From Jason Turner

[support.c.headers.general]

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  For compatibility with the C standard library, the C++ standard library
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  provides the *C headers* shown in [[c.headers]]. The intended use of
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  these headers is for interoperability only. It is possible that C++
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  source files need to include one of these headers in order to be valid
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- ISO C. Source files that are not intended to also be valid ISO C should
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- not use any of the C headers.
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  [*Note 1*: The C headers either have no effect, such as `<stdbool.h>`
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  and `<stdalign.h>`, or otherwise the corresponding header of the form
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  `<cname>` provides the same facilities and assuredly defines them in
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  namespace `std`. — *end note*]
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  [*Example 1*:
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- The following source file is both valid C++ and valid ISO C. Viewed as
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- C++, it declares a function with C language linkage; viewed as C it
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- simply declares a function (and provides a prototype).
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  ``` cpp
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- #include <stdbool.h> // for bool in C, no effect in C++{}
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  #include <stddef.h> // for size_t
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  #ifdef __cplusplus // see [cpp.predefined]
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  extern "C" // see [dcl.link]
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  #endif
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- void f(bool b[], size_t n);
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  ```
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  — *end example*]
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  For compatibility with the C standard library, the C++ standard library
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  provides the *C headers* shown in [[c.headers]]. The intended use of
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  these headers is for interoperability only. It is possible that C++
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  source files need to include one of these headers in order to be valid
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+ C. Source files that are not intended to also be valid C should not use
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+ any of the C headers.
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  [*Note 1*: The C headers either have no effect, such as `<stdbool.h>`
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  and `<stdalign.h>`, or otherwise the corresponding header of the form
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  `<cname>` provides the same facilities and assuredly defines them in
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  namespace `std`. — *end note*]
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  [*Example 1*:
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+ The following source file is both valid C++ and valid C. Viewed as C++,
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+ it declares a function with C language linkage; viewed as C it simply
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+ declares a function (and provides a prototype).
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  ``` cpp
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+ #include <uchar.h> // for char8_t in C, not necessary in C++{}
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  #include <stddef.h> // for size_t
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  #ifdef __cplusplus // see [cpp.predefined]
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  extern "C" // see [dcl.link]
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  #endif
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+ void f(char8_t s[], size_t n);
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  ```
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  — *end example*]
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