Upgrade to devtoolset-8-gdb done but gdb --version still 7.6

[umen]

Hey
i need to upgrade to gdb 8
i done :

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yum --enablerepo=centos-sclo-rh-testing install devtoolset-8-gdb
sudo yum --enablerepo=centos-sclo-rh-testing install devtoolset-8-gdb

installation is successful

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Installed:
  devtoolset-8-gdb.x86_64 0:8.2-3.el7

Dependency Installed:
  devtoolset-8-runtime.x86_64 0:8.1-1.el7

but when i do gdb --version im getting version 7.6

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GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7

what im missing here ?
thanks

[TrevorH]

If it's an SCL then you need to use scl enable ... to invoke it.

[umen]

Thanks , yeah i found i need to enable it to use it , the problem i need to enable it each time i want to use gdb 8 .
can you please explain me why SCL needs to be enabled each time ?
how can i make it permanent ?
and what is SCL in general
thanks

[TrevorH]

You need to enable it every time because that's how SCLs work. They're designed to be parallel installable copies of things that are already part of the distro at a lower version.

[chemal]

To permanently enable an SCL put something like

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. scl_source enable devtoolset-8

in your ~/.bashrc.