Yesterday I removed all .arduinoIDE-unsaved* from c:\users\sterretje\appdata\local\temp; see [rc9.2]Temporary directories. For no reason, I rebooted my (Win10) PC after that.
This morning I copied a sketch from Keypad (4 toggle switches) + WS2812 (RGB) + Sound Seor - #6 by dunk1 and compiled. First mistake was that there was no board selected (my bad, not a problem); after fixing that by selecting Uno and compiling again, I got the below error message. Note that there is no actual error in the output.
Using board 'uno' from platform in folder: C:\Users\sterretje\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4
Using core 'arduino' from platform in folder: C:\Users\sterretje\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.4
Detecting libraries used...
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "C:\\Users\\sterretje\\AppData\\Local\\Temp\\arduino-sketch-1ECF83C2896EED3C002E5E9FE32474CE\\sketch\\sketch_aug17a.ino.cpp" -o nul
Alternatives for FastLED.h: [FastLED@3.1.6]
ResolveLibrary(FastLED.h)
-> candidates: [FastLED@3.1.6]
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "C:\\Users\\sterretje\\AppData\\Local\\Temp\\arduino-sketch-1ECF83C2896EED3C002E5E9FE32474CE\\sketch\\sketch_aug17a.ino.cpp" -o nul
Alternatives for Keypad.h: [Keypad@3.1.1]
ResolveLibrary(Keypad.h)
-> candidates: [Keypad@3.1.1]
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\AppData\\Local\\Temp\\arduino-sketch-1ECF83C2896EED3C002E5E9FE32474CE\\sketch\\sketch_aug17a.ino.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\FastLED.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\bitswap.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\colorpalettes.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\colorutils.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\hsv2rgb.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\lib8tion.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\noise.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\power_mgt.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED\\wiring.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src\\Key.cpp" -o nul
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src\\Keypad.cpp" -o nul
Generating function prototypes...
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\cores\\arduino" "-IC:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.4\\variants\\standard" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\FastLED" "-IC:\\Users\\sterretje\\Documents\\Arduino\\libraries\\Keypad\\src" "C:\\Users\\sterretje\\AppData\\Local\\Temp\\arduino-sketch-1ECF83C2896EED3C002E5E9FE32474CE\\sketch\\sketch_aug17a.ino.cpp" -o "C:\\Users\\sterretje\\AppData\\Local\\Temp\\arduino-sketch-1ECF83C2896EED3C002E5E9FE32474CE\\preproc\\ctags_target_for_gcc_minus_e.cpp"
"C:\\Users\\sterretje\\AppData\\Local\\Arduino15\\packages\\builtin\\tools\\ctags\\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\\Users\\sterretje\\AppData\\Local\\Temp\\arduino-sketch-1ECF83C2896EED3C002E5E9FE32474CE\\preproc\\ctags_target_for_gcc_minus_e.cpp"
Using library FastLED at version 3.1.6 in folder: C:\Users\sterretje\Documents\Arduino\libraries\FastLED
Using library Keypad at version 3.1.1 in folder: C:\Users\sterretje\Documents\Arduino\libraries\Keypad
exit status 1
Compilation error: exit status 1
Compiled again without changes and it was successful.
I've tried to reproduce it by
- closing the IDE
- removing everything that I think was Arduino related from the temp directory
- starting the IDE
- copied the same sketch
- compiled without board selected and it failed as epected
- fixed the board and it compiled without problem
For now, this is a once-off.