new SmartMatrix warnings with Arduino 2.0 or 2.1

[RichardFerraro]

Does anyone have an idea as to how to fix these warnings with latest SmartMatrix and Arduino 2.1.0 ? The code runs fine but the warnings are irritating.

Warnings are valuable and even with Warning set to "none" they still show up.

Warnings say: use copy-assignment or copy-initialization but I don't know how to do that

thanks



In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/Layer_Background.h:124,
from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:55,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/Layer_Background_Impl.h: In instantiation of 'void SMLayerBackground<RGB, optionFlags>::swapBuffers(bool) [with RGB = rgb24; unsigned int optionFlags = 0]':
C:\Glo\EvoTrip\platform.h:75:32: required from here
c:\Arduino2\sketch\libraries\SmartMatrix\src/Layer_Background_Impl.h:974:19: warning: 'void* memcpy(void*, const void*, size_t)' writing to an object of type 'struct rgb24' with no trivial copy-assignment; use copy-assignment or copy-initialization instead [-Wclass-memaccess]
974 | memcpy(backgroundBuffers[1], backgroundBuffers[0], sizeof(RGB) * (this->matrixWidth * this->matrixHeight));
| ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:50,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixCommon.h:139:16: note: 'struct rgb24' declared here
139 | typedef struct rgb24 {
| ^~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/Layer_Background.h:124,
from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:55,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/Layer_Background_Impl.h:976:19: warning: 'void* memcpy(void*, const void*, size_t)' writing to an object of type 'struct rgb24' with no trivial copy-assignment; use copy-assignment or copy-initialization instead [-Wclass-memaccess]
976 | memcpy(backgroundBuffers[0], backgroundBuffers[1], sizeof(RGB) * (this->matrixWidth * this->matrixHeight));
| ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:50,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixCommon.h:139:16: note: 'struct rgb24' declared here
139 | typedef struct rgb24 {
| ^~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:218,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Refresh_Impl.h: In instantiation of 'static void SmartMatrixRefreshT4<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::hardwareSetup() [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0]':
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Refresh_Impl.h:389:18: required from 'static void SmartMatrixRefreshT4<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::begin() [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0]'
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h:272:97: required from 'void SmartMatrixHub75Calc<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::begin() [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0]'
C:\Glo\EvoTrip\platform.h:10:17: required from here
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Refresh_Impl.h:680:88: warning: taking address of packed member of 'SmartMatrixRefreshT4<36, 192, 64, 2, 0>::timerpair' may result in an unaligned pointer value [-Waddress-of-packed-member]
680 | sourceAddress = (volatile uint32_t*) & (matrixUpdateRows[0].rowbits[0].timerValues.timer_oe);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~ ~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:219,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h: In instantiation of 'static void SmartMatrixHub75Calc<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::loadMatrixBuffers48(volatile rowDataStruct*, unsigned int) [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0; SmartMatrixHub75Calc<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::rowDataStruct = SmartMatrixRefreshT4<36, 192, 64, 2, 0>::rowDataStruct]':
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h:551:24: required from 'static void SmartMatrixHub75Calc<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::loadMatrixBuffers(unsigned int) [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0]'
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h:168:113: required from 'static void SmartMatrixHub75Calc<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::matrixCalculations(bool) [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0]'
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h:270:121: required from 'void SmartMatrixHub75Calc<refreshDepth, matrixWidth, matrixHeight, panelType, optionFlags>::begin() [with int refreshDepth = 36; int matrixWidth = 192; int matrixHeight = 64; unsigned char panelType = 2; long unsigned int optionFlags = 0]'
C:\Glo\EvoTrip\platform.h:10:17: required from here
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h:384:15: warning: 'void* memset(void*, int, size_t)' clearing an object of non-trivial type 'rgb48' {aka 'struct rgb48'}; use assignment or value-initialization instead [-Wclass-memaccess]
384 | memset(tempRow0, 0, sizeof(tempRow0));
| ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:50,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixCommon.h:159:16: note: 'rgb48' {aka 'struct rgb48'} declared here
159 | typedef struct rgb48 {
| ^~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:219,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixTeensy4Hub75Calc_Impl.h:385:15: warning: 'void* memset(void*, int, size_t)' clearing an object of non-trivial type 'rgb48' {aka 'struct rgb48'}; use assignment or value-initialization instead [-Wclass-memaccess]
385 | memset(tempRow1, 0, sizeof(tempRow1));
| ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from c:\Arduino2\sketch\libraries\SmartMatrix\src/SmartMatrix.h:50,
from C:\Glo\EvoTrip\Include.h:5,
from C:\Glo\EvoTrip\EvoTrip.ino:1:
c:\Arduino2\sketch\libraries\SmartMatrix\src/MatrixCommon.h:159:16: note: 'rgb48' {aka 'struct rgb48'} declared here
159 | typedef struct rgb48 {

[MichaelMeissner]

You get similar warnings using the Arduino 1,8,19 libraries. I posted this over at the smart matrix forum, and I did not get a reply to the thread:

• https://community.pixelmatix.com/t/s...58-beta-3/1346

[easone]

I just updated the library to fix these compiler warnings. Please download the latest version of the library here and see if it fixes the issue.
https://github.com/pixelmatix/SmartMatrix

[MichaelMeissner]

I just updated the library to fix these compiler warnings. Please download the latest version of the library here and see if it fixes the issue.
https://github.com/pixelmatix/SmartMatrix

Yes it fixes the issue. I rebuilt my animated 64x64 display on the Teensy 4.1, and it runs fine. You mentioned in an email to me (or posting on the smartmatrix forum):

However when you install the library through the Arduino library manager, I don't think it is using the latest version.

And that is indeed true. I did an update of the libraries and it did not show up. I needed to do a git clone to get the sources and copy them to the ~/Arduino/libraries/SmartMatrix directory.

Thanks for fixing this.

[embedded-creations]

Thanks for the fix @easone! I’ll do my best to get this merged and released next week.