<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60888>60888</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Cannot link to libLLVM due to command line parser static initialization
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    The exported `libLLVM.dylib` cannot be used as is because it creates multiple static initializers for `cl::opt<T>` values that may interfere with a command line application that links to the library. I suspect that the macOS linker may have liked multiple objects that have the static initializer, leading the the requisite error.  Fixes may include allowing duplicate identical initializers to exist without error, or to create `libLLVM` by first passing through all object files to `llvm-link` before generating the native binary as this would fix any single instance problems with static initialization.  I believe that `lld` may properly handle these duplicate object files, but will know more after a few tests. Error as reported:

```
: CommandLine Error: Option 'aarch64-enable-ccmp' registered more than once!
LLVM ERROR: inconsistency in registered CommandLine options
```

Repo steps:

Create `libLLVM` by compiling LLVM with `LLVM_BUILD_LLVM_DYLIB=ON` and then create a binary that links to LLVM using something similar to the following CMake file:

```
cmake_minimum_required(VERSION 3.24)
project(bug_sample)

set(CMAKE_CXX_STANDARD 20)
set(LLVM_ROOT /opt/latest-apple-llvm)
set(LLVM_INCLUDE_DIR ${LLVM_ROOT}/include)
set(LLVM_LIB_DIR ${LLVM_ROOT}/lib)

find_package(Boost 1.80 REQUIRED COMPONENTS filesystem program_options)
link_directories(${LLVM_LIB_DIR})
include_directories(${LLVM_INCLUDE_DIR} ${Boost_INCLUDE_DIRS})
add_executable(bug_sample main.cpp)
target_link_libraries(bug_sample LLVM clang clang-cpp Boost::filesystem Boost::program_options)
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJx8VV1v6zgO_TXKC5HAUb4f8tDmAwg2bXbT3ou7T4YsM7Y2suSV5LaZXz-gnGTcO-0ArWJbJHV4eEgJ71VhEJds8sgm655oQmnd0il5roQ79zKbX5avJQJ-1NYFzIFNE62y_f7n0yC_aJWxaQJSGGMDZAiNxxyEB-UhQykaj6ACSIcioIeq0UHVGsEHEZQEZVRQQqs_0Hk4WUfBpWajBzZ6sHVgo9UrG23ohDehG_QQShGgEhdQJqA7oUN4V6EEAdJWlTA5aGUQRF1rJUVQ1rQuWpmzh2AhlAhaZU64ywB24BtfowytEe1VQh5eojm6eFAp3sjjjPlf6G32P5ThiiYakOvfc2J8BRpFrkwRLejf4f8b5VVAQOesGwBs1QdRE5OSuskRhNb2nZzyps0DQeVogpJCf-YsWMAP5UNkwTahDUrnWkebLfGdmhGX2QVOyvkANVU_YnO2KUo695obnJTGGJ5c9VvVJ0qiM56sQyjQoBPhlpkRQb0hZMoId6H6h1J5eLeNzuGkPkCYC9BRGkEZH4SRCLWzmcbKtxX8nb1YvAHADjLUCiPHIrRwcgJChNXO1ug0VcnkOhLsscNaNxkiJWuIKa3hbOw7VJSIOAV0IOCE7xDQBz-ADXFISThsNU-CTNYsua3T5PrXvo4eYNWqb0_ii-708VBHATI-E8LJcjruoxGZxr6UVc34DBwWygd0pC3CEkphwBqJjA_b2FQy2ByPhyMFVEZa48nFSFJLN0AXgY0H-6_RxvWItQUfsPa_5bb6RjDSVrXSVO4IKZaMTRN6SR9_7PbrND6u_7vfPbLR-vBMftSPoURzk6G4CeRzT8aITVSitxWGMj6pSmnhbj17sreeWD2JM8aS_nNZZCXOmFbKqKqp0th2DnPG5z83x5fd4RlGAz5mfNFa186SVBifZ02RelHVGu-b7eqRtldPD__apKtfv9KX14fn9cNxDTy5W7Y2kYrj4fAKjG9pjvGtpvkX-jSYsE8N9ZXL7nm1_7HepOvdERgfs9njPRKbrRnfXgfEV7773eP3fjSmPydzUiZPayHPokDG54_W-gDDwTyB4-Y_P3bHzRpWh6d_H543z68vbQNdfMCKWq5wokpvGruFpWqmuXIog3WK2m3egXJFF9FcHa65fO_TYYPN1tfEItDu1ks3psjzFD9QNoH67FMxoRLKDGRd342DcAWGNAJvr4QWQscnKlNqYYp27cu6hgihvaM6vHS-fkfRXaC9fDnKF6OF6OFyOJ1NF3y0mPNeuZzMF3ImJ3M5y2ZiPBmdxvOZlDjG6WQ6X8hxTy15wkcJ5wlPhqOEDzjKBCfDRSL4UM7GQzZOsBJKD0hjA-uKnvK-weU0mc_nPS0y1D7e9ZwbfIe4yTinq98t46DPmsKzcaIVzcJ7lKCCxuWqveeJMmrM64iAvMF42XSv4Fo4j-7rsd5rnF6WIbTTh28Z3xYqlE02kLYiucb-iD_9e2NuI1bP-Dbm8mcAAAD__7jK3zE">