Wouldn't matter anyway; the anti-gun crowd has convinced most businesses of all sorts to post the red circle-slash over gun signs.
As I told the principal of my son's school, they've just advertised themselves as a free fire zone.
In Texas those signs are worthless. They just mean you can’t have an unlicensed handgun.
Exceptions are airport *buildings*, Federal buildings, any building with a metal detector at all entrances, courthouses, prisons, jails, police stations, and schools/colleges (without authorization).
Everywhere else, you're legal. Private property can post signs prohibiting CC on their premises, but you're only obligated to leave if they ask you to vacate the premises.
I assume you mean the school has been declared a gun free zone?
“As I told the principal of my son’s school, they’ve just advertised themselves as a free fire zone. “
In this age lacking of reason, that is all the principal needs to have the authorities pick you up for threatening to go postal on the school.
Don’t laugh, it could happen.