我正在使用MacBook Pro,运行MacOS 10.13.1;使用以下命令通过自制软件安装boost:
brew install boost --build-from-source
我的代码如下:
#include <iostream>
#include <boost/filesystem.hpp>
namespace boostfs = boost::filesystem;
int main(int argc, char* argv[])
{
if (argc <= 1)
{
std::cerr << "Usage: " << argv[0] << " <filename>" << std::endl;
return 1;
}
boostfs::path p(argv[1]);
if (boostfs::exists(p))
{
std::cout << "File " << p << " exists." << std::endl;
}
else
{
std::cout << "File " << p << " does not exist." << std::endl;
}
return 0;
}
我收到的错误如下:
Undefined symbols for architecture x86_64:
"boost::filesystem::detail::status(boost::filesystem::path const&, boost::system::error_code*)", referenced from:
boost::filesystem::exists(boost::filesystem::path const&) in chkfile-c30777.o
"boost::system::system_category()", referenced from:
___cxx_global_var_init.2 in chkfile-c30777.o
"boost::system::generic_category()", referenced from:
___cxx_global_var_init in chkfile-c30777.o
___cxx_global_var_init.1 in chkfile-c30777.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [chkfile] Error 1
我使用make
和gcc 7.2.0
在终端中运行了代码。
我尝试了以下内容:
g++ -std=c++17 -I /usr/local/include/ chkfile.cpp -o chkfile
并收到一个新错误:
Undefined symbols for architecture x86_64:
"boost::filesystem::detail::status(boost::filesystem::path const&, boost::system::error_code*)", referenced from:
boost::filesystem::exists(boost::filesystem::path const&) in cce7HDO8.o
"boost::system::system_category()", referenced from:
__static_initialization_and_destruction_0(int, int) in cce7HDO8.o
"boost::system::generic_category()", referenced from:
boost::system::error_category::std_category::equivalent(int, std::error_condition const&) const in cce7HDO8.o
boost::system::error_category::std_category::equivalent(std::error_code const&, int) const in cce7HDO8.o
__static_initialization_and_destruction_0(int, int) in cce7HDO8.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
我做错了什么?
答案 0 :(得分:0)
以这种方式包含文件系统
#define BOOST_NO_CXX11_SCOPED_ENUMS
#include <boost/filesystem.hpp>
#undef BOOST_NO_CXX11_SCOPED_ENUMS
确保链接正确的库
-lboost_system -lboost_filesystem