gitignore binary files that have no extension

Question

How can binary files be ignored in git using the .gitignore file?

Example:

$ g++ hello.c -o hello

The

Answer 1

Old thread, but still relevant. I changed the makefile so the resulting binary file after linking has the name [filname].bin instead of only [filname]. Then I added *.bin files in the gitignore.
This routine fulfill my needs.