cmake项目生成错误，共享库与另一个依赖

Question

I'm building a project that uses cmake.

The project uses three shared libraries .so files.

In the CMakeLists.txt file I've added the these lines which link the shared libraries to the executable.

project (lwm2mclient)

LINK_DIRECTORIES(/home/mraa-master-built/build/src)
LINK_DIRECTORIES(/home/libi2capi)
LINK_DIRECTORIES(/home/libtca6424a)
target_link_libraries (lwm2mclient libmraa.so m libi2capi.so libtca6424a.so) 

However, one of the shared libraries libtca6424a.so depends on libi2capi.so ie it uses methods that are defined in it.

So when I'm building the cmake project I get an error like this saying that the .so file cannot find the method which is defined in the other .so file libtca6424a.so .

Could somebody suggest a solution?

/../../lib/libtca6424a.so: undefined reference to `i2c_write_byte_data' 

Answer 1

Please try

target_link_libraries (-Wl,--start-group lwm2mclient libmraa.so m libi2capi.so libtca6424a.so -Wl,--end-group)

or change the order of the libraries