How to get rid of "warning: initialization from incompatible pointer type [-Wincompatible-pointer-types"]

pagemaker · April 13, 2021, 1:15pm

After building I get these warnings:
/Users/janhkila/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-spi.c: In function ‘spiTransferBytesNL’:
/Users/janhkila/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-spi.c:922:39: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
uint8_t * last_out8 = &result[c_longs-1];
^
/Users/janhkila/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-spi.c:923:40: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
uint8_t * last_data8 = &last_data;

What can I do to silence this warning?

maxgerhardt · April 13, 2021, 6:30pm

will be automatically fixed once a new stable Arduino-ESP32 version releases, per HAL/SPI initializes from incompatible pointer type. · Issue #5039 · espressif/arduino-esp32 · GitHub, new code is this
if you want to silence the warning locally, you can directly fix it at the source ( /Users/janhkila/.platformio/packages/framework-arduinoespressif32/cores/esp32/esp32-hal-spi.c), this fixes it globally for all projects
You can try and pass the -Wno-incompatible-pointer-types (docs) in the build_flags for a per-project fix.

wewowo2125 · May 6, 2021, 7:16am

I tried replacing the contents of this file with the one you linked to as the new one, but the differences are too big (some includes not found and other errors)

supleed2 · May 22, 2021, 5:24pm

If you’re still having issues with this I think I found the relevant changes, I think the line numbers changed since more changes were added to the file. You want these changes: Currently found here

uint8_t * last_out8 = (uint8_t *)&result[c_longs-1];
uint8_t * last_data8 = (uint8_t *)&last_data;