The Free On-line Dictionary of Computing (30 December 2018):

source code management
code management
source code control

    The use of software systems to help program
   developers keep track of version history of source code
   modules as well as releases, parallel versions (code
   branches), etc.  The free CVS was an early example, mostly
   replaced by Subversion and git.  Perforce is a powerful
   commercial product.  SCCS was once popular on Unix and
   VSS is Microsoft's offering.

   (2011-12-16)