<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/121762>121762</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-repl] Issue running clang-repl as per instructions present in docs
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          anutosh491
      </td>
    </tr>
</table>

<pre>
    I did this (have cmake installed in my base env)
```
cd llvm-project
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DLLVM_ENABLE_PROJECTS=clang -G "Unix Makefiles" ../llvm

cmake --build . --target clang clang-repl -j 8
```
As mentioned here (https://clang.llvm.org/docs/ClangRepl.html)

I can fetch some stuff (limits, stdarg etc) but not everything (iostream, vector)

```
anutosh491@Anutoshs-MacBook-Air bin % ./clang-repl 
clang-repl> #include <iostream>
In file included from <<< inputs >>>:1:
input_line_1:1:10: fatal error: 'iostream' file not found
    1 | #include <iostream>
      |          ^~~~~~~~~~
error: Parsing failed.
clang-repl> #include <limits.h>
clang-repl> #include <stdarg.h>
clang-repl> #include <vector>
input_line_4:1:10: fatal error: 'vector' file not found
    1 | #include <vector>
      | ^~~~~~~~
error: Parsing failed.
```

Not sure if I am missing something obvious as I was just following the docs.
</pre>
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