如何在我的項目中使用CMake鏈接已編譯的cmph庫

Question

爲了使用cmph，一個完美的最小哈希庫，在我使用CMake組織的項目中，我在一臺Ubuntu機器上安裝了cmph庫，並使用一個名爲c的文件main.c中

如果我嘗試用gcc 5.3.0使用下面的命令編譯該文件：

gcc main.c 

我會得到下面的輸出

/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' 

但是，如果我運行此命令：

gcc main.c $(pkg-config --libs cmph) -o main 

它將被編譯並正常運行。

現在我需要添加一個類似的一段代碼在我的項目和CMakeList.txt是這樣寫的：

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} 
) 

然後我嘗試運行cmake的。並只能得到錯誤信息：

CMake Error at src/CMakeLists.txt:20 (target_link_libraries): 
    Cannot specify link libraries for target "Phsim" which is not built by this 
    project. 

但我不會得到目標可執行文件，除非我編譯項目。如果我嘗試編譯我的項目時沒有與庫鏈接相關的命令，編譯器會在我的問題開始時提供類似的鏈接錯誤。提前

https://cmake.org/Wiki/CMake:How_To_Find_Libraries

https://cmake.org/cmake/help/v3.6/module/FindPkgConfig.html

非常感謝：

我已經檢查了以下問題：

Undefined reference to cmph functions even after installing cpmh library

我試圖通過這些網站提供的說明。

Answer 1

終於解決了。

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}) 

確保包括pkgconfig在第一，並呼籲「add_executable」

@ usr1234567感謝您的關注之後添加鏈接操作。