<p>C++17 equivalent of previous Autoconf check that we got from the <a href="https://www.gnu.org/software/autoconf-archive" rel="nofollow">Autoconf Archive</a>, which has since been factored into two m4 files:</p>
<ul>
<li><a href="https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html" rel="nofollow">ax_cxx_compile_stdcxx</a></li>
<li><a href="https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_17.html" rel="nofollow">ax_cxx_compile_stdcxx_17</a></li>
</ul>
<p>I didn't look to see if C++11 is mentioned in any docs and update them, feel free to modify to this PR to fix them, or mention in comments and I'll try and fix.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/geany/geany/pull/2862'>https://github.com/geany/geany/pull/2862</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Update C++ compiler check to require C++17</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/2862/files#diff-49473dca262eeab3b4a43002adb08b4db31020d190caaad1594b47f1d5daa810">configure.ac</a>
    (2)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/geany/geany/pull/2862/files#diff-c67e1cc180c5418de3a76dbfd77cd9020b7d40966cbd75c56f31542edb3aa57e">m4/ax_cxx_compile_stdcxx.m4</a>
    (962)
  </li>
  <li>
    <strong>D</strong>
    <a href="https://github.com/geany/geany/pull/2862/files#diff-bb66e5d2bb2d8025f29f600e211968641555dc72630bd859287761e7ff6a017c">m4/ax_cxx_compile_stdcxx_11.m4</a>
    (142)
  </li>
  <li>
    <strong>A</strong>
    <a href="https://github.com/geany/geany/pull/2862/files#diff-2fba1697f4a80bd2e8e61956a7afcc34f8415e62a4f0bef78a8f2a10b2edb995">m4/ax_cxx_compile_stdcxx_17.m4</a>
    (35)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/geany/geany/pull/2862.patch'>https://github.com/geany/geany/pull/2862.patch</a></li>
  <li><a href='https://github.com/geany/geany/pull/2862.diff'>https://github.com/geany/geany/pull/2862.diff</a></li>
</ul>

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