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By jork
#68709 I have been searching and trying to figure this out, but I can't seem to find an answer. I am trying to use "strcasestr" with the ESP8266 in Arduino IDE. When compiling, I am getting this error "undefined reference to `strcasestr'". This error does not occur when using "strstr", only "strcasestr". This error also does not occur when I select Arduino boards, only occurs on ESP8266 boards.

I have checked the ESP8266 strings.h file and the "strcasestr" entry exists in it. I have also tried this solution https://stackoverflow.com/questions/9935642/how-do-i-use-strcasestr, but it doesn't seem to work either.

Could anyone kindly assist on the issue.