help with gcc on opensuse leap 15

["KW via gcc-help" <gcc-help@xxxxxxxxxxx>]

I was wondering after compiling gcc why when I type in 'which gcc' it
still defaults to /usr/bin/gcc and not /usr/local/bin/gcc.

  If I compile gcc with a different prefix do you know if gcc will still
be detected by other programs looking for it?

Do you know how to go about changing the default in OpenSuSE Leap 15? Is
it the same for every linux distro?

KW