[CMake] How to build CMake so it works on an older Linux?

[Alexander Neundorf]

On 2018 M04 5, Thu 16:15:17 CEST suzuki toshiya wrote:
> Dear Eric,
> 
> # if anybody think "how C++11 environment should be prepared
> # on legacy GNU/Linux" is off-topic and should be discussed
> # in off-list, please let me know. I will do so.
> 
> Eric Wing wrote:
> > Thanks for the responses. Yes, I just need this to run on Ubuntu 12.04
> > (and some other old Linux's in that era). Yes, I think the probably is
> > the libstdc++ dependency.
> > 
> > As pointed out, it is really hard to get a newer compiler on Ubuntu
> > 12.04. I've been down this road before, and if memory serves, the gcc
> > bootstrapping process to get a newer compiler doesn't seem to work
> > with a compiler older than gcc 4.8. Same goes for clang, which also
> > weirdly relies on gcc 4.8 to bootstrap itself.
> 
> At least, gcc-4.6.3, the last official gcc for Ubuntu-12.04, could
> build gcc-4.8.5 manually (without shared libstdc++, so confused
> dependency could be avoided). And, I could build cmake-3.11.0 by it.
> Now I'm checking "make test".

I have recently built a gcc 4.9.5 on Centos 5, i.e. gcc 4.1. There were no 
issues after getting the configure flags right.

Alex