Undefined Symbol ___gxx_personality_v0 on link
Use
g++ test.cppinstead, 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.
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.cppgcc test.cAlternatively, you can explicitly specify the language by passing -x c to the compiler:
gcc -x c -c test.cpp -o test.oIf 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.)