[PATCH 0/4] Oe-selftest for Clang, LLVM, LLD

[Deepesh.Varatharajan@windriver.com]

From: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>

This patch series introduces a test framework to run selftests for
target builds of Clang, LLVM, and LLD.

Summary of changes:
-Patch 1: Disable clang-tools-extra tests, as Clang's CMake cannot
          detect the llvm-bcanalyzer target.
-Patch 2: Enabled the necessary CMake flags for clang, llvm & lld tests
-Patch 3: Selftest script for Clang, LLVM, and LLD including exclude list
-Patch 4: Fix rust build failure by replacing target llvm-config with native

Testing:
1. The test suite has been successfully validated on x86-64, arm64, riscv64
and arm32 for all Clang, LLD & LLVM components.
2. Clang and LLD tests passed successfully on x86. LLVM tests are skipped
on x86 since it's broken. A follow-up bug will be filed and addressed.
3. Clang, LLVM & LLD all together ~80K tests are there and we currently
~250 tests to exclude list which are failing (0.32%).

Impact on build time:
These builds were executed in a controlled environment without poky-sstate
enabled.

Default(without changes):
|  Target   | Run 1      | Run 2      | Run 3      |    Average     |
| --------- | ---------- | ---------- | ---------- | -------------- |
|   llvm    | 22m18.441s | 22m31.905s | 22m23.718s |   22m24.688s   |
|   clang   | 30m09.774s | 30m22.680s | 30m15.312s |   30m15.922s   |
|   lld     | 1m26.994s  | 1m30.415s  | 1m29.006s  |   1m28.805s    |

With the testsuite changes applied:
|  Target   | Run 1      | Run 2      | Run 3      |    Average     |
| --------- | ---------- | ---------- | ---------- | -------------- |
|   llvm    | 23m32.104s | 23m45.887s | 23m38.157s |   23m38.716s   |
|   clang   | 30m31.402s | 30m46.198s | 30m39.445s |   30m39.015s   |
|   lld     | 1m29.845s  | 1m34.212s  | 1m31.925s  |   1m31.994s    |

Comparison:
|  Target   | Default Avg | With Changes Avg |     **Diff**     |
| --------- | ----------- | ---------------- | ---------------- |
|   llvm    | 22m24.688s  | 23m38.716s       |   +1m14.028s     |
|   clang   | 30m15.922s  | 30m39.015s       |   +0m23.093s     |
|   lld     | 1m28.805s   | 1m31.994s        |   +0m3.189s      |

Impact on tmpdir size:
| Metric                               | Size  |
| ------------------------------------ | ----- |
| Default target `tmpdir` size         | 74 GB |
| Target `tmpdir` size (after changes) | 79 GB |
| Difference                           | +5 GB |

Deepesh Varatharajan (4):
  clang-tools-extra: disable tests
  clang: Enable cmake flags for llvm, clang, lld tests
  oeqa/selftest/clang: Add oe-seltests for Clang/LLVM/LLD
  rust: Fix rust build failure

 meta/lib/oeqa/selftest/cases/clang.py         | 298 ++++++++++++++++++
 .../0042-guard-clang-tools-extra-test.patch   |  74 +++++
 meta/recipes-devtools/clang/clang_git.bb      |   2 +
 meta/recipes-devtools/clang/common.inc        |   1 +
 meta/recipes-devtools/clang/lld_git.bb        |   2 +
 meta/recipes-devtools/clang/llvm_git.bb       |   8 +-
 meta/recipes-devtools/rust/rust_1.93.0.bb     |   5 +-
 7 files changed, 387 insertions(+), 3 deletions(-)
 create mode 100644 meta/lib/oeqa/selftest/cases/clang.py
 create mode 100644 meta/recipes-devtools/clang/clang/0042-guard-clang-tools-extra-test.patch

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2.49.0