这是为什么升压头文件中不包括 [英] Why is this boost header file not included
问题描述
我建立我的C ++程序与Mac上的CMake。编译器给了我以下错误:
I'm building my c++ program with cmake on a Mac. The compiler gives me following Error:
error: boost/filesystem.hpp: No such file or directory
这触发错误的行是:
#include "boost/filesystem.hpp"
或
#include <boost/filesystem.hpp>
这上面我用不改变错误
Which of the above I use doesn't changed the Error
但是,在我的CMakeLists.txt我包括以下列方式升压标头:
But in my CMakeLists.txt I include the boost headers in the following way:
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})
升压include目录充满了/选择/本地/包括/在cmake的过程,并在此文件夹中包含其中包含filesystem.hpp文件夹提振
Boost include dirs is filled with "/opt/local/include/" during the cmake process and this folder contains a folder boost which contains the filesystem.hpp
加速提供了以下信息,同时生成的Makefile,我只复制了部分提振:
Boost gives the following messages while generating the Makefile, I only copied the boost part:
-- 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
在运行使VERBOSE = 1这一行包含错误:
While running make VERBOSE=1 This line contains the error:
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不采摘的/ opt /本地/ include目录?
Do you understand why the compiler isn't picking the /opt/local/include directory?
如果您需要更多的信息,我很高兴向它提供
If you need more information I'm happy to provide it
推荐答案
全部使用首先
FIND_PACKAGE(Boost REQUIRED)
而不是
FIND_PACKAGE(Boost)
这样的CMake会给你一个不错的错误信息,如果任何编译启动之前没有找到它,很长。如果失败设置环境变量BOOST_ROOT到/ opt /本地(即安装preFIX)。
此外,您将在文件系统库进行链接,让您随心所欲
This way cmake will give you a nice error message if it doesn't find it, long before any compilations are started. If it fails set the environment variable BOOST_ROOT to /opt/local (which is the install prefix). Additionally you will have to link in the filesystem library, so you want
FIND_PACKAGE(Boost COMPONENTS filesystem REQUIRED)
以备后用
target_link_libraries(mytarget ${Boost_FILESYSTEM_LIBRARY})
输入
cmake --help-module FindBoost
在shell得到了提振文档找到你的CMake安装模块。
at the shell to get the docs for the Boost find module in your cmake installation.
PS:一个例子
本的CMakeLists.txt
The CMakeLists.txt
cmake_minimum_required(VERSION 2.6)
project(Foo)
find_package(Boost COMPONENTS filesystem REQUIRED)
include_directories(${Boost_INCLUDE_DIRS})
add_executable(foo main.cpp)
target_link_libraries(foo
${Boost_FILESYSTEM_LIBRARY}
)
的main.cpp
main.cpp
#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;
}
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