Gabor Horvath 27879c7bfa [cxx-interop] Support _LIBCPP_PREFERRED_OVERLOAD ...

Some functions like memchr are defined both in libc++ and libc.
Including both would result in ambiguous references at the call sites.
This is worked around by an attribute that tells the compiler to prefer
one overload over the others. This attribute was not interpreted by
Swift. As a result, importing both libc and libc++ and calling such
functions resulted in compilation errors due to ambiguous overloads.
This PR modifies the lookup logic to exclude the non-preferred Clang
functions from the overload set whenever a preferred overload is
available.

rdar://152192945

2025-06-06 18:05:35 +01:00

14 KiB

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