https://bugs.llvm.org/show_bug.cgi?id=40981

            Bug ID: 40981
           Summary: Audit <cxxxx> header files for compliance with
                    [depr.c.headers.other]
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangb...@nondot.org
          Reporter: mclow.li...@gmail.com
                CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com

Review our header files for compliance with [depr.c.headers.other], which says:

> Every C header other than <complex.h>, <iso646.h>, <stdalign.h>, <stdbool.h>, 
> and <tgmath.h>, each of which has a name of the form <name.h>, behaves as if 
> each name placed in the standard library namespace by the corresponding 
> <cname > header is placed within the global namespace scope, except for the 
> functions described in 25.8.5, the declaration of std::byte (16.2.1), and the 
> functions and function templates described in 16.2.5. It is unspecified 
> whether these names are first declared or defined within namespace scope 
> (6.3.6) of the namespace std and are then injected into the global namespace 
> scope by explicit using-declarations (9.8).

I'm pretty sure we don't do this for the three-argument hypot, and there may be
others.

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