CentOS 5.11, with GCC 5.2 built on top. Includes very little aside from compiler. This is meant as a base image for creating more customized build images for various platforms.
The GCC 5.2 compiler herein is configured to output 64-bit code with the C++11 (GCC 5) ABI by default. You can control these with the following CFLAGS/CXXFLAGS:
where -m32 enables 32-bit compiling (but does not change uname!)
Code and more details are at:
Note on tag version:
<CentOS version>-<GCC version>-<build number>
Build number is increased for any changed rebuilds. It is reset to 0 if either CentOS version or GCC version changes. See the github repository for changes.