Verification Failure

[LongChap]

Sketch verification fails after a sketch save. Just editing the sketch and then undoing the edit, ie (reverting back to the original sketch file, the sketch verification succeeds. Success verification messages say using previously compiled (cached?) code in temp location.
Particularly a problem for Nano.
Using IDE 1.8.9 on Windows 10 Pro, ver1903.

[per1234]

When you encounter an error you'll see a button on the right side of the orange bar in the Arduino IDE "Copy error messages". Click that button. Paste the error in a message here using code fencing.

[LongChap]

Hi Here is a copy of the Verification Error messages Arduino: 1.8.9 (Windows 10), Board: "Arduino Nano, ATmega328P (Old Bootloader)" C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Gerry Phillips\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Gerry Phillips\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries F:\Users\Gerry Phillips\Documents\Arduino\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -ide-version=10809 -build-path R:\Users\Gerry Phillips\Temp\arduino_build_652860 -warnings=none -build-cache R:\Users\Gerry Phillips\Temp\arduino_cache_940752 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.2.1.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino14.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-5.4.0-atmel3.6.1-arduino2.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose F:\Users\Gerry Phillips\Documents\Arduino\GPS Clock\GPS_Template_09_TEST_PLL\GPS_Template_09_TEST_PLL.ino C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Gerry Phillips\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Gerry Phillips\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries F:\Users\Gerry Phillips\Documents\Arduino\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -ide-version=10809 -build-path R:\Users\Gerry Phillips\Temp\arduino_build_652860 -warnings=none -build-cache R:\Users\Gerry Phillips\Temp\arduino_cache_940752 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.2.1.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avrdude-6.3.0-arduino14.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc-5.4.0-atmel3.6.1-arduino2.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose F:\Users\Gerry Phillips\Documents\Arduino\GPS Clock\GPS_Template_09_TEST_PLL\GPS_Template_09_TEST_PLL.ino Using board 'nano' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr Using core 'arduino' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr Detecting libraries used... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o nul "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o nul "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\LiquidCrystal" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o nul "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\LiquidCrystal" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\TimerOne-v9" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o nul "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\LiquidCrystal" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\TimerOne-v9" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\EEPROM\\src" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o nul "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\LiquidCrystal" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\TimerOne-v9" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\EEPROM\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\RCSwitch" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o nul Using cached library dependencies for file: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\Wire\src\Wire.cpp Using cached library dependencies for file: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\Wire\src\utility\twi.c Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\FastIO.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\I2CIO.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\LCD.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\LiquidCrystal.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\LiquidCrystal_I2C.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\LiquidCrystal_SR.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\LiquidCrystal_SR2W.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal\LiquidCrystal_SR3W.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\TimerOne-v9\TimerOne.cpp Using cached library dependencies for file: F:\Users\Gerry Phillips\Documents\Arduino\libraries\RCSwitch\RCSwitch.cpp Generating function prototypes... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/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=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\LiquidCrystal" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\TimerOne-v9" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\EEPROM\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\RCSwitch" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\preproc\\ctags_target_for_gcc_minus_e.cpp" "C:\\Program Files (x86)\\Arduino\\tools-builder\\ctags\\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\preproc\\ctags_target_for_gcc_minus_e.cpp" Compiling sketch... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10809 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\variants\\eightanaloginputs" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\Wire\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\LiquidCrystal" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\TimerOne-v9" "-IC:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\libraries\\EEPROM\\src" "-IF:\\Users\\Gerry Phillips\\Documents\\Arduino\\libraries\\RCSwitch" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp" -o "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp.o" Compiling libraries... Compiling library "Wire" Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\Wire\Wire.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\Wire\utility\twi.c.o Compiling library "LiquidCrystal" Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\FastIO.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\LiquidCrystal_I2C.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\I2CIO.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\LCD.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\LiquidCrystal_SR.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\LiquidCrystal.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\LiquidCrystal_SR2W.cpp.o Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\LiquidCrystal\LiquidCrystal_SR3W.cpp.o Compiling library "TimerOne-v9" Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\TimerOne-v9\TimerOne.cpp.o Compiling library "EEPROM" Compiling library "RCSwitch" Using previously compiled file: R:\Users\Gerry Phillips\Temp\arduino_build_652860\libraries\RCSwitch\RCSwitch.cpp.o Compiling core... Using precompiled core: R:\Users\Gerry Phillips\Temp\arduino_cache_940752\core\core_arduino_avr_nano_cpu_atmega328old_0c812875ac70eb4a9b385d8fb077f54c.a Linking everything together... "C:\\Program Files (x86)\\Arduino\\hardware\\tools\\avr/bin/avr-gcc" -w -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p -o "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860/GPS_Template_09_TEST_PLL.ino.elf" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\sketch\\GPS_Template_09_TEST_PLL.ino.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\Wire\\Wire.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\Wire\\utility\\twi.c.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\FastIO.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\I2CIO.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\LCD.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\LiquidCrystal.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\LiquidCrystal_I2C.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\LiquidCrystal_SR.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\LiquidCrystal_SR2W.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\LiquidCrystal\\LiquidCrystal_SR3W.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\TimerOne-v9\\TimerOne.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860\\libraries\\RCSwitch\\RCSwitch.cpp.o" "R:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860/..\\arduino_cache_940752\\core\\core_arduino_avr_nano_cpu_atmega328old_0c812875ac70eb4a9b385d8fb077f54c.a" "-LR:\\Users\\Gerry Phillips\\Temp\\arduino_build_652860" -lm In function 'global constructors keyed to 65535_0_GPS_Template_09_TEST_PLL.ino.cpp.o': lto1.exe: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. lto-wrapper.exe: fatal error: C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-gcc returned 1 exit status compilation terminated. c:/program files (x86)/arduino/hardware/tools/avr/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/ld.exe: error: lto-wrapper failed collect2.exe: error: ld returned 1 exit status Multiple libraries were found for "Wire.h" Used: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\Wire Not used: F:\Users\Gerry Phillips\Documents\Arduino\libraries\Wire Using library Wire at version 1.0 in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\Wire Using library LiquidCrystal in folder: F:\Users\Gerry Phillips\Documents\Arduino\libraries\LiquidCrystal (legacy) Using library TimerOne-v9 in folder: F:\Users\Gerry Phillips\Documents\Arduino\libraries\TimerOne-v9 (legacy) Using library EEPROM at version 2.0 in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\EEPROM Using library RCSwitch in folder: F:\Users\Gerry Phillips\Documents\Arduino\libraries\RCSwitch (legacy) exit status 1 Error compiling for board Arduino Nano. From: per1234 <notifications@github.com> Sent: 15 August 2019 08:59 To: arduino/Arduino <Arduino@noreply.github.com> Cc: LongChap <jgp3shot@virginmedia.com>; Author <author@noreply.github.com> Subject: Re: [arduino/Arduino] Verification Failure (#9144) When you encounter an error you'll see a button on the right side of the orange bar in the Arduino IDE "Copy error messages". Click that button. Paste <https://lifehacker.com/how-to-copy-cut-and-paste-for-beginners-5801525> the error in a message here using code fencing <https://guides.github.com/features/mastering-markdown/> . — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#9144?email_source=notifications&email_token=AM5AP7LEFJOUNYUAGSCMYIDQEUEFBA5CNFSM4IL35X2KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4LED4Q#issuecomment-521552370> , or mute the thread <https://github.com/notifications/unsubscribe-auth/AM5AP7OMBLKEMHRJTPGTM6TQEUEFBANCNFSM4IL35X2A> . <https://github.com/notifications/beacon/AM5AP7J77J7WAP4HRTUQ5QDQEUEFBA5CNFSM4IL35X2KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4LED4Q.gif>

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[per1234]

Closing as duplicate of #7949

This bug is specific to the 5.4.0-atmel3.6.1-arduino2 version of avr-gcc used by Arduino AVR Boards 1.6.22 and newer.

Here's the workaround:

1. Tools > Board > Boards Manager
2. Wait for downloads to finish.
3. When you move the mouse pointer over "Arduino AVR Boards", you will see a "Select version" dropdown menu appear. Select "1.6.21".
4. Click "Install".
5. Wait for installation to finish.
6. Click "Close".

If you have File > Preferences > Check for updates on startup checked, the Arduino IDE may occasionally notify you that a new version of Arduino AVR Boards is available, you'll need to refrain from updating back to the new Arduino AVR Boards version, otherwise you'll be back to seeing the segmentation fault error again.