Compiler warning in GD2.CPP

[jackroffel]

Hi all,

I am getting the following compiler warning using Arduino 1.6.  Was not too worried about it until I realized this is the copy function used by LOAD_ASSETS() which I just starting playing with ...

GD2.cpp:297:43: warning: '__progmem__' attribute ignored [-Wattributes]
void GDClass*:copy(const uint8_t PROGMEM *src, int count) {

... is this of any concern?  Any suggestions to fix this?

Jack

[jamesbowman]

Hmm, I do not get that warning when compiling with 1.6.0 - it compiles completely clean.

What board are you compiling for? I am building for Arduino Uno btw.

[jackroffel]

James,

I am using a Arduino Mega 2560 and compiling with Visual Micro/Microsoft Visual Studio Community 2015. I could have been more specific - the Arduino version being used is 1.6.5.

If I compile the Walk example from within the actual IDE I do get the same error.

D:\Data\Dropbox\Arduino Sketchbook\libraries\Gameduino2\GD2.cpp:297:43: warning: '__progmem__' attribute ignored [-Wattributes]
void GDClass::copy(const uint8_t PROGMEM *src, int count) {

Jack

[jackroffel]

James,

I installed and compiled with 1.6.0, and you are correct. It compiles clean.

1.6.5 has some SPI transaction features that are beneficial to a GD2 project with multiple SPI devices, so I am reluctant to go back to 1.6.0.

Any ideas?

Jack

[jackroffel]

James,

I did a little more research. From forum.arduino.cc/index.php?topic=349789.0

"Progmem means nothing to the compiler (only the linker uses it). You cannot mark a function parameter as PROGMEM and expect anything different to the non PROGMEM version, its a data attribute not a type modifier, so it is completely ignored."

I removed the PROGMEM from the function parameter, and it compiles without any errors. Since the function explicitly uses "pgm_read_byte_near" the PROGMEM is redundant.

Jack