What is `-fsee` in GCC?

Question

I was surprised to find that this flag did not give an error:

g++ -fsee foo.cpp

whereas -fasdf, as well as any other unknown flag, it gives an error. I can not find it in man gcc, as well as an online guide . Try online GCC 6.1.0 and 4.8 . It also works on 5.3.1 (my car).

It has an analogue -fno-see, like most flags.

Does anyone know what this flag is doing, or where can I find documentation for it?

Answer 1

From here

-fsee     (LCM).

, " ":

-fdump-rtl-see     .