I have installed the GLIBCXX_3.4.21 but it always reports libstdc++.so.6(GLIBCXX_3.4.21)(64bit) is needed during the RPM install

[Xi Ruoyao]

On 2018-10-10 02:34 +0000, Ling, Darcy (NSB - CN/Qingdao) wrote:
> 1.     When I install a RPM package, it always reports
> "libstdc++.so.6(GLIBCXX_3.4.21)(64bit) is needed by".
> # rpm -ivh cnet-c-0.1.0-18.9.x86_64.rpm
> error: Failed dependencies:
>         libstdc++.so.6(GLIBCXX_3.4.21)(64bit) is needed by cnet-c-
> 0.1.0-18.9.x86_64
> 
> 2.     Based on the search, I use following commands to check the
> dynamic libstdc++.so installation.
> The version to GLIBCXX_3.4.22 has been installed and the
> libstdc++.so.6 points to libstdc++.so.6.0.22.
> /usr/lib64/libstdc++.so.6 -> libstdc++.so.6.0.22
> 
> Any suggestions how I should do to solve the dependency issue? And
> whether I need to downgrade the GLIBCXX_3.4.22 to GLIBCXX_3.4.21?

I don't think so.  libstdc++.so.6.0.22 provides symbols with version
GLIBCXX_3.4.21.  The GLIBCXX_*.*.* stuff ("versioned symbol") is mean
to solve this "dependency hell" problem.

I'm not familiar with rpm. But I can guess that libstdc++.so.6.0.22 is
not installed by rpm and an old libstdc++.so version is still
registered in the rpm database.

What would `rpm -q libstdc++` output?
-- 
Xi Ruoyao <xry111@mengyan1223.wang>
School of Aerospace Science and Technology, Xidian University