<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/95699>95699</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            macOS llvm toolchain No known class method for selector 'stringWithFormat:'
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          cosmin42
      </td>
    </tr>
</table>

<pre>
    llvm 18.1.7
macOS Sonoma 14.5
The cmake command that I used to build the toolchain:
```
cmake -DLLVM_ENABLE_PROJECTS=clang \
  -DCMAKE_BUILD_TYPE=Release \
 -DLLVM_CREATE_XCODE_TOOLCHAIN=ON \
 -DLLVM_ENABLE_RUNTIMES="compiler-rt;libcxx;libcxxabi;libunwind" \
  -G "Unix Makefiles" \
  ../llvm
```

When calling this function `[NSString stringWithString:@"x"];` from a .m file the build suceeds.
It fails however when calling the same function from the .mm file with the following error: 
```
error: no known class method for selector 'stringWithString:'
   15 |     [NSString stringWithString:@"x"];
```

This is the whole command:
```
CompileC /Users/cosminmihai/Library/Developer/Xcode/DerivedData/wtvr-brvodezqvflfuofupqgrmpccchmn/Build/Intermediates.noindex/wtvr.build/Debug/wtvr.build/Objects-normal/x86_64/Test2.o /Users/cosminmihai/wtvr/Test2.mm normal x86_64 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler (in target 'wtvr' from project 'wtvr')
    cd /Users/cosminmihai/wtvr
 /Library/Developer/Toolchains/LLVM18.1.7.xctoolchain/usr/bin/clang -x objective-c++ -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fno-color-diagnostics -fmodules-prune-interval\=86400 -fmodules-prune-after\=345600 -fbuild-session-file\=/Users/cosminmihai/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror\=non-modular-include-in-framework-module -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Werror\=return-type -Wdocumentation -Wunreachable-code -Wquoted-include-in-framework-header -Wno-implicit-atomic-properties -Werror\=deprecated-objc-isa-usage -Wno-objc-interface-ivars -Werror\=objc-root-class -Wno-arc-repeated-use-of-weak -Wimplicit-retain-self -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -Wduplicate-method-match -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wuninitialized -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wundeclared-selector -Wdeprecated-implementations -Wno-c++11-extensions -Wno-implicit-fallthrough -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -Winvalid-offsetof -Wno-sign-conversion -Winfinite-recursion -Wmove -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wrange-loop-analysis -Wno-semicolon-before-method-body -Wunguarded-availability @/Users/cosminmihai/Library/Developer/Xcode/DerivedData/wtvr-brvodezqvflfuofupqgrmpccchmn/Build/Intermediates.noindex/wtvr.build/Debug/wtvr.build/Objects-normal/x86_64/af3fcb34312c57c0f52879cdce924b91-common-args.resp -MMD -MT dependencies -MF /Users/cosminmihai/Library/Developer/Xcode/DerivedData/wtvr-brvodezqvflfuofupqgrmpccchmn/Build/Intermediates.noindex/wtvr.build/Debug/wtvr.build/Objects-normal/x86_64/Test2.d --serialize-diagnostics /Users/cosminmihai/Library/Developer/Xcode/DerivedData/wtvr-brvodezqvflfuofupqgrmpccchmn/Build/Intermediates.noindex/wtvr.build/Debug/wtvr.build/Objects-normal/x86_64/Test2.dia -c /Users/cosminmihai/wtvr/Test2.mm -o /Users/cosminmihai/Library/Developer/Xcode/DerivedData/wtvr-brvodezqvflfuofupqgrmpccchmn/Build/Intermediates.noindex/wtvr.build/Debug/wtvr.build/Objects-normal/x86_64/Test2.o
```

This is a minimum project that reproduces the problem https://github.com/cosmin42/BridgingSample
Note the same call below that fails in the second file.
https://github.com/cosmin42/BridgingSample/blob/53fd305511b2e3baf8d8a2b0ea32aa02a25fcf7b/Test.m#L15

https://github.com/cosmin42/BridgingSample/blob/53fd305511b2e3baf8d8a2b0ea32aa02a25fcf7b/Test2.mm#L15

Any idea of a workaround?
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzcWF9vI7kN_zTKiyDDo_HfBz8kcdymzZ_DJttcnwKOxJnRRSPNSho7uU9fSHKcOLt73SuKAt3FIrZJiqTInyhS4L1qDOKKTM_IdH0CQ2itWwnrO2Um_KSy8mWl9bajxWJUjOZkvCbj0w7E7R29s8Z2QIvJaJrJ9y1S0cETUmG7DoykoYVAL-ngUdJgaTUoHYlIg7VatKAMKU_zYjIb7_-nn1kPW19d_eP68eLm9Ozq4vGXT7d_uzi_vyPlWmgwDSXT8yxNKVufX5_-_eLx7PPl1frx_p-_XJBy_Qk1gsd3cnuF558uTu8vHn89v11fPN7f3l6d__X08oaU69ubr4X31j99vrm_vL6I1gnnwna90uiYC6Q806oSz8-HL1Cp_H0wO2Uk4fzI1b9Qwvlno57pNTxhrTT6DyKjEeGbGPZvxib_fWjRUAFaK9PQ0CpP68GIoKyhUXJ6dnN3F1xk-vTxoEKbCTHmkzHh_JlwTqZrUp6R2ZjWznYU6Kij0aWUppwwPwhE6UfZ7mWgNSjtaWt3uEVHd8eOIPXQ4ZszSW0kj7q95p0KbaLUVmu7i8vQOetIeUq_ueED11j6ZOzOUKHBe9phaK2ktXXUo0YRrKOEz7-1Xz5_jS0tppTMz2n892ej9P1s3McEKJ-2tWutPpyB7wH8PAPonBK--ezRecI3-dh1qgVF-OZKVQ7cC-GbNW5R2x4d4ZtfhZWYaE5tUa4hAOGbXdg6Vrmtlfj7l22t68HWQ_-lcV0vhGg7Q_jmLCaT8M2lCeg6lAoC-pGxykh83usYVXuhNVZD85F4W_2GInhmrOtAE755XsweZxPCN_foAx_Z728m6jnIdR3NKmhWQG1SrLbIBOFnhJ_F6I2g7zWOXk-aH8UDMUonf1Q8jg8MSvhCGRrANRhi_rOteUZe72zU_Y5O-PKABSrkv_E5S343HfevhSwuj-Ui18nRs3grcXwz-Chbpe-5dLHnb2ya1R16Dw0yjaYJbawI5XpMWS0VNMb6oIRnvrU7ZmxApozQg0TmA4inuBqEs6wC8RQcCGRadSq8KTGWCautY--0xVVWDho9691gos6Abgs6L1vMJuPxVzJQB3RZoJxMZ0kiYYR59F5Zw-I5zwL_FXhfJ_PnIFp8B9i7bGyUnduCVhJSyXnzd09EZo1A1qNjR35S9mCsYUka3CGeyrDaQYc7654yEyl7yFUoberHFxnLglONg771-WenvFemYbVCLZkyKijQ6nd0H_i9s8GGlx79sW2HYXCGRQ5lD9KKoUMT9ht_GIxDEC1UGlkMJWUPXwYbUH7bzxZBosuGVddrJVRgEGynRHSgRxfURwck9g4FRJ22-k0w5YENEbVZTaZFFNURg2oL7oOCJOGsDSyX8bQMnGAOe0x6B4_M1myH8ETZw8ExhwGUYR51nRfFPGyVCwNoJmP1zx5s0WkLEuUrM9PxWQUWVIdMog9uiPdFtC6HqD-iJF8orIMg2uNsVPFAReEeHJrQok-__E5l0cHEJocdbr20eE_UUKE-ovQQMxBS5PekLTgVs_aeooeEu64PLyx2Yon3hhhJ2YOwRqpoETT7yEv20n3JegdNB_tQ-xak3eXvtR0cEy04JqzxAUzYCwlrtuj2h-SVd0xVHwmVtfqYgmbojinRprYQPlIN0yqgA83MoD9oSYB5ZR9xfGtdQMNmExYsK_keFrjTyiBDu8fJoTvIv4JTIhyIh3QPRqLQ4FC-X_AO7hGIeDhtr4HKxbsoGD4HNP6Nc8BtDVqH1tmhaSmr9-ZBK4jQipiKR11YfWwtO3MwpUwqZszWtcdw2JlqzMes1BEGyByK4ZXY2S2mPHYdxERpK56YgD4MDhkMwbrUKmd39g4eFSAHJl5L1vYMDOgXr17BhJ2Kt4phFdbWHc7QAa_NAC4eRdiC0lAprcILTZ3VT9D3QF3WoionZcHFdC7G9ZQv5kshBS75pFoWLEbcGgau8SOHvqfs-npN2fU9ldijkWhEKrDXm5-pEZSUMY8ul6KjduNn2qQCysSPt7zsD9rj_7_d2x8YhoB2yqhueOvC04OAw95ZOcT7NI5LvbOVxo62IfQ-zWobwjeNCu1QxSb_EKwJjztzSjbKNHcQi3G2d2MDvk2ecRSlFWq7y-bytBonhCiB8cZMc-h-nv2PzPJNpW1F-GZa1rIcT6dFUXEsK6gXcgG8GiOUHGDMgU9rUc-rfdxGHeHlVTF9H63_qQMRiV-7cGpeqJII1NYUaOwMwdkhDq-bE7kq5bJcwgmuinmxmJazYrE4aVeyrGE-LZb1bFJIEPVczOuqnsMUxbQcF_JErfiYT8azYlYU4-VkMZIFzJclLxDGfFzN52Qyxg6UzoOddc2J8n7A1XI6Wy5PUtfk08MU5wZ3NDHzLH7i0qMUq4bGk8lYKx_8m5aggsZVfqRKb1eHUYze_MkHhE1Ef8gPCCeD06s_SFZ6r8kfbI93wjfJ63jg8662K_6vAAAA__-oMJ3y">