Compile Error With Adafruit_GFX.h

Using Arduino Programming Questions
1

My sketch #includes Adafruit_GFX.h that have the following on Lines 12-16
#define adagfxswap(a, b) { int16_t t = a; a = b; b = t; }

  #if !defined(ESP8266)
    #define swap(a, b) adagfxswap(a, b)
  #endif

I am getting the following compile error:

 ```

Arduino: 1.8.9 (Windows 10), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"

In file included from C:\Users\Acer\Documents\Arduino\libraries\Waveshare_ILI9486\src\Waveshare_ILI9486.cpp:25:0:

C:\Program Files (x86)\Arduino\libraries\Adafruit_Display/Adafruit_GFX.h:12:26: error: expected unqualified-id before '{' token

#define adagfxswap(a, b) { int16_t t = a; a = b; b = t; }
^

C:\Program Files (x86)\Arduino\libraries\Adafruit_Display/Adafruit_GFX.h:15:22: note: in expansion of macro 'adagfxswap'

#define swap(a, b) adagfxswap(a, b)
^

C:\Users\Acer\Documents\Arduino\libraries\Waveshare_ILI9486\src\Waveshare_ILI9486.cpp:742:7: note: in expansion of macro 'swap'

void swap(int16_t &x, int16_t &y)
^

C:\Users\Acer\Documents\Arduino\libraries\Waveshare_ILI9486\src\Waveshare_ILI9486.cpp:743:2: error: expected unqualified-id before '{' token

{

^

exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.

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The Adafruit library well written and established.  What might be my problem.

Thanks

Sadster
2

Hello, please make sure that the Adafruit_GFX.h library has been installed properly.

3

What happens when you compile an example sketch?

4

Where did you get the library from? That is not from the current version of Adafruit_GFX, and adagfxswap was relocated to the cpp file over seven years ago:
https://github.com/adafruit/Adafruit-GFX-Library/commit/f5ec45e42b7216ca3fa34eb08ec052071d672422

1 Like
5

Your include syntax is incorrect

6

Your are most likely correct! The library is indeed from years ago. I will try to get the updated library.

7

Aha! All worked fine once updated library was installed!

8

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