我正在Mac上用cmake构建我的c程序.编译器给我以下错误:
error: boost/filesystem.hpp: No such file or directory
触发错误的行如下:
#include "boost/filesystem.hpp"
要么
#include <boost/filesystem.hpp>
我使用以上哪项不会改变错误
但是在我的CMakeLists.txt中,我将以下列方式包含boost头:
FIND_PACKAGE(Boost) MESSAGE("Boost information:") MESSAGE(" Boost_INCLUDE_DIRS: ${Boost_INCLUDE_DIRS}") MESSAGE(" Boost_LIBRARIES: ${Boost_LIBRARIES}") MESSAGE(" Boost_LIBRARY_DIRS: ${Boost_LIBRARY_DIRS}") INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS}) LINK_DIRECTORIES(${Boost_LIBRARY_DIRS})
在cmake过程中,Boost包含dirs已填充“/ opt / local / include /”,此文件夹包含一个包含filesystem.hpp的文件夹boost
Boost在生成Makefile时给出以下消息,我只复制boost部分:
-- Boost version: 1.38.0 -- Found the following Boost libraries: Boost information: Boost_INCLUDE_DIRS: /opt/local/include Boost_LIBRARIES: Boost_LIBRARY_DIRS: /opt/local/lib -- Configuring done
当运行make VERBOSE = 1此行包含错误:
cd /Users/janusz/Documents/workspace/ImageMarker/Debug/src && /usr/bin/c++ -O3 -Wall -Wno-deprecated -g -verbose -I/Users/janusz/Documents/workspace/ImageMarker/src/. -o CMakeFiles/ImageMarker.dir/FaceRecognizer.cpp.o -c /Users/janusz/Documents/workspace/ImageMarker/src/FaceRecognizer.cpp /Users/janusz/Documents/workspace/ImageMarker/src/FaceRecognizer.cpp:8:32: error: boost/filesystem.hpp: No such file or directory make[2]: *** [src/CMakeFiles/ImageMarker.dir/FaceRecognizer.cpp.o] Error 1
你明白为什么编译器没有选择/ opt / local / include目录?
如果您需要更多信息,我很乐意提供
解决方法
首先使用
FIND_PACKAGE(Boost required)
而不是
FIND_PACKAGE(Boost)
这样,在开始任何编译之前,如果没有找到它,cmake会给你一个很好的错误消息.如果没有将环境变量BOOST_ROOT设置为/ opt / local(这是安装前缀).
此外,您将不得不链接到文件系统库,所以你想要
FIND_PACKAGE(Boost COMPONENTS filesystem required)
供以后使用
target_link_libraries(mytarget ${Boost_FILESYSTEM_LIBRARY})
输入
cmake --help-module FindBoost
在shell中获取cmake安装中的Boost查找模块的文档.
PS:一个例子
CMakeLists.txt
cmake_minimum_required(VERSION 2.6) project(Foo) find_package(Boost COMPONENTS filesystem required) include_directories(${Boost_INCLUDE_DIRS}) add_executable(foo main.cpp) target_link_libraries(foo ${Boost_FILESYSTEM_LIBRARY} )
main.cpp中
#include <boost/filesystem.hpp> #include <vector> #include <string> #include <cstdio> #include <cstddef> namespace fs = boost::filesystem; using namespace std; int main(int argc,char** argv) { vector<string> args(argv+1,argv+argc); if(args.empty()) { printf("usage: ./foo SOME_PATH\n"); return EXIT_FAILURE; } fs::path path(args.front()); if(fs::exists(path)) printf("%s exists\n",path.string().c_str()); else printf("%s doesn't exist\n",path.string().c_str()); return EXIT_SUCCESS; }