We need a minimum target of 15.7 or below because of CI, so add a new
`BacktracingDT 6.2` define. This is a bit of a hack for now to
unblock CI upgrades; we can go and clean things up and perhaps
generalise this mechanism later.
rdar://172129091
This is slightly complicated by us currently not supporting this code
on iOS/tvOS/watchOS/visionOS. We should fix that, at which point we
can use the `SwiftStdlib`/`StdlibDeploymentTarget` macros instead.
rdar://164850733
Added some explanatory text to the Compact Backtrace Format
documentation, and also to the `CMakeLists.txt` for the runtime.
Tweaked the conversions for `Backtrace.Address` to truncate, which
should result in reasonable behaviour for negative fixed-width
integers.
Use a constant for the ASCII values for `/` and `\` in the Compact
Image Format encoder/decoder.
Make the TSD key for `ElfImageCache` non-optional, and call
`fatalError()` if we don't get one.
rdar://124913332
It's useful to capture the platform and platform version with the image map.
Also, display both the platform and architecture information when generating
a crash log.
rdar://124913332
If we ended up with a `/` at the beginning of a string segment, we
were erroneously not adding to the expansion dictionary when we
should have been.
rdar://124913332
We want to be able to efficiently serialise lists of images, and to do so
it makes most sense to create a separate `ImageMap` type. This also provides
a useful place to put methods to e.g. find an image by address or by build
ID.
rdar://124913332
Alastair Houghton