Robuta

https://github.com/meme/hellscape
GIMPLE obfuscator for C, C++, Go, ... all supported GCC targets and front-ends that use GIMPLE. - meme/hellscape
githubmemehellscapegimpleobfuscator
https://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg871974.html
bugcnewverifygimple
https://mail-archive.com/gcc-bugs@gcc.gnu.org/msg845018.html
risc vbugtreeoptimizationnew