[all-commits] [llvm/llvm-project] 197182: [Driver] Fix `ToolChain::getCompilerRTPath()` to r...

[Dan Liew via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1971823ecb9eaa077554a5d268a44c7cb75eccce
      https://github.com/llvm/llvm-project/commit/1971823ecb9eaa077554a5d268a44c7cb75eccce
  Author: Dan Liew <dliew at apple.com>
  Date:   2021-05-04 (Tue, 04 May 2021)

  Changed paths:
    M clang/lib/Driver/ToolChain.cpp
    A clang/test/Driver/darwin-print-file-name.c
    A clang/test/Driver/darwin-print-runtime-dir.c

  Log Message:
  -----------
  [Driver] Fix `ToolChain::getCompilerRTPath()` to return the correct path on Apple platforms.

When the target triple was an Apple platform `ToolChain::getOSLibName()`
(called by `getCompilerRTPath()`) would return the full OS name
including the version number (e.g. `darwin20.3.0`). This is not correct
because the library directory for all Apple platforms is `darwin`.

This in turn caused

* `-print-runtime-dir` to return a non-existant path.
* `-print-file-name=<any compiler-rt library>` to return the filename
  instead of the full path to the library.

Two regression tests are included.

rdar://77417317

Differential Revision: https://reviews.llvm.org/D101682