I'd recommend using yum localinstall rather than using the rpm command directly; that way you'll have the gcc package in your yum database so that it can keep track of updates. The command would just be:

yum localinstall /mnt/cdrom/CentOS/gcc-(whatever).rpm

Put in the spec file:

Requires: gcc > 7.3.0

See https://rpm-software-management.github.io/rpm/manual/dependencies.html

But I doubt that you really want to require gcc, because that is only needed when building packages and not in runtime.

For additional information see:

• https://docs.fedoraproject.org/en-US/packaging-guidelines/C_and_C++/
• https://docs.fedoraproject.org/en-US/packaging-guidelines/#_dependency_types

I'm going to make the assumption that you're on Fedora or some other Red Hat type of OS, since you're asking specifically about RPM packages.

With that assumption, the answer is 'yes', but with some caveats. On the connected machine, you can run dnf install --downloadonly gcc. This will download the gcc package and all of it's dependencies, but because of the --downloadonly option will not install them, it only download them to disk. You can them scp the downloaded packages over to the system not connected to the internet and install them.

First caveat - if your connected system has a different set of installed packages from your disconnected system, you may not download all dependencies that your second system needs. In other words, if gcc depends on package foo and that package is already installed on the connected system, it will not be downloaded. You will then still be missing a dependency on your disconnected system, since package foo isn't installed there.

Second caveat - if the systems are different versions of Fedora (e.g. connected in F38 and disconnected is F37), this solution will not work.

The easiest method by far is to make use of a binary build that's provided through a YUM repository. One such option would be to use the hop5.in repository. Specifically this page: gcc - Various compilers (C, C++, Objective-C, Java, ...). They're providing 4.8.2 which should work with CentOS 6.3 or 6.4. You might want to do an update prior:

$ sudo yum update

The other option would be to make use of the Developer Toolset, specifically the bundled version provided by Scientific Linux.

• http://linux.web.cern.ch/linux/devtoolset/

Following the installation instructions you'll basically do the following 2 steps:

$ sudo wget -O /etc/yum.repos.d/slc6-devtoolset.repo \
    http://linuxsoft.cern.ch/cern/devtoolset/slc6-devtoolset.repo
$ wget -O /etc/yum.repos.d/slc5-devtoolset.repo \
    http://linuxsoft.cern.ch/cern/devtoolset/slc5-devtoolset.repo

$ sudo yum install devtoolset-2

Update #1

The hop5.in YUM repository appears to have been removed, so the only recourse is to make use of the devtoolset method highlighted above.

Additional examples for installing via devtoolset are highlighted in this GitHub Gist: Installing gcc 4.8 and Linuxbrew on CentOS 6.