Undefined Symbol ___gxx_personality_v0 on link
C++CGccG++C++ Problem Overview
I've been getting this undefined symbol building with this command line:
$ gcc test.cpp
Undefined symbols:
"___gxx_personality_v0", referenced from:
etc...
test.cpp is simple and should build fine. What is the deal?
C++ Solutions
Solution 1 - C++
Use
g++ test.cpp
instead, since this is c++ code.
Or, if you really want to use gcc, add -lstdc++ to the command line, like so:
gcc test.cpp -lstdc++
Running md5 against the a.out produced under each scenario shows that it's the same output.
But, yeah, g++ probably makes your world a simpler place.
Solution 2 - C++
The .cpp extension causes gcc to compile your file as a C++ file. (See the GCC docs.)
Try compiling the same file, but rename it to have a .c extension:
mv test.cpp
gcc test.c
Alternatively, you can explicitly specify the language by passing -x c to the compiler:
gcc -x c -c test.cpp -o test.o
If you run nm test.o on these C-language versions, you'll notice that ___gxx_personality_v0 is not listed as a symbol.
(And if you run the same command on an object file generated with gcc -c test.cpp -o test.o, the ___gxx_personality_v0 symbol is present.)
Solution 3 - C++
Just in case anyone has the same problem as me: The file extension should be a .c not a .C (gcc is case-sensitive).
Solution 4 - C++
Had the same problem, but a different solution:
C++ code in static library getting linked, and being referenced by a .m file. Renaming the .m file to .mm fixed the issue.