I am building GCC from source for particular target. I would like to use latest GCC 7.2 release.
When I go to official GCC FTP GCC FTP, I can find only "gcc-7.2.0" release.
But, for example, in Arch Linux repository the latest GCC package is "gcc 7.2.1+20180116-1", which is, I guess, gcc-7.2.1.
So, the question is: where to find official latest source release of particular minor version of GCC?
GCC releases with a date are development snapshots. You're not looking at an official release; it's part way between 7.2.0 and 7.3.0.
You can find snapshots tagged in subversion. The website says they're in FTP too.