__FILE__ 取 最后

refs: 

https://shijiashuai.netlify.app/post/2020/08/14/record-bugfix-1-strip-pre-path/

https://galowicz.de/2016/02/20/short_file_macro/

https://stackoverflow.com/questions/31050113/how-to-extract-the-source-filename-without-path-and-suffix-at-compile-time

 

 

方式一：

#define __FILENAME__ (__builtin_strrchr("/"__FILE__, '/') + 1)

方式二：

注：__FILE_NAME__  在gcc 12 开始支持，在clang 9.0.0 开始支持，所以下面的代码需要额外判断下编译器版本。

#define _var_to_str(name) #name
#define _int_to_str(line) _var_to_str(line)

#if defined(__clang__)

#define __SHORT_FILE__  __FILE_NAME__ 

#else  // defined(__GNUC__)

using cstr = const char* const;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wignored-qualifiers"
static constexpr cstr past_last_slash(cstr str, cstr last_slash)
{
    return *str == '\0'  ? last_slash
           : *str == '/' ? past_last_slash(str + 1, str + 1)
                         : past_last_slash(str + 1, last_slash);
}
static constexpr cstr past_last_slash(cstr str) { return past_last_slash(str, str); }
#pragma GCC diagnostic pop
#define __SHORT_FILE__                                             \
    ({                                                                                  \
        constexpr cstr sf__{past_last_slash(__FILE__)};    \
        sf__;                                                                         \
    })

#endif

方式三：

基于 gcc 8+，使用编译选项 -ffile-prefix-map=${WORKSPACE}/=/ 来替换

https://stackoverflow.com/questions/8487986/file-macro-shows-full-path

 

基于方式二封装printf

#define _var_to_str(name) #name
#define _int_to_str(line) _var_to_str(line)

#if defined(__clang__)

#define my_log(level, format, args...)                                 \
    ({ printf(level "[" __FILE_NAME__ ":" _int_to_str(__LINE__) "][my_log] " format, ##args); })

#else  // defined(__GNUC__)

using cstr = const char* const;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wignored-qualifiers"
static constexpr cstr past_last_slash(cstr str, cstr last_slash)
{
    return *str == '\0'  ? last_slash
           : *str == '/' ? past_last_slash(str + 1, str + 1)
                         : past_last_slash(str + 1, last_slash);
}
static constexpr cstr past_last_slash(cstr str) { return past_last_slash(str, str); }
#pragma GCC diagnostic pop
#define __SHORT_FILE__                                             \
    ({                                                                                  \
        constexpr cstr sf__{past_last_slash(__FILE__)};    \
        sf__;                                                                         \
    })
#define my_log(level, format, args...)                                 \
    ({ printf(level "[%s:" _int_to_str(__LINE__) "][tccpppb] " format, __SHORT_FILE__, ##args); })

#endif

#define my_debug(format, args...)                                     \
    ({                                                                                   \
        do                                                                             \
        {                                                                                \
        } while (0);                                                                \
    })
#define my_info(format, args...) ({ my_log("[info]", format, ##args); })
#define my_warn(format, args...) ({ my_log("[warn]", format, ##args); })
#define my_error(format, args...) ({ my_log("[error]", format, ##args); })
#define my_fatal(format, args...) ({ my_log("[fatal]", format, ##args); })