Alastair Houghton f02f62f1e3 [Backtracing] Add support for looking up paths for auxiliary executables. ...

We need to be able to locate `swift-backtrace` relative to the current
location of the runtime library.

This needs to work:

* In a Swift build directory.
* On Darwin, where we're installed in /usr/lib/swift and /usr/libexec/swift.
* On Linux, where we're in /usr/lib/swift/linux and /usr/libexec/swift/linux.
* On Windows, where we may be in a flat directory layout (because of limitations
  of Windows DLL lookups).

rdar://103071801

2023-03-01 13:43:15 +00:00

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