hai007
d0b258971d
In Prod LLVM release branch 515643669.1 ( cl/517696539 ) the experimental coroutines implementation is dropped. The `experimental/coroutines` header is removed. Nearby doesn't use coroutines, but it uses libraries that depend on the existence of coroutine function definitions. Specifically, WinRT needs certain coroutine function definitions in order to compile. Ordinarily, WinRT relied on the coroutine function definitions provided in the MSVC STL' `experimental/coroutines` header. The introduction of libc++ complicated this dependency for Nearby, because libc++' `experimental/coroutines` header took the place of the MSVC version, and (correctly, for C++17) provided none of the coroutine function definitions. To resolve these issues, we implemented a patch of WinRT. The patch provided placeholder definitions, which allowed WinRT to pass compilation. This patch was submitted in cl/495104919. The patch was necessary to enable the Nearby migration from MSVC STL to libc++. -- The removal of `experimental/coroutines` from libc++ makes this patch unnecessary. However, the patch will not compile without libc++' `experimental/coroutines` header. The presence of libc++' `experimental/coroutines` header had prevented the corresponding MSVC STL' header from defining the functions for which the patch makes placeholders. Without the libc++' `experimental/coroutines` header, the MSVC STL header is employed and makes these definitions. The patch then redefines these functions, which causes a compilation failure. -- This CL makes two changes: 1) It eliminates the patch, and 2) It eliminates the libc++ `experimental/coroutines` file from the Lexan libc++ distribution. This allows Nearby to function identically before and after the release of Lexan 515643669.1. This change prevents a break from occurring when Lexan 515643669.1 is released. PiperOrigin-RevId: 518119913
Nearby
Nearby is a collection of projects focused on connectivity that enable building cross-device experiences.
This is not an officially supported Google product.
Projects
Nearby Connection
A peer-to-peer networking API that allows apps to easily discover, connect to, and exchange data with nearby devices in real-time, regardless of network connectivity.
Fast Pair
Utilizes Bluetooth Low Energy (BLE) to discover nearby Bluetooth devices without using significant phone battery, enabling "magical" scenarios based on device proximity.
Nearby Presence
An extension to Nearby Connections that features an extensible identity model for authentication and restricted visibility, resource management for system health, and proximity detection through sensor fusion.
Nearby for Embedded Systems
A lightweight implementation of Fast Pair intended for embedded systems.
Contributing
We encourage you to contribute to Nearby! Please check out the Contributing to Nearby guide for guidelines about how to proceed.
License
Nearby is released under the Apache License 2.0