fix: set /Zc:__cplusplus and /MP to MSVC only (#3139)

1. macro `__cplusplus` is enabled by clang-cl
2. `/MP` is not supported by clang-cl (warning `-Wunused-command-line-argument` will be generated)

CMakeLists.txt

@@ -34,7 +34,7 @@ elseif(NOT CMAKE_CXX_STANDARD)
 endif()
 
 # make sure __cplusplus is defined when using msvc and enable parallel build
-if(MSVC)
+if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
     string(APPEND CMAKE_CXX_FLAGS " /Zc:__cplusplus /MP")
 endif()
 
@@ -108,9 +108,11 @@ endif()
 if(WIN32)
     option(SPDLOG_WCHAR_SUPPORT "Support wchar api" OFF)
     option(SPDLOG_WCHAR_FILENAMES "Support wchar filenames" OFF)
+    option(SPDLOG_WCHAR_CONSOLE "Support wchar output to console" OFF)
 else()
     set(SPDLOG_WCHAR_SUPPORT OFF CACHE BOOL "non supported option" FORCE)
     set(SPDLOG_WCHAR_FILENAMES OFF CACHE BOOL "non supported option" FORCE)
+    set(SPDLOG_WCHAR_CONSOLE OFF CACHE BOOL "non supported option" FORCE)
 endif()
 
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
@@ -159,7 +161,7 @@ if(SPDLOG_BUILD_SHARED OR BUILD_SHARED_LIBS)
     endif()
     add_library(spdlog SHARED ${SPDLOG_SRCS} ${SPDLOG_ALL_HEADERS})
     target_compile_definitions(spdlog PUBLIC SPDLOG_SHARED_LIB)
-    if(MSVC)
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
         target_compile_options(spdlog PUBLIC $<$<AND:$<CXX_COMPILER_ID:MSVC>,$<NOT:$<COMPILE_LANGUAGE:CUDA>>>:/wd4251
                                              /wd4275>)
     endif()
@@ -237,9 +239,11 @@ endif()
 # Misc definitions according to tweak options
 # ---------------------------------------------------------------------------------------
 set(SPDLOG_WCHAR_TO_UTF8_SUPPORT ${SPDLOG_WCHAR_SUPPORT})
+set(SPDLOG_UTF8_TO_WCHAR_CONSOLE ${SPDLOG_WCHAR_CONSOLE})
 foreach(
     SPDLOG_OPTION
     SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    SPDLOG_UTF8_TO_WCHAR_CONSOLE
     SPDLOG_WCHAR_FILENAMES
     SPDLOG_NO_EXCEPTIONS
     SPDLOG_CLOCK_COARSE

README.md

@@ -437,7 +437,22 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
     logger->info("Some info message");
 }
 ```
+---
 
+#### Mapped Diagnostic Context
+```c++
+// Mapped Diagnostic Context (MDC) is a map that stores key-value pairs (string values) in thread local storage.
+// Each thread maintains its own MDC, which loggers use to append diagnostic information to log outputs.
+// Note: it is not supported in asynchronous mode due to its reliance on thread-local storage.
+#include "spdlog/mdc.h"
+void mdc_example()
+{
+    spdlog::mdc::put("key1", "value1");
+    spdlog::mdc::put("key2", "value2");
+    // if not using the default format, use the %& formatter to print mdc data
+    // spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [%&] %v");
+}
+```
 ---
 ## Benchmarks
 

example/example.cpp

@@ -26,6 +26,7 @@ void udp_example();
 void custom_flags_example();
 void file_events_example();
 void replace_default_logger_example();
+void mdc_example();
 
 #include "spdlog/spdlog.h"
 #include "spdlog/cfg/env.h"   // support for loading levels from the environment variable
@@ -84,6 +85,7 @@ int main(int, char *[]) {
         custom_flags_example();
         file_events_example();
         replace_default_logger_example();
+        mdc_example();
 
         // Flush all *registered* loggers using a worker thread every 3 seconds.
         // note: registered loggers *must* be thread safe for this to work correctly!
@@ -270,7 +272,7 @@ struct my_type {
 #ifndef SPDLOG_USE_STD_FORMAT  // when using fmtlib
 template <>
 struct fmt::formatter<my_type> : fmt::formatter<std::string> {
-    auto format(my_type my, format_context &ctx) -> decltype(ctx.out()) {
+    auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
         return fmt::format_to(ctx.out(), "[my_type i={}]", my.i);
     }
 };
@@ -376,3 +378,16 @@ void replace_default_logger_example() {
 
     spdlog::set_default_logger(old_logger);
 }
+
+// Mapped Diagnostic Context (MDC) is a map that stores key-value pairs (string values) in thread local storage.
+// Each thread maintains its own MDC, which loggers use to append diagnostic information to log outputs.
+// Note: it is not supported in asynchronous mode due to its reliance on thread-local storage.
+#include "spdlog/mdc.h"
+void mdc_example()
+{
+    spdlog::mdc::put("key1", "value1");
+    spdlog::mdc::put("key2", "value2");
+    // if not using the default format, you can use the %& formatter to print mdc data as well
+    spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [%&] %v");
+    spdlog::info("Some log message with context");
+}

include/spdlog/details/registry-inl.h

@@ -84,7 +84,6 @@ SPDLOG_INLINE std::shared_ptr<logger> registry::get(const std::string &logger_na
     return found == loggers_.end() ? nullptr : found->second;
 }
 
-
 SPDLOG_INLINE std::shared_ptr<logger> registry::default_logger() {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     return default_logger_;

include/spdlog/details/registry.h

@@ -44,7 +44,8 @@ public:
 
     // set default logger and add it to the registry if not registered already.
     // default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
-    // Note: Make sure to unregister it when no longer needed or before calling again with a new logger.
+    // Note: Make sure to unregister it when no longer needed or before calling again with a new
+    // logger.
     void set_default_logger(std::shared_ptr<logger> new_default_logger);
 
     void set_tp(std::shared_ptr<thread_pool> tp);

include/spdlog/details/thread_pool.h

@@ -67,9 +67,7 @@ struct async_msg : log_msg_buffer {
           worker_ptr{std::move(worker)},
           flush_promise{} {}
 
-    async_msg(async_logger_ptr &&worker,
-              async_msg_type the_type,
-              std::promise<void> &&promise)
+    async_msg(async_logger_ptr &&worker, async_msg_type the_type, std::promise<void> &&promise)
         : log_msg_buffer{},
           msg_type{the_type},
           worker_ptr{std::move(worker)},

include/spdlog/mdc.h

@@ -1,3 +1,6 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
 #pragma once
 
 #include <map>
@@ -5,6 +8,13 @@
 
 #include <spdlog/common.h>
 
+// MDC is a simple map of key->string values stored in thread local storage whose content will be printed by the loggers.
+// Note: Not supported in async mode (thread local storage - so the async thread pool have different copy).
+//
+// Usage example:
+// spdlog::mdc::put("mdc_key_1", "mdc_value_1");
+// spdlog::info("Hello, {}", "World!");  // => [2024-04-26 02:08:05.040] [info] [mdc_key_1:mdc_value_1] Hello, World!
+
 namespace spdlog {
 class SPDLOG_API mdc {
 public:

include/spdlog/pattern_formatter-inl.h

@@ -825,8 +825,6 @@ public:
     }
 };
 
-
-
 // Full info formatter
 // pattern: [%Y-%m-%d %H:%M:%S.%e] [%n] [%l] [%s:%#] %v
 class full_formatter final : public flag_formatter {
@@ -921,8 +919,6 @@ private:
     mdc_formatter<null_scoped_padder> mdc_formatter_{padding_info{}};
 };
 
-
-
 }  // namespace details
 
 SPDLOG_INLINE pattern_formatter::pattern_formatter(std::string pattern,

include/spdlog/sinks/rotating_file_sink-inl.h

@@ -60,7 +60,7 @@ SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::calc_filename(const filename
 
     filename_t basename, ext;
     std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
-    return fmt_lib::format(SPDLOG_FILENAME_T("{}.{}{}"), basename, index, ext);
+    return fmt_lib::format(SPDLOG_FMT_STRING(SPDLOG_FILENAME_T("{}.{}{}")), basename, index, ext);
 }
 
 template <typename Mutex>

include/spdlog/sinks/syslog_sink.h

@@ -64,13 +64,14 @@ protected:
     //
     // Simply maps spdlog's log level to syslog priority level.
     //
-    int syslog_prio_from_level(const details::log_msg &msg) const {
+    virtual int syslog_prio_from_level(const details::log_msg &msg) const {
         return syslog_levels_.at(static_cast<levels_array::size_type>(msg.level));
     }
 
-private:
     using levels_array = std::array<int, 7>;
     levels_array syslog_levels_;
+
+private:
     // must store the ident because the man says openlog might use the pointer as
     // is and not a string copy
     const std::string ident_;

include/spdlog/sinks/wincolor_sink-inl.h

@@ -134,9 +134,18 @@ void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::print_range_(const memory_buf_t
                                                              size_t start,
                                                              size_t end) {
     if (end > start) {
+#if defined(SPDLOG_UTF8_TO_WCHAR_CONSOLE)
+        wmemory_buf_t wformatted;
+        details::os::utf8_to_wstrbuf(string_view_t(formatted.data() + start, end - start),
+            wformatted);
+        auto size = static_cast<DWORD>(wformatted.size());
+        auto ignored = ::WriteConsoleW(static_cast<HANDLE>(out_handle_), wformatted.data(), size,
+            nullptr, nullptr);
+#else
         auto size = static_cast<DWORD>(end - start);
         auto ignored = ::WriteConsoleA(static_cast<HANDLE>(out_handle_), formatted.data() + start,
                                        size, nullptr, nullptr);
+#endif
         (void)(ignored);
     }
 }

include/spdlog/spdlog-inl.h

@@ -20,7 +20,6 @@ SPDLOG_INLINE std::shared_ptr<logger> get(const std::string &name) {
     return details::registry::instance().get(name);
 }
 
-
 SPDLOG_INLINE void set_formatter(std::unique_ptr<spdlog::formatter> formatter) {
     details::registry::instance().set_formatter(std::move(formatter));
 }

include/spdlog/version.h

@@ -5,7 +5,7 @@
 
 #define SPDLOG_VER_MAJOR 1
 #define SPDLOG_VER_MINOR 14
-#define SPDLOG_VER_PATCH 0
+#define SPDLOG_VER_PATCH 1
 
 #define SPDLOG_TO_VERSION(major, minor, patch) (major * 10000 + minor * 100 + patch)
 #define SPDLOG_VERSION SPDLOG_TO_VERSION(SPDLOG_VER_MAJOR, SPDLOG_VER_MINOR, SPDLOG_VER_PATCH)

tests/test_create_dir.cpp

@@ -139,7 +139,6 @@ TEST_CASE("non_existing_drive", "[create_dir]") {
     REQUIRE(create_dir(path) == false);
     path += SPDLOG_FILENAME_T("subdir");
     REQUIRE(create_dir(path) == false);
-            
 }
 // #endif  // SPDLOG_WCHAR_FILENAMES
 #endif  // _WIN32