Segmentation fault on Serial.begin()

[UsoHolger]

I am using Arch Linux and everything seemed to work fine. However: When I try to use serial communication I get
lto1: internal compiler error: Segmentation fault
as soon as Serial.begin(9600); is uncommented. The same code works fine when compiling with the Arduino IDE.

The makefile:

ARDUINO_DIR = /usr/share/arduino
MONITOR_PORT = /dev/ttyACM0
BOARD_TAG = uno
ARDUINO_LIBS = SoftwareSerial
include	/usr/share/arduino/Arduino.mk

Arduino.mk Configuration:

- [AUTODETECTED]       CURRENT_OS = LINUX 
- [USER]               ARDUINO_DIR = /usr/share/arduino 
- [COMPUTED]           ARDMK_DIR = /usr/share/arduino (relative to Common.mk)
- [AUTODETECTED]       ARDUINO_VERSION = 180 
- [DEFAULT]            ARCHITECTURE = avr 
- [DEFAULT]            ARDMK_VENDOR = arduino 
- [AUTODETECTED]       ARDUINO_PREFERENCES_PATH = /home/uso/.arduino15/preferences.txt 
- [AUTODETECTED]       ARDUINO_SKETCHBOOK = /home/uso/Arduino (from arduino preferences file)
- [AUTODETECTED]       AVR_TOOLS_DIR = /usr (found in $PATH)
- [COMPUTED]           ARDUINO_LIB_PATH = /usr/share/arduino/libraries (from ARDUINO_DIR)
- [COMPUTED]           ARDUINO_PLATFORM_LIB_PATH = /usr/share/arduino/hardware/arduino/avr/libraries (from ARDUINO_DIR)
- [COMPUTED]           ARDUINO_VAR_PATH = /usr/share/arduino/hardware/arduino/avr/variants (from ARDUINO_DIR)
- [COMPUTED]           BOARDS_TXT = /usr/share/arduino/hardware/arduino/avr/boards.txt (from ARDUINO_DIR)
- [DEFAULT]            USER_LIB_PATH = /home/uso/Arduino/libraries (in user sketchbook)
- [DEFAULT]            PRE_BUILD_HOOK = pre-build-hook.sh 
- [USER]               BOARD_TAG = uno 
- [COMPUTED]           CORE = arduino (from build.core)
- [COMPUTED]           VARIANT = standard (from build.variant)
- [COMPUTED]           OBJDIR = build-uno (from BOARD_TAG)
- [COMPUTED]           ARDUINO_CORE_PATH = /usr/share/arduino/hardware/arduino/avr/cores/arduino (from ARDUINO_DIR, BOARD_TAG and boards.txt)
- [DETECTED]           MONITOR_BAUDRATE = 9600  (in sketch)
- [DEFAULT]            OPTIMIZATION_LEVEL = s 
- [DEFAULT]            MCU_FLAG_NAME = mmcu 
- [DEFAULT]            CFLAGS_STD = -std=gnu11 -flto -fno-fat-lto-objects 
- [DEFAULT]            CXXFLAGS_STD = -std=gnu++11 -fno-threadsafe-statics -flto 
- [COMPUTED]           DEVICE_PATH = /dev/ttyACM0 (from MONITOR_PORT)
- [DEFAULT]            FORCE_MONITOR_PORT =  
- [AUTODETECTED]       Size utility: AVR-aware for enhanced output
-
-                      ARDUINO_LIBS =
- [PLATFORM]             SoftwareSerial
- [COMPUTED]           BOOTLOADER_PARENT = /usr/share/arduino/hardware/arduino/avr/bootloaders (from ARDUINO_DIR)
- [COMPUTED]           ARDMK_VERSION = 1.5 
- [COMPUTED]           CC_VERSION = 6.3.0 (avr-gcc)

Part of the code that leads to the error:

void setup()
{
    // Init serial data transmission
    Serial.begin(9600);  // If this line is not in here everything works perfectly

    for ( int i = 0; i < NUM_LEDS ; i++ ) // Init the LEDs
        pinMode(LED[i], OUTPUT);

    // Init the buttons
    pinMode(LBUTTON, INPUT);
    pinMode(RBUTTON, INPUT);
    //Serial.print("Initialized");
}

[sej7278]

the arch package seems seriously broken its been noticed before, use git

[UsoHolger]

Thanks for the reply but that does not resolve the issue. I completely removed the AUR packages and cloned the git repo. The most simplistic case is provided by the "SerialPrint" example in the example folder of the repo. It produces the exact same error while other examples like the "Blink" example compile without any problems:

-------------------------
Arduino.mk Configuration:
- [AUTODETECTED]       CURRENT_OS = LINUX 
- [AUTODETECTED]       ARDUINO_DIR = /usr/share/arduino 
- [COMPUTED]           ARDMK_DIR = /home/uso/arduino/Arduino-Makefile (relative to Common.mk)
- [AUTODETECTED]       ARDUINO_VERSION = 180 
- [DEFAULT]            ARCHITECTURE = avr 
- [DEFAULT]            ARDMK_VENDOR = arduino 
- [AUTODETECTED]       ARDUINO_PREFERENCES_PATH = /home/uso/.arduino15/preferences.txt 
- [AUTODETECTED]       ARDUINO_SKETCHBOOK = /home/uso/Arduino (from arduino preferences file)
- [AUTODETECTED]       AVR_TOOLS_DIR = /usr (found in $PATH)
- [COMPUTED]           ARDUINO_LIB_PATH = /usr/share/arduino/libraries (from ARDUINO_DIR)
- [COMPUTED]           ARDUINO_PLATFORM_LIB_PATH = /usr/share/arduino/hardware/arduino/avr/libraries (from ARDUINO_DIR)
- [COMPUTED]           ARDUINO_VAR_PATH = /usr/share/arduino/hardware/arduino/avr/variants (from ARDUINO_DIR)
- [COMPUTED]           BOARDS_TXT = /usr/share/arduino/hardware/arduino/avr/boards.txt (from ARDUINO_DIR)
- [DEFAULT]            USER_LIB_PATH = /home/alex/Arduino/libraries (in user sketchbook)
- [DEFAULT]            PRE_BUILD_HOOK = pre-build-hook.sh 
- [USER]               BOARD_TAG = uno 
- [COMPUTED]           CORE = arduino (from build.core)
- [COMPUTED]           VARIANT = standard (from build.variant)
- [COMPUTED]           OBJDIR = build-uno (from BOARD_TAG)
- [COMPUTED]           ARDUINO_CORE_PATH = /usr/share/arduino/hardware/arduino/avr/cores/arduino (from ARDUINO_DIR, BOARD_TAG and boards.txt)
- [DETECTED]           MONITOR_BAUDRATE = 9600  (in sketch)
- [DEFAULT]            OPTIMIZATION_LEVEL = s 
- [DEFAULT]            MCU_FLAG_NAME = mmcu 
- [DEFAULT]            CFLAGS_STD = -std=gnu11 -flto -fno-fat-lto-objects 
- [DEFAULT]            CXXFLAGS_STD = -std=gnu++11 -fno-threadsafe-statics -flto 
- [AUTODETECTED]       DEVICE_PATH = /dev/ttyACM0 
- [DEFAULT]            FORCE_MONITOR_PORT =  
- [AUTODETECTED]       Size utility: AVR-aware for enhanced output
- [COMPUTED]           BOOTLOADER_PARENT = /usr/share/arduino/hardware/arduino/avr/bootloaders (from ARDUINO_DIR)
- [COMPUTED]           ARDMK_VERSION = 1.5 
- [COMPUTED]           CC_VERSION = 6.3.0 (avr-gcc)
-------------------------
mkdir -p build-uno
/usr/bin/avr-gcc -mmcu=atmega328p -Wl,--gc-sections -Os -flto -fuse-linker-plugin -o build-uno/SerialPrint.elf build-uno/SerialPrint.ino.o build-uno/libcore.a   -lc -lm 
lto1: 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: fatal error: /usr/bin/avr-gcc returned 1 exit status
compilation terminated.
/usr/bin/avr-ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [../../Arduino.mk:1442: build-uno/SerialPrint.elf] Error 1

(That is of course the output of a second make without all the successfull preceeding steps)

Edit:
I could resolve the issue by using the Linux makefile from Bare-Arduino-Project, which sets a lot more settings locally. I do not know which one exactly resovled the issue and sadly do not have the time to investigate this further right now.

[sej7278]

probably as you're using avr-gcc 6.3 instead of 4.9, seems like something to do with LTO support (which BAP doesn't have).

[ladislas]

@UsoHolger how did you install your version of avr-gcc?

[UsoHolger]

I am using the avr-gcc package from the official Arch software repository installed via Pacman.

[ladislas]

well I guess the best way would be to comment the different variables used in bare arduino project and let us know what causes the bug.

[UsoHolger]

I tested using the simplistic SerialPrint example. What does the trick is setting the 2011 standard flag. So this makefile

BOARD_TAG    	  = uno

include ../../Arduino.mk

fails with the segmentation fault error while adding the line CXXFLAGS_STD = -std=gnu++11 leads to successful compilation.

[ladislas]

can i see your code?

[UsoHolger]

I used the SerialPrint example. So the code is:

void setup() {
	Serial.begin(9600);
	Serial.print("Press any key: ");
}

void loop() {
	if (Serial.available()) {
		Serial.println(Serial.read());
	}
}

with the makefile

# Arduino Make file. Refer to https://github.com/sudar/Arduino-Makefile

BOARD_TAG    	  = uno
CXXFLAGS_STD      = -std=gnu++11 # if this is missing compilation fails because of the segmentation fault error

include ../../Arduino.mk

[sej7278]

its the LTO parts of CXXFLAGS_STD/CFLAGS_STD, changing them from -std=gnu11 -flto -fno-fat-lto-objects to anything else e.g. -std=gnu11 removes the LTO flags

https://github.com/sudar/Arduino-Makefile/blob/master/arduino-mk-vars.md#cflags_std

i assume your avr-gcc hasn't been built with LTO support

[ladislas]

Yes, that's an issue with AVR. We are currently investigating the homebrew formula. I'll keep you posted.

[NVieville]

Hello,

Just hitting this issue too, and google led me here. As suggested in osx-cross/homebrew-avr#46 (linked above), I can confirm adding:

CFLAGS_STD = -std=gnu11 -flto -fno-fat-lto-objects
CXXFLAGS_STD = -std=gnu++11 -fno-threadsafe-statics -flto -fno-devirtualize

to Makefile

just make arduino-mk (freshly checked-out from github) compiling without segfault on Fedora 26 x86_64 with:

• /usr/bin/avr-gcc --version
  avr-gcc (Fedora 6.3.0-1.fc26) 6.3.0
• /usr/bin/avr-gcc-ar --version
  GNU ar (GNU Binutils) 2.27

Hope this will be helpful.

Cordially,

--
NVieville

[sej7278]

@NVieville i'm a bit confused as these are set by default now in Arduino.mk

grep gnu.*11 Arduino.mk 
        CFLAGS_STD      = -std=gnu11 -flto -fno-fat-lto-objects
        CXXFLAGS_STD      = -std=gnu++11 -fno-threadsafe-statics -flto

Removing LTO flags fixes things for > 4.9.0 compilers that don't have LTO support, but i'd have thought the f26 compilers do (otherwise report it as a bug as they also package IDE 1.6 which kind of requires it, although f26 is on 1.6.6 not 1.6.10 where LTO was added), what's the problem you're having?

what does -fno-devirtualize do? looks like its a bad thing to set (hacky workaround for a gcc 4.9 bug).