[lldb] Fix layering violation between Host & Platform on the Swift fork #10302
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This moves two functions from Platform to Host: 1. GetCurrentXcodeToolchainDirectory 2. GetCurrentCommandLineToolsDirectory. These two functions caused a layering violation in the Swift fork, which added a dependency from lldbHost to lldbPlatform. As show by this PR, there's no need for these two functions to live in Platform, and we already have similar functions in Host. We have various layering violations but this one is particularly bad, because lldb-dap started depending on lldbHost. On the Swift fork, this library was depending on lldbPlatform which pulled in various Swift files, which libLLDB needs, but lldb-dap itself does not. We were missing RPATHs to resume them, so in the current nightly, lldb-dap crashes because the dynamic loader can't find the missing Swift libs. rdar://146537366 (cherry picked from commit a5b02a8)
adrian-prantl
approved these changes
Mar 19, 2025
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See llvm#132119 for details.