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nlohmann
2026-07-09 15:25:36 +00:00
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api/macros/json_has_filesystem/index.html
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api/macros/json_has_filesystem/index.md
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@@ -11,6 +11,19 @@ When compiling with C++17, the library provides conversions from and to [`std::f
The default value is detected based on the preprocessor macros `__cpp_lib_filesystem`, `__cpp_lib_experimental_filesystem`, `__has_include(<filesystem>)`, or `__has_include(<experimental/filesystem>)`.
Known compiler/stdlib exclusions
Even when the feature-test macro indicates filesystem support is available, the library disables it on the following broken toolchains:
- **MinGW + GCC 8** — disabled entirely (broken `std::filesystem` implementation; [MinGW-w64 bug 737](https://sourceforge.net/p/mingw-w64/bugs/737/))
- **GCC (non-Clang) < 8** — disabled (no filesystem support)
- **Clang < 7** — disabled (no filesystem support)
- **MSVC < 19.14** — disabled (no filesystem support)
- **iOS < 13** — disabled (no filesystem support)
- **macOS < Catalina (10.15)** — disabled (no filesystem support)
If `JSON_HAS_FILESYSTEM` or `JSON_HAS_EXPERIMENTAL_FILESYSTEM` is `0` despite `__cpp_lib_filesystem` being defined, one of the exclusions above likely applies to your toolchain.
## Notes
- Note that older compilers or older versions of libstdc++ also require the library `stdc++fs` to be linked to for filesystem support.