register deprecated error with clang

Created by: Slechtvalk

Hi, I got this error when compiling ArduinoJSON on FreeBSD 10.2 (CLang) 👍

/opslag/home/oldenburgh/techniek/Variosystem/software/swexternals/software/extern/json/ArduinoJson/src/Internals/JsonParser.cpp:19:3: error: 'register' storage class specifier is deprecated [-Werror,-Wdeprecated-register] register const char *ptr = skipSpacesAndComments(_readPtr); ^~~~~~~~~ 1 error generated.

I think the solution is one of these

1. drop the register keyword.

2.use a pragma to turn of the error on clang, like #pragma clang diagnostic push

pragma clang diagnostic ignored "-Wdeprecated-register"

< json code >

pragma clang diagnostic pop

Greetings,

Ewout Boks