gcc linked to ccache with installed version

[RR]

I noticed that my installed version of gcc is linked to ccache. When I
type gcc on the command line, I
get "gcc: no input files". When I type ccache, I get the ccache usage
message. But when I
type "ccache gcc" I get "gcc: no input files". It seems that gcc is
engaging ccache with the option "gcc"
appended somehow. I would like to know how the link name, gcc, engages
ccache with the gcc option specified.