Include shared library into Linux application using CMake – GCC linker errors - linux

Question

I have no trouble building my application under Visual Studio's environment, but due to lack of experience, I am having trouble under Linux/GCC. Although GCC compiles my app successfully, but it reports linker errors.
The first thing I did was to build a shared library using CMakeLists.txt. The file has no ‘make install’ so I manually copied the shared library file to a global location as follows:
sudo cp libibpp.a /usr/local/lib/
Since applications built with the IBPP library require you to include a single header file, I copied it to a global location:
sudo cp ibpp.h /usr/local/include/
So far, so good but when I run CMake for my application, I am getting linker errors such as:
undefined reference to ‘isc_create_database’
I am successfully using many ‘shared libraries’ in my application (such as Boost Regex/Filesystem/Chrono/DateTime/Thread). The only ‘static library’ that I am using is IBPP (libibpp.a).
I suspect that I am missing something in my application’s CMakeListst.txt:
cmake_minimum_required(VERSION 3.10.2)
project(myapp)
file(GLOB src "*.h" "*.cpp")
add_executable(myapp ${src})
target_link_libraries(myapp ibpp icuuc icudata boost_regex boost_system boost_filesystem
boost_chrono boost_date_time boost_thread pthread)
add_definitions(-DIBPP_LINUX)
Can someone provide me with some hints as to why I get linker errors related to IBPP?
UPDATED:
User n.m. asked me to build using the VERBOSE option, so here is the output:
/usr/bin/cmake -E cmake_link_script CMakeFiles/myapp.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/myapp.dir/appServer.cpp.o CMakeFiles/myapp.dir/app_env.cpp.o CMakeFiles/myapp.dir/app_setting.cpp.o CMakeFiles/myapp.dir/authenticationServer.cpp.o CMakeFiles/myapp.dir/bustacheTestStencil.cpp.o CMakeFiles/myapp.dir/commonKeys.cpp.o CMakeFiles/myapp.dir/dataFetcher.cpp.o CMakeFiles/myapp.dir/fighterKeys.cpp.o CMakeFiles/myapp.dir/fighterProfileJsonGenerator.cpp.o CMakeFiles/myapp.dir/fighterProfileMarkupGenerator.cpp.o CMakeFiles/myapp.dir/fighterStorage.cpp.o CMakeFiles/myapp.dir/forwardProxyServer.cpp.o CMakeFiles/myapp.dir/headerProcessor.cpp.o CMakeFiles/myapp.dir/homepageStencil.cpp.o CMakeFiles/myapp.dir/httpUtils.cpp.o CMakeFiles/myapp.dir/locale.cpp.o CMakeFiles/myapp.dir/main.cpp.o CMakeFiles/myapp.dir/markupServer.cpp.o CMakeFiles/myapp.dir/myTools.cpp.o CMakeFiles/myapp.dir/stdafx.cpp.o CMakeFiles/myapp.dir/unicodeFunctions.cpp.o CMakeFiles/myapp.dir/utils.cpp.o -o myapp -libpp -licutu -licutest -licuio -licui18n -licuuc -licudata -lboost_regex -lboost_system -lboost_filesystem -lboost_chrono -lboost_date_time -lbustache -lboost_thread -lpthread
//usr/local/lib/libibpp.a(_ibpp.cpp.o): In function `ibpp_internals::GDS::Call()':
_ibpp.cpp:(.text+0x2c): undefined reference to `isc_create_database'
_ibpp.cpp:(.text+0x3b): undefined reference to `isc_attach_database'
....
_ibpp.cpp:(.text+0x2bd): undefined reference to `isc_service_start'
_ibpp.cpp:(.text+0x2cf): undefined reference to `isc_service_query'
collect2: error: ld returned 1 exit status
CMakeFiles/myapp.dir/build.make:640: recipe for target 'myapp' failed
make[2]: *** [myapp] Error 1
make[2]: Leaving directory '/home/carol/Documents/vm_shared/AppServer/build'
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/myapp.dir/all' failed
make[1]: *** [CMakeFiles/myapp.dir/all] Error 2
make[1]: Leaving directory '/home/carol/Documents/vm_shared/AppServer/build'
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Answer 1

Problem solved thanks to comment by n.m. above. Since I was not including libfbclient, I was getting the "undefined references to 'isc_create_database', and other 'isc_...' messages.
Using the settings below, I am now able to use my precompiled/built IBPP library instead of having to include the source code into my application!
Here is a simplified, very barebones CMakeLists.txt that demonstrates what is required to get your IBPP.a implemented into your app without having to include the IBPP source into your app:
file(GLOB src "*.cpp")
add_executable(myapp ${src})
target_link_libraries(myapp ibpp fbclient)
Make note of the order, libibpp must be before libfbclient.