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Way to test 'newlib' on Arduino IDE for ESP8266 #3120

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@electronicsguy

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@electronicsguy

Hello,
As mentioned here: newlib, the libc for newlib was merged sometime back in 2016. However, I am unable to use "test_newlib" located here: test_newlib.

It still gives me the error:

C:\...\AppData\Local\Temp\arduino_build_956035\sketch\test_newlib.ino.cpp.o: In function `TEST_FUNC__27':

C:\...\test_newlib/test_newlib.ino:30: undefined reference to `sscanf'

How do we use the newlib and in particular sscanf() within Arduino IDE for esp8266?

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