Link error "undefined reference to `__gxx_personality_v0'" and g++

Question

Possible Duplicate:
Undefined Symbol ___gxx_personality_v0 on link

I have a problem with the following program.

// fkt.cpp

#include "fkt.h"

int add2(int a, int b)
{
    return a+b;
}

And the header:

// fkt.h

int add2(int a, int b);

Now I compile this with:

g++ -c fkt.cpp

Now I run nm and get:

00000000 T _Z6add2ii
         U __gxx_personality_v0

When I want to use the function anywhere I get:

(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'

How can I solve this problem? (I'm using Ubuntu Linux.)

Can we see the command line you're using to link with? (You should be using `g++` to do the linking too if you're not already.) — Rup, May 18 '11 at 13:52
I had this error when I forgot to change the `gcc` to `g++` in the Makefile....LOL ;) — enthusiasticgeek, Mar 15 '13 at 18:12
what do you mean by "use this function" are you switching to gcc in that case? — rogerdpack, Sep 26 '18 at 23:20

score 138 · Accepted Answer · edited May 23 '17 at 12:25

138

If g++ still gives error Try using:

g++ file.c -lstdc++

Look at this post: What is __gxx_personality_v0 for?

Make sure -lstdc++ is at the end of the command. If you place it at the beginning (i.e. before file.c), you still can get this same error.

edited May 23 '17 at 12:25

Community

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answered May 18 '11 at 14:00

phoxis

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I have no idea what that -lstdc++ is but it helped me to compile .so library for my jni project. Thanks – Andrzej Rehmann Feb 14 '14 at 09:40
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It links the cpp standard library. – phoxis Feb 14 '14 at 09:42
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Was he sure he was calling g++ and not gcc? -- he shouldnt have to add -lstdc++ manually. – Rich Henry Jun 23 '16 at 18:19

score 74 · Answer 2 · edited Jun 26 '16 at 10:48

74

It sounds like you're trying to link with your resulting object file with gcc instead of g++:

Note that programs using C++ object files must always be linked with g++, in order to supply the appropriate C++ libraries. Attempting to link a C++ object file with the C compiler gcc will cause "undefined reference" errors for C++ standard library functions:

$ g++ -Wall -c hello.cc
$ gcc hello.o       (should use g++)
hello.o: In function `main':
hello.o(.text+0x1b): undefined reference to `std::cout'
.....
hello.o(.eh_frame+0x11):
  undefined reference to `__gxx_personality_v0'

Source: An Introduction to GCC - for the GNU compilers gcc and g++

edited Jun 26 '16 at 10:48

Peter Mortensen

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answered May 18 '11 at 13:52

onteria_

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Happened to me when using [distcc](https://github.com/distcc/distcc/blob/master/README.md), because it defaults to using gcc, not g++. Solution is to specify the compiler `distcc g++ [...]` – jotrocken Oct 02 '15 at 13:55
adding -fno-threadsafe-statics solved the problem for me, when using a Arduino Sketch. – Soundararajan Dec 19 '15 at 08:34

Link error "undefined reference to `__gxx_personality_v0'" and g++

2 Answers2

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