<p></p>
<blockquote>
<p>I think such benefits can be used in some CI testing</p>
</blockquote>
<p>Yes, I agreed. Most of the features related to recent GCC version automatic checks may be implemented in CI process.<br>
Yes, definitely we can improve automatic checks in CI builds.</p>
<blockquote>
<p>There can be cases when one wants to replace a RPM installation with a git-branch</p>
</blockquote>
<p>As options, we can check GCC version used on RPM dist during compilation to make sure used not too old GCC.<br>
And print command that allows installing recent GCC.</p>
<p>For other coins, we can check GCC documentation. Maybe you will find something useful in the section "New Languages and Language specific improvements"<br>
<a href="https://gcc.gnu.org/gcc-9/changes.html" rel="nofollow">GCC9 release changes</a><br>
<a href="https://gcc.gnu.org/gcc-8/changes.html" rel="nofollow">GCC8 release changes</a><br>
<a href="https://gcc.gnu.org/gcc-7/changes.html" rel="nofollow">GCC7 release changes</a><br>
<a href="https://gcc.gnu.org/gcc-6/changes.html" rel="nofollow">GCC6 release changes</a><br>
<a href="https://gcc.gnu.org/gcc-5/changes.html" rel="nofollow">GCC5 release changes</a></p>

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