Mac平台使用nlohmann/json的json.hpp编译报错求助

Hey there! I’ve dealt with similar encoding hiccups using the nlohmann/json library on macOS before, so let’s walk through some concrete fixes to resolve your compile error:

• Verify and fix the json.hpp file encoding
  Sometimes the downloaded header file might have an unexpected encoding (like UTF-8 with BOM, which clang doesn’t handle well). Open json.hpp in a text editor like VS Code or Sublime Text:

  1. Check the encoding (VS Code shows it in the bottom-right corner)
  2. If it’s not plain UTF-8, go to File > Save with Encoding and select UTF-8 (make sure there’s no "with BOM" suffix)

• Add encoding flags to your compile command
  Force your compiler to use UTF-8 explicitly by adding these flags when compiling:

  g++ -std=c++17 -finput-charset=UTF-8 -fexec-charset=UTF-8 your_source.cpp -o your_program
  

  This tells clang to treat all input files as UTF-8 and output the executable with UTF-8 encoding, which should resolve most encoding mismatches.

• Redownload a clean copy of json.hpp
  Corrupted or incorrectly formatted downloads can cause encoding issues. Grab the latest official single-header version of the library (from its official repository) and replace your local json.hpp file. Make sure to download it directly as a raw text file to avoid any automatic encoding conversions.

• Adjust IDE encoding settings (if using one)

  • For Xcode: Open your project, go to Build Settings > Text Settings, set the encoding for all source and header files to UTF-8, and enable the option to convert files to UTF-8 on save.
  • For VS Code: Add these lines to your workspace settings.json:

    "files.encoding": "utf8",
    "files.autoGuessEncoding": false
    

If none of these work, sharing the exact compiler error message would help narrow things down further—but these steps usually fix the encoding-related compile issues with nlohmann/json on Mac.

内容的提问来源于stack exchange，提问作者v_eece