Problem compiling BerkeleyDB C++ Example

Question

Hi,
I'm an Ubuntu user and i'm trying to compile the MyDb.cpp file in the directory /examples_cxx/getting_started.
During the installation phase i've used the rigth procedure using the --enable-cxx prefix for the configure
after when i try to compile the example using:
claus@Nemesis:~/Desktop/Project_uni/Tecnologies/Berkeley_db-4.6.21/examples_cxx/getting_started$ g++ -o MyDb MyDb.cpp -I/usr/local/BerkeleyDB.4.6/include/ -L/usr/local/BerkeleyDB.4.6/lib/
I've this result:
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/tmp/ccd3kQ2S.o: In function `MyDb::close()':
MyDb.cpp:(.text+0x88): undefined reference to `Db::close(unsigned int)'
/tmp/ccd3kQ2S.o: In function `MyDb::MyDb(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool)':
MyDb.cpp:(.text+0x264): undefined reference to `Db::Db(DbEnv*, unsigned int)'
MyDb.cpp:(.text+0x2a0): undefined reference to `Db::set_error_stream(std::basic_ostream<char, std::char_traits<char> >*)'
MyDb.cpp:(.text+0x2b9): undefined reference to `Db::set_flags(unsigned int)'
MyDb.cpp:(.text+0x306): undefined reference to `Db::open(DbTxn*, char const*, char const*, DBTYPE, unsigned int, int)'
MyDb.cpp:(.text+0x477): undefined reference to `Db::~Db()'
/tmp/ccd3kQ2S.o: In function `MyDb::MyDb(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool)':
MyDb.cpp:(.text+0x4b2): undefined reference to `Db::Db(DbEnv*, unsigned int)'
MyDb.cpp:(.text+0x4ee): undefined reference to `Db::set_error_stream(std::basic_ostream<char, std::char_traits<char> >*)'
MyDb.cpp:(.text+0x507): undefined reference to `Db::set_flags(unsigned int)'
MyDb.cpp:(.text+0x554): undefined reference to `Db::open(DbTxn*, char const*, char const*, DBTYPE, unsigned int, int)'
MyDb.cpp:(.text+0x6c5): undefined reference to `Db::~Db()'
/tmp/ccd3kQ2S.o:(.gcc_except_table+0x28): undefined reference to `typeinfo for DbException'
/tmp/ccd3kQ2S.o:(.gcc_except_table+0x6c): undefined reference to `typeinfo for DbException'
/tmp/ccd3kQ2S.o:(.gcc_except_table+0xa0): undefined reference to `typeinfo for DbException'
collect2: ld returned 1 exit status
Can you help me,please?
Thanks a lot

Answer 1

Hello,
On my Linux box I would compile the example by doing the following:
1. cd build_unix
2. make excxx_example_database_load
If you look at the Makefile you will see that the excxx_example_database_load
target builds MyDb.
Also I assume that your PATH and whatever is the equivalent of
LD_LIBRARY_PATH is set correctly.
If this does not help, let me know.
Thanks,
Sandra