Question

Using: windows xp, g++ 3.4.4 with cygwin and g++ 3.4.5 with mingw.

I’m compiling a simple unit test class with cppunit.

When I link using g++ 3.4.5 I get a lot of linking errors. When I link with g++ 3.4.4 I don’t get any errors and the exe links fine and runs.

I can’t seem to trace down the errors, so any thoughts?

Thanks.

EDIT: linking errors: Unreferenced function errors. Like:

 SimpleTest.cpp:(.text+0x313): undefined reference to `CppUnit::Message::Message(std::string const&, std::string const&)'

EDIT: cmd line:

g++ -I g:\projects\thirdparty\cppunit-1.12.1\include -L g:\projects\thirdparty\cppunit-1.12.1\lib -l cppunitd -o main.exe main.cpp SimpleTest.cpp

Update: Same code in Visual Studio: No error, unit test runs as expected.

Answer 1

Your problem is likely incorrect link line. The order of sources/object files and libraries on the link line matters. Correct link line:

g++ -I g:\projects\thirdparty\cppunit-1.12.1\include \
    -L g:\projects\thirdparty\cppunit-1.12.1\lib \
    -o main.exe main.cpp SimpleTest.cpp -lcppunitd