C++ GNU Linker Errors

Question

I'm trying to complie my program on Windows via Cygwin with the compilation command:

g++ ping.cpp -I./include -L./lib -lchartdir50

I'm using an API called ChartDirector which draws charts for me. I've never linked libraries this way before (usually I do it through Visual Studio) so i'm a little new to this. I've got a really large list of errors, so I won't list them all, but i'll list one just to clarify the type of linker errors i'm getting:

(.text$_ZN9BaseChartD1Ev[BaseChart::~BaseChart()]+0x4f): undefined reference to '_CBaseChart_destroy'

All of these are undefined reference to 'xxx' errors.

I've got a bunch of header files in ./include and a library called chartdir50.lib in ./lib

Whats wrong with my compilation line?

Answer 1

I am not sure but .lib have been compiled with Visual C++ ?

If yes I don't think it's compatible with GCC, you have to compile the library with GCC/G++ and use that file or to use a compatible binary if you don't have access to the source.

Answer 2

I assuming that lib was created with gcc also.

AFAIK .lib is static library so you don't have to point it with -l compiler switch.

Just use it as another file in command line, like

g++ ping.cpp -I./include -L./lib {path to lib here}/chartdir50.lib

hth.

Answer 3

Hi,

I never use that library before, but when I googled it, I noticed that other people trying like -lchartdir instead of -lchartdir50, so you should give it a try.

Answer 4

Hmm... thats odd. I'm using a 64-bit system, but for some reason I tried it with the 32-bit library and it compiled. Thanks!