41,6 +48,10 @@ namespace std {
         constexpr explicit operator bool() const noexcept { return ec == std::errc{}; }
     };
 
+#endif
+
+#if !defined(YYCC_CHARCONV_HAS_TO_CHARS_RESULT)
+
     struct to_chars_result {
         char* ptr;
         std::errc ec;
@@ -49,6 +60,10 @@ namespace std {
         constexpr explicit operator bool() const noexcept { return ec == std::errc{}; }
     };
 
+#endif
+
+#if !defined(YYCC_CHARCONV_HAS_TO_CHARS_INT)
+
     /// @private
     enum class __integral_type {
         u8,
@@ -172,16 +187,21 @@ namespace std {
         // Use snprintf with appropriate format
         const auto max_buffer_size = static_cast<size_t>(last - first);
         const char* format_string = __get_int_format<integral_type>(integral_base_type);
-        int written = std::snprintf(first, max_buffer_size, format_string, val);
+        int written = std::snprintf(first, max_buffer_size, format_string, value);
         if (written < 0 || static_cast<size_t>(written) >= max_buffer_size) {
             return {last, std::errc::value_too_large};
         }
         return {first + written, std::errc{}};
     }
 
+#endif
+
+#if !defined(YYCC_CHARCONV_HAS_TO_CHARS_FLOAT)
+
     /// @private
     enum class __float_type {
-        f32, f64,
+        f32,
+        f64,
     };
 
     /// @private
@@ -197,9 +217,7 @@ namespace std {
     }
 
     /// @private
-    enum class __float_fmt_type {
-        general, scientific, fixed, hex
-    };
+    enum class __float_fmt_type { general, scientific, fixed, hex };
 
     /// @private
     std::optional<__float_fmt_type> __classify_float_fmt(chars_format fmt) {
@@ -265,7 +283,7 @@ namespace std {
         const auto float_fmt_type = std::move(opt_float_fmt_type.value());
 
         const auto max_buffer_size = static_cast<size_t>(last - first);
-        const char *format_string = __get_float_format<float_type>(float_fmt_type);
+        const char* format_string = __get_float_format<float_type>(float_fmt_type);
         int written = std::snprintf(first, max_buffer_size, format_string, precision, value);
         if (written < 0 || static_cast<size_t>(written) >= max_buffer_size) {
             return {last, std::errc::value_too_large};
@@ -273,10 +291,12 @@ namespace std {
         return {first + written, std::errc{}};
     }
 
+#endif
+
+#if !defined(YYCC_CHARCONV_HAS_FROM_CHARS_INT)
+
     /// @private
-    enum class __strtoi_cluster {
-        tol, toll, toul, toull
-    };
+    enum class __strtoi_cluster { tol, toll, toul, toull };
 
     /// @private
     template<typename T>
@@ -330,19 +350,19 @@ namespace std {
 
         errno = 0;
         char* end_ptr = const_cast<char*>(first);
-        auto rv = __execute_strtoi<strtoi_cluster>(buffer.data(), &end_ptr, base);
+        auto result = __execute_strtoi<strtoi_cluster>(buffer.data(), &end_ptr, base);
         if (errno == ERANGE) {
             return {end_ptr, std::errc::result_out_of_range};
         }
 
-        using strtoi_cluster_rvtype = decltype(rv);
+        using strtoi_cluster_rvtype = decltype(result);
         // Check if result fits in T
         if (result < static_cast<strtoi_cluster_rvtype>(std::numeric_limits<T>::min())
             || result > static_cast<strtoi_cluster_rvtype>(std::numeric_limits<T>::max())) {
             return {end_ptr, std::errc::result_out_of_range};
         }
 
-        if (end_ptr == buffer.data) {
+        if (end_ptr == buffer.data()) {
             return {first, std::errc::invalid_argument};
         }
 
@@ -355,10 +375,12 @@ namespace std {
         return {first + (end_ptr - buffer.data()), std::errc{}};
     }
 
+#endif
+
+#if !defined(YYCC_CHARCONV_HAS_FROM_CHARS_FLOAT)
+
     /// @private
-    enum class __strtof_cluster {
-        tof, tod
-    };
+    enum class __strtof_cluster { tof, tod };
 
     /// @private
     template<typename T>
@@ -399,12 +421,12 @@ namespace std {
 
         errno = 0;
         char* end_ptr = const_cast<char*>(first);
-        auto rv = __execute_strtof<strtof_cluster>(buffer.data(), &end_ptr);
+        auto result = __execute_strtof<strtof_cluster>(buffer.data(), &end_ptr);
         if (errno == ERANGE) {
             return {end_ptr, std::errc::result_out_of_range};
         }
 
-        if (end_ptr == buffer.data) {
+        if (end_ptr == buffer.data()) {
             return {first, std::errc::invalid_argument};
         }
 
@@ -417,6 +439,8 @@ namespace std {
         return {first + (end_ptr - buffer.data()), std::errc{}};
     }
 
+#endif
+
 } // namespace std
 
-#endif
+//#endif