<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139523>139523</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [LLVM 20.1.4] building clang-tools-extra from source fails
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          dragon7307
      </td>
    </tr>
</table>

<pre>
    I have been attempting to compile llvm (tag: **llvmorg-20.1.4**) from source, yet it seems it failed due to an issue with **clang-tools-extra**.

For context: I have been trying to build llvm from source from the specified tag on a **debian** distribution on **x86** with **gcc 12.2.0** installed and, as far as I can tell, **all required dependencies**.

I generated the build files successfully with: `cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;compiler-rt;lld" -B build -S llvm` in the llvm-project directory to a build directory.

Then I ran from said directory `cmake --build build`, which is where compilation aborted.

Here's the relevant part of the log:

`[6696/7064] Building CXX object tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/LatencyBenchmarkRunner.cpp.o
FAILED: tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/LatencyBenchmarkRunner.cpp.o
/usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/dragon/dev/llvm-project/build/tools/llvm-exegesis/lib -I/home/dragon/dev/llvm-project/llvm/tools/llvm-exegesis/lib -I/home/dragon/dev/llvm-project/build/include -I/home/dragon/dev/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -fno-exceptions -funwind-tables -fno-rtti -std=c++17 -MD -MT tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/LatencyBenchmarkRunner.cpp.o -MF tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/LatencyBenchmarkRunner.cpp.o.d -o tools/llvm-exegesis/lib/CMakeFiles/LLVMExegesis.dir/LatencyBenchmarkRunner.cpp.o -c /home/dragon/dev/llvm-project/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.cpp
In file included from /usr/include/c++/12/bits/stl_algobase.h:64,
                 from /usr/include/c++/12/memory:63,
                 from /home/dragon/dev/llvm-project/llvm/tools/llvm-exegesis/lib/Assembler.h:18,
                 from /home/dragon/dev/llvm-project/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.h:18,
                 from /home/dragon/dev/llvm-project/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.h:17,
                 from /home/dragon/dev/llvm-project/llvm/tools/llvm-exegesis/lib/LatencyBenchmarkRunner.cpp:9:
/usr/include/c++/12/bits/stl_pair.h: In instantiation of ‘constexpr std::pair<_T1, _T2>::pair(std::pair<_U1, _U2>&&) [with _U1 = llvm::MCSection*; _U2 = int; typename std::enable_if<(std::_PCC<((! std::is_same<_T1, _U1>::value) || (! std::is_same<_T2, _U2>::value)), _T1, _T2>::_MoveConstructiblePair<_U1, _U2>() && std::_PCC<((! std::is_same<_T1, _U1>::value) || (! std::is_same<_T2, _U2>::value)), _T1, _T2>::_ImplicitlyMoveConvertiblePair<_U1, _U2>()), bool>::type <anonymous> = true; _T1 = llvm::MCSection*; _T2 = unsigned int]’:
/home/dragon/dev/llvm-project/llvm/include/llvm/ADT/MapVector.h:99:52:   required from ‘ValueT& llvm::MapVector<KeyT, ValueT, MapType, VectorType>::operator[](const KeyT&) [with KeyT = llvm::MCSection*; ValueT = std::vector<llvm::MCDwarfLineEntry>; MapType = llvm::DenseMap<llvm::MCSection*, unsigned int, llvm::DenseMapInfo<llvm::MCSection*, void>, llvm::detail::DenseMapPair<llvm::MCSection*, unsigned int> >; VectorType = llvm::SmallVector<std::pair<llvm::MCSection*, std::vector<llvm::MCDwarfLineEntry> >, 0>]’
/home/dragon/dev/llvm-project/llvm/include/llvm/MC/MCDwarf.h:237:24:   required from here
/usr/include/c++/12/bits/stl_pair.h:555:51: internal compiler error: Segmentation fault
  555 |           second(std::forward<_U2>(__p.second)) { }
      |                                                   ^
0x1afaeb6 internal_error(char const*, ...)
        ???:0
Please submit a full bug report, with preprocessed source (by using -freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-12/README.Bugs> for instructions.
[6717/7064] Building CXX object tools/llvm-exegesis/lib/X86/CMakeFiles/LLVMExegesisX86.dir/Target.cpp.o
ninja: build stopped: subcommand failed.
` 

</pre>
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