In a back deployment scenario, this will provide a place where one could provide
function implementations that are not available in the relevant stdlib.
This is just setting up for future work and isn't doing anything interesting
beyond wiring it up/making sure that it is wired up correctly with tests.
In a back deployment scenario, this will provide a place where one could provide
function implementations that are not available in the relevant stdlib.
This is just setting up for future work and isn't doing anything interesting
beyond wiring it up/making sure that it is wired up correctly with tests.
Remove the flag being specified in multiple locations unnecessarily.
The flags flow downwards to all the subdirectories. Use that to apply
the C/C++ flags from the root of the runtime repository.
This is needed in situations where the minimum deployment target is
specified in build-script -- these libraries do not to obey to that
since we need to ensure we are able to back deploy those correctly.
Addresses rdar://59249988
The runtime that shipped with Swift 5.1 and earlier had a bug that interfered with backward
deployment of binaries that dynamically check for protocol conformances on conditionally-available
tests. This was fixed in the top-of-tree Swift runtime by https://github.com/apple/swift/pull/29887;
however, that doesn't do much good for running binaries on older OSes that don't have that fix.
In order for binaries built with a newer Swift compiler to run successfully on older OSes,
introduce a compatibility hook that replaces the conformance cache implementation in the original
OS runtime with a version based on the current implementation that has the fix for the protocol
conformance bug. Fixes rdar://problem/59460603
When building on macOS without the standard library but building the
extra toolchain content, we would fail to configure due to the missing
include of the `AddSwiftStdlib`.
