The goal is to get the SVN versions tagged with the appropriate releases but until then, internally the EDISON branch is locked so it is should be considered stable.
Mysql is internally compiled for each platform but we try to maintain options as close to the Mysql binary releases as possible. Usually these are just pulled straight from the options in the rpm spec files they publish.
Code:
CFLAGS="-O3" CXX=gcc CXXFLAGS="-O3 -felide-constructors -fno-exceptions -fno-rtti" ./configure --enable-local-infile --enable-assembler --with-extra-charsets=complex --enable-thread-safe-client --with-readline --with-mysqld-ldflags=-all-static --libdir=/opt/zimbra/mysql-$(MYSQL_VERSION)/lib --prefix=/opt/zimbra/mysql-$(MYSQL_VERSION)