On 11/23/2015 04:33 PM, Michael Eager wrote: > Hi -- > > I'm trying to build an application on CentOS 7 which > can run on older versions of CentOS. I'm running into > problems with versioning of memcpy in Glibc. Executables > built on CentOS 7 require memcpy from glibc-2.14, which > causes the program not to load on systems with older > versions of glibc. > > My online search suggests to add an asm() with a .symver > option to select memcpy from glibc-2.2.5 in each of the > source files which reference memcpy(). This isn't practical > with a program with tens of thousands of source files. > > Does anyone have a reasonable solution? IMO you should really be building your app on an older Centos version (5 or 6). Then your binary should run everywhere, though it may sometimes require installing a -compat package. An alternative is to link everything statically. Not as good a solution, as it introduces security concerns.