How to link compiled cmph library in my project using CMake - c++

Question

In order to use cmph, a perfect minimal hashing library, in my project organised using CMake, I installed cmph library in a ubuntu machine and tested it using a single c file called main.c.
If I try to compile this file using gcc 5.3.0 using the following command:
gcc main.c
I will get the following output
/tmp/ccSOH5ob.o: In function `main':
testperfect.c:(.text+0x63): undefined reference to `cmph_io_vector_adapter'
testperfect.c:(.text+0x73): undefined reference to `cmph_config_new'
testperfect.c:(.text+0x88): undefined reference to `cmph_config_set_algo'
testperfect.c:(.text+0x9b): undefined reference to `cmph_config_set_mphf_fd'
testperfect.c:(.text+0xa7): undefined reference to `cmph_new'
testperfect.c:(.text+0xb7): undefined reference to `cmph_config_destroy'
testperfect.c:(.text+0xca): undefined reference to `cmph_dump'
testperfect.c:(.text+0xd6): undefined reference to `cmph_destroy'
testperfect.c:(.text+0xe2): undefined reference to `cmph_load'
testperfect.c:(.text+0x118): undefined reference to `cmph_search'
testperfect.c:(.text+0x153): undefined reference to `cmph_destroy'
testperfect.c:(.text+0x15f): undefined reference to `cmph_io_vector_adapter_destroy'
But if I run this command:
gcc main.c $(pkg-config --libs cmph) -o main
It will be compiled and run normally.
Now I need to add a similar piece of code in my project and the CMakeList.txt is written like this:
set(PROJECT_EXECUTABLE ${PROJECT_NAME})
# Compiling flags.
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR
CMAKE_CXX_COMPILER_ID MATCHES "Clang")
set(CMAKE_CXX_FLAGS_RELEASE "-O2")
set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g")
set(CMAKE_CXX_FLAGS_DEBUG "-g")
set(CMAKE_CXX_FLAGS_MINSIZEREL "-Os")
endif()
# Inject project config.
configure_file(
${PROJECT_INCLUDE_DIR}/phsim/config.hpp.in
${PROJECT_INCLUDE_DIR}/phsim/config.hpp
)
include(FindPkgConfig)
find_package(PkgConfig REQUIRED)
pkg_search_module(CMPH REQUIRED cmph)
target_link_libraries(Phsim ${CMPH_LIBRARIES})
target_include_directories(Phsim PUBLIC ${CMPH_INCLUDE_DIRS})
target_compile_options(Phsim PUBLIC ${CMPH_CFLAGS_OTHER})
# Compile executable.
file(GLOB SOURCES ${PROJECT_SRC_DIR}/*.cpp)
add_executable(${PROJECT_EXECUTABLE} ${SOURCES})
set_target_properties(${PROJECT_EXECUTABLE} PROPERTIES
VERSION ${PHSIM_VERSION_LITER}
)
And then I try to run cmake . and make, but only get the error message:
CMake Error at src/CMakeLists.txt:20 (target_link_libraries):
Cannot specify link libraries for target "Phsim" which is not built by this
project.
But I won't get target executable file unless I compile the project. If I try to compile my project without those commands related to library linking, the compiler will give similar link errors provided in the beginning of my question.
I have checked the following questions:
Undefined reference to cmph functions even after installing cpmh library
And I tried instructions provided by these sites:
https://cmake.org/Wiki/CMake:How_To_Find_Libraries
https://cmake.org/cmake/help/v3.6/module/FindPkgConfig.html
Many thanks in advance.

Answer 1

Finally Solved.
cmake_minimum_required(VERSION 3.0.2)
project(TestGamma)
set(GAMMATEST_VERSION_MAJOR 1)
set(GAMMATEST_VERSION_MINOR 0)
set(CMPH_INCLUDE_DIR /usr/local/lib)
include(FindPkgConfig)
configure_file(
"${PROJECT_SOURCE_DIR}/TestGammaConfig.h.in"
"${PROJECT_BINARY_DIR}/TestGammaConfig.h"
)
include_directories(${PROJECT_BINARY_DIR})
set(CMAKE_CXX_FLAGS " ${CMAKE_CXX_FLAGS} -std=c++11")
set(SOURCE_FILES main.cpp)
add_executable(testgamma ${SOURCE_FILES})
pkg_check_modules(CMPH REQUIRED cmph)
include_directories(${CMPH_INDLUDE_DIR})
link_directories(${CMPH_INCLUDE_DIR})
target_link_libraries(testgamma cmph ${CMPH_INCLUDE_DIR})
Make sure to include pkgconfig at first and add link operations after calling "add_executable"
#usr1234567 Thank you for your attention.