Upgrading CERES v1.14.0 to v2.0.0 - Error when linking CERES v2.0.0 in a C++ project

**Development description:**

OS: Ubuntu `18.04`

Main project dependencies: OpenMVG `v1.2` and CERES `v2.0.0`

CMake version: `3.10.2`



Hi folks!



I'm trying to upgrade the version of CERES Solver in my project from `v1.14.0` to `v2.0.0` but I'm getting some errors during the compilation. With v1.14.0 it is compiling and working correctly but when I try to compile with v2.0.0 I got the next error:



```

Scanning dependencies of target test_transforms

[ 78%] Building CXX object tests/CMakeFiles/test_transforms.dir/test_transforms.cpp.o

[ 79%] Linking CXX executable test_transforms

../myproject/transforms/libmyproject_transforms.so: undefined reference to `ceres::Problem::AddResidualBlock(ceres::CostFunction*, ceres::LossFunction*, double* const*, int)'

collect2: error: ld returned 1 exit status

tests/CMakeFiles/test_transforms.dir/build.make:173: recipe for target 'tests/test_transforms' failed

make[2]: *** [tests/test_transforms] Error 1

CMakeFiles/Makefile2:2832: recipe for target 'tests/CMakeFiles/test_transforms.dir/all' failed

make[1]: *** [tests/CMakeFiles/test_transforms.dir/all] Error 2

Makefile:140: recipe for target 'all' failed

make: *** [all] Error 2

```



It seems that it is a linking issue:

```

../libmyproject/transforms/libmyproject_transforms.so: undefined reference to `ceres::Problem::AddResidualBlock(ceres::CostFunction*, ceres::LossFunction*, double* const*, int)'

```

This is the way I'm defining the CMakeLists.txt for the module where I use CERES solver



```

cmake_minimum_required(VERSION 3.5)

project(myproject_transforms)

add_definitions(-std=c++14)



# Eigen used for SVD and others

find_package(Eigen REQUIRED)

include_directories(${EIGEN_INCLUDE_DIRS})



# OpenMVG for RANSAC related

add_definitions(${OPENMVG_DEFINITIONS})



# Ceres for bundle adjustment

find_package(Ceres REQUIRED)

target_link_libraries(${PROJECT_NAME} ceres)

include_directories(${CERES_INCLUDE_DIRS})



# Myproject common definitions and libraries

target_link_libraries(${PROJECT_NAME} ${MYPROJECT_THIRD_PARTY_LIBS})

add_definitions(${MYPROJECT_DEFINITIONS})



install(TARGETS ${PROJECT_NAME} DESTINATION lib EXPORT MYPROJECT_EXPORTS)

```



Can you give a hint about how to solve it?



Btw, I'm not sure if it is related but I disabled the `miniglog` included into OpenMVG repo because I was getting some issues during the compilation of my project. Instead I installed glog and gflags before compiling OpenMVG and CERES solver. One more note, the order I'm following for the compilation is: 

1. gflags

2. glog

3. OpenMVG 1.2

4. CERES Solver 2.0.0

5. Myproject

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