Arduinojson: Undefined reference to __cxa_guard_acquire and __cxa_guard_release

[jonblack]

When I compile the JsonParserExample I get the following error:

build-mega-atmega2560/example.ino.o: In function `ArduinoJson::JsonArray::invalid()':
example.ino:(.text._ZN11ArduinoJson9JsonArray7invalidEv[ArduinoJson::JsonArray::invalid()]+0xc): undefined reference to `__cxa_guard_acquire'
example.ino:(.text._ZN11ArduinoJson9JsonArray7invalidEv[ArduinoJson::JsonArray::invalid()]+0x28): undefined reference to `__cxa_guard_release'
build-mega-atmega2560/example.ino.o: In function `ArduinoJson::JsonObject::invalid()':
example.ino:(.text._ZN11ArduinoJson10JsonObject7invalidEv[ArduinoJson::JsonObject::invalid()]+0xc): undefined reference to `__cxa_guard_acquire'
example.ino:(.text._ZN11ArduinoJson10JsonObject7invalidEv[ArduinoJson::JsonObject::invalid()]+0x28): undefined reference to `__cxa_guard_release'
collect2: error: ld returned 1 exit status
/home/jon/.arduino_mk/Arduino.mk:1416: recipe for target 'build-mega-atmega2560/arduino-example.elf' failed
make: *** [build-mega-atmega2560/arduino-example.elf] Error 1

I remember a similar problem with the Ethernet library a while back and found the issue for it (https://github.com/esp8266/Arduino/issues/574). Perhaps that can help.

[jonblack]

It turns out this happens because I'm using https://github.com/sudar/Arduino-Makefile to compile the project. When I use the IDE, it works fine.

[bblanchon]

I would be very interested to know if you find a proper workaround so that I could add it to Compatibility Issues.
It's probably a flag missing in the invocation of the linker.

[jonblack]

I figured out the problem. I had the following in my Makefile:

CXXFLAGS_STD += -std=gnu++11

Removing this fixed the problem.

[bblanchon]

I don't like this because it mean you won't be able to use C++11 features in your code.

Can you try to add this flag instead:

-fno-threadsafe-statics
Do not emit the extra code to use the routines specified in the C++ ABI for thread-safe initialization of local statics. You can use this option to reduce code size slightly in code that doesn't need to be thread-safe.

[jonblack]

Apparently Arduino defaults to c++14 and I was appending gnuc++11, so it got totally messed up. Should be fine without it.

[satishIoT]

CXXFLAGS_STD += -std=gnu++11 ; Could you pl give steps where precisely this correction to be made. Im finding very hard to make out.

[bblanchon]

Hello Satish,

If you use the Arduino IDE, you need to edit the platform.txt of the board you're using:

• The file is located at %LOCALAPPDATA%\Arduino15\packages\<brand>\hardware\<board>\<version>\platform.txt
• The line to change is compiler.cpp.flags

I edited the FAQ, so that it'll be easier to find.

Please confirm this solves your problem.

Regards,
Benoit

[satishIoT]

Thanks Benoit , for the speedy reply. Will try out and get back to you at
once.

regards

satish

On Mon, Mar 13, 2017 at 2:52 PM, Benoît Blanchon [e-mail]
wrote:

Hello Satish,

If you use the Arduino IDE, you need to edit the platform.txt of the
board you're using:

• The file is located at %LOCALAPPDATA%\Arduino15\
  packages\\hardware\\platform.txt
• The line to change is compiler.cpp.flags

I edited the FAQ
https://arduinojson.org/faq/compilation-fails-device-crashes-nothing-on-serial-console/#error-undefined-reference-to-cxaguardacquire-and-cxaguardrelease,
so that it'll be easier to find.

Please confirm this solves your problem.

Regards,
Benoit

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[satishIoT]

Hi Benoit

Located the path for platform.txt for esp8266 module found the following
lines .
compiler.cpp.flags=-c -Os -g -mlongcalls -mtext-section-literals
-fno-exceptions -fno-rtti -falign-functions=4 -std=c++11 -MMD
-ffunction-sections -fdata-sections

Found the line as
compiler.cpp.flags=-c -Os -g -mlongcalls -mtext-section-literals
-fno-exceptions -fno-rtti -falign-functions=4 -std=c++11 -MMD
-ffunction-sections -fdata-sections

Removed the line: -std=c++11
compiler.cpp.flags=-c -Os -g -mlongcalls -mtext-section-literals
-fno-exceptions -fno-rtti -falign-functions=4 -MMD -ffunction-sections
-fdata-sections

Saved the file and opend Arduino 1.6.4 version IDE

From examples ArduinoJson took the file JsonParserExample.ino file and
recompiled ... This gave me the following error

Arduino: 1.6.4 (Windows 8.1), Board: "Generic ESP8266 Module, Serial, 80
MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS), ck"

In file included from
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/Arduino.h:247:0,
from JsonParserExample.ino:10:
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/HardwareSerial.h:85:27:
warning: override controls (override/final) only available with -std=c++11
or -std=gnu++11 [enabled by default]
int available(void) override;
^
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/HardwareSerial.h:86:22:
warning: override controls (override/final) only available with -std=c++11
or -std=gnu++11 [enabled by default]
int peek(void) override;
^
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/HardwareSerial.h:87:22:
warning: override controls (override/final) only available with -std=c++11
or -std=gnu++11 [enabled by default]
int read(void) override;
^
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/HardwareSerial.h:89:24:
warning: override controls (override/final) only available with -std=c++11
or -std=gnu++11 [enabled by default]
void flush(void) override;
^
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/HardwareSerial.h:90:29:
warning: override controls (override/final) only available with -std=c++11
or -std=gnu++11 [enabled by default]
size_t write(uint8_t) override;
^
In file included from JsonParserExample.ino:10:0:
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/Arduino.h:275:48:
error: 'nullptr' was not declared in this scope
const char* server1, const char* server2 = nullptr, const char*
server3 = nullptr);
^
C:\Users\Satish\AppData\Roaming\Arduino15\packages\esp8266\hardware\esp8266\2.0.0cores\esp8266/Arduino.h:275:79:
error: 'nullptr' was not declared in this scope
const char* server1, const char* server2 = nullptr, const char*
server3 = nullptr);

^
Error compiling.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

Have spent more then a day to sort the problum still getting same error .
Appreciate your help to solve the issue.

regards

satish

On Mon, Mar 13, 2017 at 3:10 PM, satish kumar [e-mail]
wrote:

Thanks Benoit , for the speedy reply. Will try out and get back to you at
once.

regards

satish

On Mon, Mar 13, 2017 at 2:52 PM, Benoît Blanchon <[email protected]

wrote:

Hello Satish,

If you use the Arduino IDE, you need to edit the platform.txt of the
board you're using:

• The file is located at %LOCALAPPDATA%\Arduino15\packa
  ges\\hardware\\platform.txt
• The line to change is compiler.cpp.flags

I edited the FAQ
https://arduinojson.org/faq/compilation-fails-device-crashes-nothing-on-serial-console/#error-undefined-reference-to-cxaguardacquire-and-cxaguardrelease,
so that it'll be easier to find.

Please confirm this solves your problem.

Regards,
Benoit

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[bblanchon]

Satish, you should add -fno-threadsafe-statics and keep -std=c++11.

Explanation:

1. -std=c++11 enables support for the new language features introduced in the C++11 standard, like nullptr
2. -fno-threadsafe-statics disables the mutex around initialization of local static variables, which is useless when you program is single threaded.

[satishIoT]

Aaha finally done compiling :) . Thank you very much had understood totally
wrong .

On Mon, Mar 13, 2017 at 4:18 PM, Benoît Blanchon [e-mail]
wrote:

Satish, you should add -fno-threadsafe-statics and keep -std=c++11.

Explanation:

1. -std=c++11 enables support for the new language features introduced
   in the C++11 standard, like nullptr
2. -fno-threadsafe-statics disables the mutex around initialization of
   local static variables, which is useless when you program is single
   threaded.

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[jonblack]

Just to clarify the cause (for me). I was appending -std=gnu++11 to CXXFLAGS_STD. Because it defaults to -std=gnu++14, I had two standards defined which of course isn't gonna work.