c++ - 如何在我的项目中链接 re2 库，就像使用 cmake 的静态库一样

Question

我的问题:此刻我正在动态链接 libre2，但我想静态地进行链接。我在我的电脑上安装了这个库(sudo apt-get install libre2-dev)，得到了“二进制文件”并在我的可执行文件中链接了这个二进制文件“libre2.so”。但我想 git 克隆存储库或通过 git 子模块执行此操作，然后构建此存储库并将其静态链接到我的项目中。

我是新来的，很抱歉我的英语不好

1) 我的项目结构

- bin
- build
- external
    - re2
- main.cpp
- CMakeLists.txt
- README.md  

2) CMakeLists.txt

cmake_minimum_required( VERSION 2.6 )

project( simmc-agent )

# version number  
set ( VERSION_MAJOR 0 )  
set ( VERSION_MINOR 0 )  

# cpr requires c++11  
set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11" )  

# src : main   
file ( GLOB SOURCES *.cpp )  

# linking res library dinamically  
set(RE2_LIBRARIES -L${RE2_LIBRARY_DIR} -l libre2.so)  

# src : collect functions - depend on OS  
if ( WIN32 )  
    file ( GLOB SOURCES ${SOURCES} src/windows/*.cpp )  
else ()     # if( UNIX )  
    file ( GLOB SOURCES ${SOURCES} src/linux/*.cpp )  
endif ()  

# headers  
include_directories ( "include" )  

# test   
option( PRINT_JSON "Set to ON to print json objects before sending" OFF )  
message(STATUS "${PRINT_JSON}: ${${PRINT_JSON}}")  
if ( PRINT_JSON )  
    add_definitions ( -DPRINT_JSON )  
endif ()  

# compile
set ( CMAKE_RUNTIME_OUTPUT_DIRECTORY "../bin" )
add_executable ( agent-v${VERSION_MAJOR}.${VERSION_MINOR} ${SOURCES} )  
target_link_libraries ( agent-v${VERSION_MAJOR}.${VERSION_MINOR} ${RE2_LIBRARY} )

3) main.cpp

#include <iostream>     
#include <re2/re2.h>

using namespace std;  
using namespace re2;

int main (int argc, char **argv) {  
    cout << "hello world" << endl;

 int matchResult;

 matchResult = RE2::FullMatch("hello", "h.*o"); 
 cout << "matchResult = " << matchResult << endl;  

   return 0;  

}

Answer 1

编辑 - (26.01.17):大家好。我在这里谈谈我如何解决它。 按照此处提供的一些提示，我创建了一个名为 re2.cmake 的文件:

cmake_minimum_required ( VERSION 2.8.7 )

if (NOT RE2_NAME)

include (ExternalProject)

SET (RE2_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/re2/src/re2/)
SET (RE2_EXTRA_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/re2/src/re2/)
SET (RE2_URL https://github.com/google/re2.git)
SET (RE2_BUILD ${CMAKE_BINARY_DIR}/re2/src/re2)  
SET (RE2_LIBRARIES ${RE2_BUILD}/obj/so/libre2.so)
get_filename_component(RE2_STATIC_LIBRARIES ${RE2_BUILD}/libre2.a ABSOLUTE)  
SET (RE2_INCLUDES ${RE2_BUILD})

if ( WIN32 )   
  SET (RE2_STATIC_LIBRARIES ${RE2_BUILD}/${CMAKE_BUILD_TYPE}/re2.lib) 
else ()   
  SET (RE2_STATIC_LIBRARIES ${RE2_BUILD}/libre2.a) 
endif ()

ExternalProject_Add(RE2      
  PREFIX RE2      
  GIT_REPOSITORY ${RE2_URL}      
  # GIT_TAG ${RE2_TAG}      
  DOWNLOAD_DIR "${DOWNLOAD_LOCATION}"      
  BUILD_IN_SOURCE 1      
  INSTALL_COMMAND sudo make install     
   CMAKE_CACHE_ARGS         
    -DCMAKE_BUILD_TYPE:STRING=Release          -DCMAKE_VERBOSE_MAKEFILE:BOOL=OFF          -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON  
)

 ## put re2 includes in the directory where they are expected  
 add_custom_target(re2_create_destination_dir COMMAND ${CMAKE_COMMAND} -E make_directory ${RE2_INCLUDE_DIR}/re2 DEPENDS re2)   

 add_custom_target(re2_copy_headers_to_destination DEPENDS re2_create_destination_dir)   

 foreach(header_file ${RE2_HEADERS})      
    add_custom_command(TARGET re2_copy_headers_to_destination PRE_BUILD COMMAND ${CMAKE_COMMAND} -E copy ${header_file} ${RE2_INCLUDE_DIR}/re2)  
  endforeach ()   

  ADD_LIBRARY(RE2_LIB STATIC IMPORTED DEPENDS RE2)  
  SET_TARGET_PROPERTIES(RE2_LIB PROPERTIES IMPORTED_LOCATION ${RE2_STATIC_LIBRARIES})

endif (NOT RE2_NAME)

此文件下载存储库，在我的计算机中构建和安装库 libre2。这个库依赖于线程库*(我认为所有的 linux 操作系统都带有这个库)。

但是，有一个问题:如果我是 root 用户，我只会这样做。因为该库使用了“make install”命令并要执行此操作，所以您需要成为 root 用户。

我的项目结构:

- bin
- build
- src
- include
- modules
    - re2.cmake
- CMakeLists.txt

在我的 CMakeLists.txt 之后:

cmake_minimum_required ( VERSION 2.8.7 )

project ( project C CXX)

# version number
SET ( VERSION_MAJOR 0 )
SET ( VERSION_MINOR 0 )

SET ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11" )

# src : main
file ( GLOB SOURCES src/main.cpp )

# headers
include_directories ( "include" )

# src : libre2 - Download, build and install the library

find_package (Threads)

include ( "modules/re2.cmake" )
set(RE2_STATIC_LIBRARIES -L${RE2_LIBRARY_DIR} -l libre2.a )

# compile 
set ( CMAKE_RUNTIME_OUTPUT_DIRECTORY "../bin" )
add_executable ( project-v${VERSION_MAJOR}.${VERSION_MINOR} ${SOURCES})
target_link_libraries ( project-v${VERSION_MAJOR}.${VERSION_MINOR} ${RE2_STATIC_LIBRARIES})

add_dependencies(project-v${VERSION_MAJOR}.${VERSION_MINOR} RE2)

target_link_libraries (project-v${VERSION_MAJOR}.${VERSION_MINOR} ${CMAKE_THREAD_LIBS_INIT})