getopt_long problem

[jenea]

HI!
I write a little test program.
In witch I use getopt_long function...
I included unstd.h , optget.h , stdio.h and stdlib.h
when i try to link the program with gcc -o result main.o
( within a makefile , i.e I run make)
it says

tmp/ccGfK1gp.o(.eh_frame+0x11): undefined reference to
`__gxx_personality_v0'
collect2: ld returned 1 exit status
make: *** [run] Error 1

As result it doesn't generate binary file
When I remove call of getopt_long functions the problem disapears...
Realy strange!...
Any ideas ?
10x in advance .

 

[Roger Leigh]

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I write a little test program.
In witch I use getopt_long function...
I included unstd.h , optget.h , stdio.h and stdlib.h
when i try to link the program with gcc -o result main.o

tmp/ccGfK1gp.o(.eh_frame+0x11): undefined reference to
`__gxx_personality_v0'
collect2: ld returned 1 exit status
make: *** [run] Error 1

When I remove call of getopt_long functions the problem disapears...

$ nm -D -C /usr/lib/libstdc++.so.6 | grep __gxx_personality_v0
000a0e70 T __gxx_personality_v0

You are writing C++, not C, and so you need to use g++ rather than gcc
to link.

getopt_long is a red herring; you need to check if you are
unintentionally using C++ features in your program. Assuming you are
writing C, since this is a C group, you need to remove the C++
features from your code and then linking should work fine.


Regards,
Roger

- --
Roger Leigh
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[jacob navia]

HI!
I write a little test program.
In witch I use getopt_long function...
I included unstd.h , optget.h , stdio.h and stdlib.h
when i try to link the program with gcc -o result main.o
( within a makefile , i.e I run make)
it says

tmp/ccGfK1gp.o(.eh_frame+0x11): undefined reference to
`__gxx_personality_v0'
collect2: ld returned 1 exit status
make: *** [run] Error 1

As result it doesn't generate binary file
When I remove call of getopt_long functions the problem disapears...
Realy strange!...
Any ideas ?
10x in advance .

The same message appeared in a similar thread just a few
hours ago: (Subject: GCC linker throws weird error message)

>I am compiling with GCC 3.2, and it works well enough. However,
>sometimes when I try to link libraries, the linker throws
>"NOTAD.o(.eh_frame+0x11):NOTAD.C: undefined reference to
>`__gxx_personality_v0'". This never happened until about 3 days ago.

The solution is:

> because your filename is in UPPER CASE gcc is treating it as a C++
> source. rename extension to lower case (.c instead of .C) and it
> should work.

Posted by Rex.

Truly a *clear* error message: