proxygen

Now that proxygen can be consumed in a more granular fashion, it should be possible to build the library with fewer dependencies. For example, only the client and DNS pieces need c-ares, and zlib/zstd are only used for optional compression/decompression filters.

The comments in indicate that will be invoked for all handlers and that will never be invoked prior to : These comments do not match the implementation. For example, when a request contains an header (where is anything other than ), will invoke and detach the handler without having invoked . There are a lot of conditions between creating a handler and the session invoking , and the set of conditions varies depending on the underlying session type, so it's not obvious whether there are other scenarios that also violate the contract. Is this a defect in the implementation or the comments?

Summary: glog 0.7+ requires GLOG_USE_GLOG_EXPORT to be defined before including its headers. In the granular CMake build, glog::glog is linked PRIVATE on the monolithic proxygen library, so its INTERFACE_COMPILE_DEFINITIONS don't propagate to the individual OBJECT libraries. This causes build failures on macOS where homebrew installs glog 0.7+. After find_package(Glog), read the compile definitions from glog::glog and apply them globally via add_compile_definitions so all proxygen targets get them. Differential Revision: D93369119