deploy: ca91678af1

community/quality_assurance.md

@@ -10,6 +10,8 @@ violations will result in a failed build.
 
     Any compiler with complete C++11 support can compile the library without warnings.
 
+Note: Some modern features (like C++20 ranges or filesystem support) may be disabled on specific broken or incomplete toolchains even when standard feature-test macros indicate support. See [`JSON_HAS_RANGES`](../api/macros/json_has_ranges.md) and [`JSON_HAS_FILESYSTEM`](../api/macros/json_has_filesystem.md) for details on known exclusions.
+
 - [x] The library is compiled with 50+ different C++ compilers with different operating systems and platforms,
   including the oldest versions known to compile the library.
 

community/quality_assurance/index.md

@@ -8,6 +8,8 @@ Requirement: Compiler support
 
 Any compiler with complete C++11 support can compile the library without warnings.
 
+Note: Some modern features (like C++20 ranges or filesystem support) may be disabled on specific broken or incomplete toolchains even when standard feature-test macros indicate support. See [`JSON_HAS_RANGES`](https://json.nlohmann.me/api/macros/json_has_ranges/index.md) and [`JSON_HAS_FILESYSTEM`](https://json.nlohmann.me/api/macros/json_has_filesystem/index.md) for details on known exclusions.
+
 - The library is compiled with 50+ different C++ compilers with different operating systems and platforms, including the oldest versions known to compile the library.
 
   Compilers used in continuous integration