<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/95347>95347</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Enabling libcxx runtimes breaks running clang unit tests on MacOS
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++,
            build-problem
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          mizvekov
      </td>
    </tr>
</table>

<pre>
    My clang development setup works fine without libcxx. However, when I enable it:
```json
"LLVM_ENABLE_RUNTIMES": "libcxx;compiler-rt;libcxxabi;libunwind"
```

I start getting a bunch of errors when building the `check-clang` target:
```
[439/440] Running the Clang regression tests
llvm-lit: /Users/mizvekov/Repos/llvm/1/llvm/utils/lit/lit/llvm/config.py:508: note: using clang: /Users/mizvekov/Repos/llvm/1/build/rwd/llvm/bin/clang
llvm-lit: /Users/mizvekov/Repos/llvm/1/llvm/utils/lit/lit/util.py:473: note: using SDKROOT: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.5.sdk'
dyld[51373]: weak-def symbol not found '__ZnwmSt19__type_descriptor_t'weak-def symbol not found '__ZnamSt19__type_descriptor_t'
```

And so on.

Full list of broken tests:
```
Failed Tests (28):
  Clang-Unit :: AST/./ASTTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: AST/Interp/./InterpTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: ASTMatchers/./ASTMatchersTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: ASTMatchers/Dynamic/./DynamicASTMatchersTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Analysis/./ClangAnalysisTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Analysis/FlowSensitive/./ClangAnalysisFlowSensitiveTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Basic/./BasicTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: CodeGen/./ClangCodeGenTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: CrossTU/./CrossTUTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: DirectoryWatcher/./DirectoryWatcherTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Driver/./ClangDriverTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: Format/./FormatTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: Frontend/./FrontendTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Index/./IndexTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: InstallAPI/./InstallAPITests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Interpreter/./ClangReplInterpreterTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Interpreter/ExceptionTests/./ClangReplInterpreterExceptionTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Lex/./LexTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Rename/./ClangRenameTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: Rewrite/./RewriteTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: Sema/./SemaTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: Serialization/./SerializationTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: StaticAnalyzer/./StaticAnalysisTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Support/./ClangSupportTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Tooling/./ToolingTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: Tooling/Syntax/./SyntaxTests/failed_to_discover_tests_from_gtest
 Clang-Unit :: libclang/./libclangTests/failed_to_discover_tests_from_gtest
  Clang-Unit :: libclang/CrashTests/./libclangCrashTests/failed_to_discover_tests_from_gtest
```

Everything else works fine, and I can build the `check-cxx` target successfully.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy0V0uP4jgX_TVmY1UUHMJjwQKKyvehrupuATXTmk3kJBdw49iR7fDoXz-ykwDVz2mNR0LB99g-x9e-eRyqNdsJgCmK5yhe9Ght9lJNS_blCAd57GWyuExfLjjnVOxwAUfgsipBGKzB1BU-SXXQeMsE4BMze1kbzFmWn88B_r88wREUIo_4tAeBlxgEzThgZlA0Q-EChTM0DJvfZy1FCxHy_PzHS_r0fjZ_fkpXr-83y5enNSIERTOMCGn4UTTPZVkxDupBGRTNG5hmrGnX4sREYWe9FWpDd11ibagyeAfGMLHDFGe1yPdYbjEoJZVuFp7VjBe23-wBo2GY7yE_PLgdQcMQG6p28J2U2jCeD6IJIslgEKJ4gVe1EB3Xo9tUBTsFWjMpsAFtdDOP82P5wN1WYUSSVw1KI5J0B4NIsoJKWsiORCTp35q1Ydz1MHO7Nl25FFu2C6oLimZxOLbsQhqw_7W262rS-h1Rtz2IJOpU3DoyJqyaI_tP8rFYk8ZgFH2bxnrxbvXhw6ZRGyGSzKqKs5waJoWl-pTLAgJaVYgkj1IYEMbCi6bAbdUmHzk1W6lKi7_Q_MP6U1C10Fcj14t3t0H9QRAHujhYWZd5ceEFiudxPxpFKF7YJZ2AHh4K2GJ9KTPJ7drxVtaisItN07_EqVyb_iRNzaWCtACdK1YZqVKDyOiXk-lPJv_kbpiJAmuJpQju0aTmHHOmjb0rMiUP0JXpDwo-oYxDgTd2DEZkTMaITK6DcVP0D6-CGWzRaIZn6w0iSWAPab1x8xBJto4mNTItmM7lEVTqZNOtkmW6s-1fMS6FAVW11E3gi_2FmnzfVHC77g75fYVfCSwugpYsb6XayLeioPyiWZePG9BhnvkTLk9rEJoZdoTv6b0Z4EN8TvV1-1zbB-mjLOB_IO4TaCEv7EpqvXnt2JvIB_GCKciNVJc_m-rpquor2IuUYsergOtuEC_3YCJVSU1L3gR-eJV7GRQdcxv62I-lKOB8fRoVcPZDqg3lfPZxeWXuAD_09qmpwLw9yBVU_K7Lv9LTOYfKvqs76h9JfzPw36zh-Xo-z35OZwWClvB2-RbxUqorOClmOvY28sK8hpK2tLbpiVMxytkX9wV2Jb_DfOz32lDDcvci-XKt2DvQ09tsXVeVVOb-XFvIB_tGSs7ErmVvI7_E64swtKv1JvAhYC2Y--JviLvQS_3ccT8qqvf3D4au703HP1b77sfw0xHUxeytlQCu4c7nWj9LRYGXOKetN_zKGJ7PN1uIdZ3noPW25vwS9IppVEyiCe3BtD_qj0kc9if93n5KhhkJ43BLhv1iTMcERqSIyGicUToKB9txj01JSAbhsB-F0SDq9wPIJ_kQwiibkEEcDkM0CKGkjAfWMwVS7XpM6xqmkzgajHqcZsC1M_mNgUZk7n4EkUdEiEvjoVIy41BaNF701NR5tqzeaTQIrQXQN3LDDIfpkzX0do8a841VLQwrQeNMAT1oG4urqcS1PU53BlgK7NxSr1Z8ujemcnaCJIgkO2b2dRbksrwZQLeQSsnPkNu7zmVmz7hJ7jglfwcAAP__Ua-jgQ">