Don't trigger a GCC poison pragma in avr-lib 1.8.0

Bug #1066575 reported by Craig Leres
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Arduino
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Bug Description

There are pragmas in several avr-libc 1.8.0 includes (avr/iom128.h, avr/iom162.h, avr/iomxx0_1.h, and avr/iomxx4.h) that poison SIG_USART1_RECV:

    #pragma GCC poison SIG_USART1_RECV

This means the SIG_USART1_RECV reference in HardwareSerial.cpp causes a compile error.

The attached patch removes the "#elif ... #error" code from the module.

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Craig Leres (leres) wrote :
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