Uninstalling Gcc

How to change the default version of gcc man page?

I have found the solution:

1. Find the location of gcc-6 man page:

   $ locate gcc-6 | grep 'man'             
   /usr/share/man/man1/gcc-6.1.gz            
   /usr/share/man/man1/x86_64-linux-gnu-gcc-6.1.gz 
   

   so the location of gcc-6 man page is /usr/share/man/man1/gcc-6.1.gz

2. Remove the file /usr/share/man/man1/gcc.1.gz if it exist:

   $ sudo rm /usr/share/man/man1/gcc.1.gz 
   

3. Create a symbolic link to /usr/share/man/man1/gcc-6.1.gz:

   $ sudo ln -s /usr/share/man/man1/gcc-6.1.gz /usr/share/man/man1/gcc.1.gz
   

Then run comman:

$ man gcc

You will see the man page version of gcc has changed to gcc-6.

Sorry for my English.

I installed GCC 5.2 from source and I don't know how to uninstall it on Ubuntu 15.04

I believe you don't need to revert to the system compiler; it is a matter of path. Or set up your $PATH appropriately. Use /usr/bin/g++ for the system compiler, and probably /usr/local/bin/g++ for the compiler you have built from source code from GCC

BTW, you probably could use your GCC 5.2 for almost all your future builds

It depends how you have configured it.
You should have configured it with ../gcc-5.2/configure --program-suffix=-my-5.2 then you would use g++-my-5.2 instead of g++

Try to type g++ -v (i.e. probably /usr/local/bin/g++ -v) to understand how it was configured.

You probably could remove the gcc and g++ binaries under /usr/local/bin/ and several other files and directories under /usr/local/ (but be careful).

^{Indeed, GCC does not support make uninstall}

Can I remove gcc compiler after tensorflow installation?

Provided that tesnorflow itself does not invoke gcc during operation, it should be safe. Unless shared libraries tensorflow depends on are removed with it (can happen if you system packages them as part of the gcc package -- e.g. libstdc++, libgomp, etc).

I'd recommend checking tensorflow executables with ldd -r to find out (after removing gcc -- or query the package manager whether any of the output libraries is owned by the gcc package).

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