[libcxx-commits] [libcxx] [llvm] [libcxx][Github] Add generic-llvm-libc config to CI (PR #193822)

[Aiden Grossman via libcxx-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/193822

Add the generic-llvm-libc config for CI so that we can ensure we do not regress the config and easily test changes as we do more work.

Only run libcxx/libxxabi tests for now as libunwind fails to build due to a missing dl_iterate_phdr implementation. It technically passes when we enable the stub implementation, but we should have a reasonable implementation before actually enabling.

>From f2715bba45ec790c2856e14eabd360d3176ed2ef Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Thu, 23 Apr 2026 18:56:44 +0000
Subject: [PATCH] [libcxx][Github] Add generic-llvm-libc config to CI

Add the generic-llvm-libc config for CI so that we can ensure we do not
regress the config and easily test changes as we do more work.

Only run libcxx/libxxabi tests for now as libunwind fails to build due
to a missing dl_iterate_phdr implementation. It technically passes when
we enable the stub implementation, but we should have a reasonable
implementation before actually enabling.
---
 .github/workflows/libcxx-build-and-test.yaml |  1 +
 libcxx/utils/ci/run-buildbot                 | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/libcxx-build-and-test.yaml b/.github/workflows/libcxx-build-and-test.yaml
index 83f8f89ac5fe2..c5421addefa30 100644
--- a/.github/workflows/libcxx-build-and-test.yaml
+++ b/.github/workflows/libcxx-build-and-test.yaml
@@ -144,6 +144,7 @@ jobs:
           'generic-hardening-mode-extensive-observe-semantic',
           'generic-hardening-mode-fast',
           'generic-hardening-mode-fast-with-abi-breaks',
+          'generic-llvm-libc',
           'generic-merged',
           'generic-modules-cxx17-lsv',
           'generic-no-exceptions',
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
index cbb0846dfc7d1..44507f05011fa 100755
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -466,7 +466,19 @@ generic-llvm-libc)
     # Ensure we have the builtins archive built as we pass it in explicitly in
     # the test config.
     ninja -vC "${BUILD_DIR}" libclang_rt.builtins-x86_64.a
-    check-runtimes
+
+    # Manually run only libcxx/libcxxabi tests as we currently cannot build
+    # libunwind due to a missing dl_iterate_phdr implementation.
+    # TODO(boomanaiden154): Remove this once we can build libunwind and pass
+    # the tests.
+    step "Building libc++ test dependencies"
+    ninja -vC "${BUILD_DIR}" cxx-test-depends
+
+    step "Running the libc++ tests"
+    ninja -vC "${BUILD_DIR}" check-cxx
+
+    step "Running the libc++abi tests"
+    ninja -vC "${BUILD_DIR}" check-cxxabi
 ;;
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