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upgrading gcc -- do I need to rebuild everything?



The upgrade instructions say that after upgrading gcc (I went from 5.4.0 to 7.3.1):

"For upgrading to 1.2, you have to rebuild all packages, which will ensure that your system is fully optimized with the new gcc."

Before I do this, I want to make sure it is really necessary.  I did not change my subarch (something which was covered in those upgrade instructions).  I am staying with "generic_64".  So do I still need to rebuild all the packages on my system?

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