<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/141757>141757</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Flang] man pages cannot be built
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            flang
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          pawosm-arm
      </td>
    </tr>
</table>

<pre>
    I'm trying to build man pages along with LLVM, clang and flang with CMake options as such:

```
    -DLLVM_BUILD_DOCS=ON \
    -DLLVM_ENABLE_SPHINX=ON \
    -DLLVM_ENABLE_PROJECTS="llvm;clang;flang;lld" \
 -DLLVM_ENABLE_RUNTIMES="compiler-rt;flang-rt;libunwind;openmp"
```

It fails like this:

```
FAILED: tools/flang/docs/CMakeFiles/docs-flang-man build/tools/flang/docs/CMakeFiles/docs-flang-man
cd build/tools/flang/docs && /usr/bin/cmake -E env ~/.local/bin/sphinx-build -b man -d build/tools/flang/docs/_doctrees-flang-man -q -t builder-man -D version=21 -D release=21 -W flang/docs build/tools/flang/docs/man
WARNING: no "man_pages" config value found; no manual pages will be written
flang/docs/index.md:40: WARNING: toctree contains reference to nonexisting document 'FIRLangRef' [toc.not_readable]
flang/docs/index.md:40: WARNING: toctree contains reference to nonexisting document 'FlangCommandLineReference' [toc.not_readable]
```

The build does not fail when I add the following line, thought it won't build flang manpages:

```
  -DFLANG_INCLUDE_DOCS=OFF
```

</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJy8VE1v4zYQ_TX0ZSBDHkm2c9DBtqytC8dZeJNubwZFjSV2KdIVKTt76W8vKCnbJFik6KWAAInifLyZN_O4tbLSRClL1izJJrxztWnTC78Z2wS8bSaFKb-nO4aLBlz7XeoKnIGik6qEhmu48IoscGV0BTfpatjvf7tnuAGhuK6A6xLO_Vd_ubnn3wjMxUmjLXALthM1i1Ys7J95OD7hCgAgyHyw0_ppt89O2cPmC4uyhwOwZPPWYHtYrffb05fPv-wOv39s8_n48Ot28-gjMUSlrg2L1j1UFq3P41upkiG-xHgb4Ph0eNzdb8cAwjQXqagNWvfiP3wqWXT6JnXJorW5kG4uDPFdiSxc7RycuVQWlPxG4Gppf9qMfLXbbzMWrcAZoyzDfICKeWmEP_Z9zaUiO_4LBiyeoZ4rhvl_d2XhSpQf-gPDOcM5MMw72zLMC6kZ5qLxNAdbIH2FvxjmU2UEVz_u7aWW-jkYpigo-kEKPs7EMD-VRriW6HVxwZ8QuMGR2uFPBldqrTSaRRnO_LklRdzSeP4Kbyr4l6RDG76ujofd4ZNnQBtgiA3Xp370_aAIo8-ygitXHcHZdD3r3rDhuuNq3JGbVAoKglsrnSMf9V0qqUt6njYli1Zx6FO9yuqG0n0qx6W20NKZWtKC_Dpqo-lZWue3szSia0g7YLjId8c919WRzgwXwJK1M2KqjTu1xEteKGJJ9r_g8Ak2pmm4LvdS0_HF6UNY73blsaZRd0pDFrQZdgduNWnYAS9LcLXvv1Lm5hEoqckrkatNV9UOpIOb0QwX48CMwtRwPTD5cxkKsny_Onw67Q6b_VO2_aFDef7OdFKmUXkX3fEJpbNFvIyj5SxOJnUaLSNR3J3pvFxykSAuIhRzjnMMEyRKZhOZYohJmOByFs2SOJnyeSzigs-iRVgkPBYsDqnhUk29YE1NW02ktR2ls3i2SBYTxQtStpdwxJFM9Grept4hKLrKsjhU0jr7Twgnnep1v2eHJdkrPRdc-_4WQ8fdpGtVWjt36ZuEOcO8kq7uiqkwDcO819HhFVxa8wcJ5-fIY_QDNcK8pvh3AAAA__9ICQX9">