<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/147190>147190</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm-bolt configure failed because CMP0002 with cmake version >= 4.0 using BOLT-PGO.cmake
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            BOLT
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          pure-purpose
      </td>
    </tr>
</table>

<pre>
    As described in [CMake docs](https://cmake.org/cmake/help/latest/policy/CMP0002.html):
> Targets names created with [add_executable()](https://cmake.org/cmake/help/latest/command/add_executable.html#command:add_executable), [add_library()](https://cmake.org/cmake/help/latest/command/add_library.html#command:add_library), or [add_custom_target()](https://cmake.org/cmake/help/latest/command/add_custom_target.html#command:add_custom_target) are logical build target names. Logical target names must be globally unique

> Warning The OLD behavior of this policy was removed in CMake version 4.0. This policy must be set to NEW by a call to [cmake_minimum_required()](https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html#command:cmake_minimum_required) or [cmake_policy()](https://cmake.org/cmake/help/latest/command/cmake_policy.html#command:cmake_policy).

So when I use BOLT-PGO.cmake to configure llvm with -DLLVM_ENABLE_PROJECTS="clang;lld;compiler-rt;bolt", it failed with CMP0002. “compiler-rt" and "bolt" are mutually exclusive.
```
CMake Error at /usr/share/cmake/Modules/ExternalProject.cmake:2994 (add_custom_target):
  add_custom_target cannot create target "builtins" because another target
  with the same name already exists.  The existing target is a custom target
  created in source directory
  "/home/xxx/workspace/llvm-project-20.1.7.src/compiler-rt/lib/builtins".
  See documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  cmake/modules/LLVMExternalProjectUtils.cmake:367 (ExternalProject_Add)
  runtimes/CMakeLists.txt:90 (llvm_ExternalProject_Add)
  runtimes/CMakeLists.txt:166 (builtin_default_target)


CMake Error at cmake/modules/LLVMExternalProjectUtils.cmake:457 (add_custom_target):
  add_custom_target cannot create target "compiler-rt" because another target
  with the same name already exists.  The existing target is a custom target
  created in source directory
  "/home/xxx/workspace/llvm-project-20.1.7.src/compiler-rt".  See
  documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  runtimes/CMakeLists.txt:261 (llvm_ExternalProject_Add)
  runtimes/CMakeLists.txt:554 (runtime_default_target)


CMake Error at cmake/modules/LLVMExternalProjectUtils.cmake:457 (add_custom_target):
  add_custom_target cannot create target "install-compiler-rt" because
  another target with the same name already exists.  The existing target is a
  custom target created in source directory
  "/home/xxx/workspace/llvm-project-20.1.7.src/compiler-rt".  See
  documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  runtimes/CMakeLists.txt:261 (llvm_ExternalProject_Add)
  runtimes/CMakeLists.txt:554 (runtime_default_target)


CMake Error at cmake/modules/LLVMExternalProjectUtils.cmake:457 (add_custom_target):
  add_custom_target cannot create target "install-compiler-rt-stripped"
  because another target with the same name already exists.  The existing
  target is a custom target created in source directory
  "/home/xxx/workspace/llvm-project-20.1.7.src/compiler-rt".  See
  documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  runtimes/CMakeLists.txt:261 (llvm_ExternalProject_Add)
  runtimes/CMakeLists.txt:554 (runtime_default_target)


CMake Error at cmake/modules/LLVMExternalProjectUtils.cmake:457 (add_custom_target):
  add_custom_target cannot create target "check-compiler-rt" because another
  target with the same name already exists.  The existing target is a custom
  target created in source directory
  "/home/xxx/workspace/llvm-project-20.1.7.src/compiler-rt/test".  See
  documentation for policy CMP0002 for more details.
Call Stack (most recent call first):
  runtimes/CMakeLists.txt:261 (llvm_ExternalProject_Add)
  runtimes/CMakeLists.txt:554 (runtime_default_target)
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsmE1v4zYTxz8NfRlYkCnLtg4-2LH14CmcTdCk3aNBUWOLDSV6-ZI4374gJW2VbFKgu8YC7S6QQ8KXP-flN2NPmDHi2CAuSbom6WbEnK2UXp6cxvHJ6ZMyOCpU-bxcGSjRcC0KLEE0QNL11TV7QCgVNyTdELqorD0ZkqwIzQnNec0eMFL62P9OaF6hPBGaS2bRWELzk5KCPxOaX13fxnFMo8rWktDMi8QrkmzhnukjWgMNq9EA18gslvAkbOUtYGW5xzNyZ1khkdCFv_uVtnBV16wpCc1fqnY2Jf1-snr9akboVW-NFIVm-vmSpnSSb9vx-b1ghNK9HdwZq-q9DeG7pDUvhN-26dXbGTCNINVRcCahcEKW0O61WY1g1-0NV6F2xkKBcJSqYFI-g2vEJ4eeixaNj0w3ojnCfYVws9tAgRV7FEqDOoCthIGWLnhiBjTW6rEFt6X2EbURqoFpFEdwPzjdP2vQglXwYfsRimdgwJmUfoGk6xCofS0aUbt6r_GTExrLSwX5bfUvI_2eFVlHQbvfV9glbWs137OofzGL2lTdKXiqsIH_gzMI65vd_fj2fzdROOwDylVzEEfnEZGPdVva481u9_v1fvthtd5t97e_3vyyvbq_I8mGUMola44kWUtZkmTNVX0SEvVYW5KsCyUtodSXgrBwYEL2zaJvMEC2lCxikl0Nb1IKrCmBUNopBGRrZ10gD89cOiMeMbg0i7ufeNWytNVaaWAWCM2d0YTmpmIaBxG9VqWTaAjNt2eLumHyVqs_kNs2DCRZ0SybAqGLt-qn7YYAX-wBZ02jbNcW-_LxXjghrWiM96RAznzkWaNshbo7FQRDZGyFYFiNoeyASY2s9C4LY00EobrCH77UuheE8QURLBnK9d1ZNGCU0xyhFBq5Vfo57IfM5JWqfUjO5zOh-ZPSD-bEuF_x6R-f2riMaRxNonlkNG8B_CtVuRQFofnAxSio32H4LHI1NpZZX9sHpfuq7tIflmqlEUq0TEjjr175yr6zjD_4BNTKWNDIsbFtzR-ENsMs9DmtP-fUs_oqr79ZL94nN5nNvfSrM_tV6cs1iGrXWFEHtcDULkTfni1JVlnsL_vo7L9SYTKbeYkuZPsSD8xJOwCs7alf8PwVrk7T-eUwflWi_zWSaRSoDYrfg9y_Q4TOJt9KWZqGDtYd-fdQJhpjmZTjt2lrxV4Q9020tXwNiftJ2w9O29hYLU4n_-WNBrW3G90_xi5ovdvofmL3I2HHK-QP77S4nrMhLxf4QB3Kfaevhu3A8gMi188ko3KZlFmSsREuJ_N0soizbJGOquU0ycpsOs8WSTqZztlhNk-wZNmU8SSdT4tiJJY0pmk8j2eTJE3iNIoZKzPMJgvOiiymGZnGWDMhI--LnxhHwhiHy8l0PsnikWQFShP-jUSpn_J8StPNSC9D8gp3NGQay-DXZwUrrMTugJJ2MAt2s1tPaJ-tgGU7OvYTPEm2JNn4QR6c8SS-HDFHTsvly5n3KGzlioirukPrFWGE5sE1n43Ou8cl_TMAAP__fLxwPQ">