铿锵3.8使文件失败

Question

我挠了3个多小时后，我终于放弃了，并决定要求你们帮忙。

我有几个文件，它会编译成一个可执行文件。

随着-stdlib=libc++ flag，我会得到

/usr/include/c++/v1/string:1938:44: error: 'basic_string<_CharT, _Traits, _Allocator>' is missing exception specification 'noexcept(is_nothrow_copy_constructible<allocator_type>::value)' 
basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a) 
             ^
/usr/include/c++/v1/string:1326:40: note: previous declaration is here 
    _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type& __a) 

我做了一些搜索和其他太问题susggests。更改为-stdlib=libstdc++，我在控制台中获得了大量输出。

/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:382: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:382: undefined reference to `std::allocator<char>::~allocator()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:382: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:382: undefined reference to `std::allocator<char>::~allocator()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:399: undefined reference to `std::allocator<char>::allocator()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:399: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:399: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:399: undefined reference to `std::allocator<char>::~allocator()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:399: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:399: undefined reference to `std::allocator<char>::~allocator()' 
png.o: In function `__cxx_global_var_init': 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/iostream:74: undefined reference to `std::ios_base::Init::Init()' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/iostream:74: undefined reference to `std::ios_base::Init::~Init()' 
png.o: In function `epng_err(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:18: undefined reference to `std::cerr' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:19: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:19: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:19: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)' 
/home/bobby/Documents/freshmen/225/cs225/lab_intro/png.cpp:19: undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))' 
png.o: In function `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1158: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1159: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1159: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::reserve(unsigned long)' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1160: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::append(char const*, unsigned long)' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1161: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::append(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1163: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' 
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.tcc:1163: undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()' 
clang: error: linker command failed with exit code 1 (use -v to see invocation) 

这只是吐露出来的信息的最后部分。

Make文件是在这里

EXENAME = lab_intro 
OBJS = main.o png.o rgbapixel.o 

CXX = clang++ 
CXXFLAGS = -std=c++1y -stdlib=libstdc++ -c -g -O0 -Wall -Wextra -pedantic 
LD = clang++ 
LDFLAGS = -std=c++1y -stdlib=libc++ -lpng -lc++abi -lpthread 

all : $(EXENAME) 

$(EXENAME) : $(OBJS) 
    $(LD) $(OBJS) $(LDFLAGS) -o $(EXENAME) 

main.o : main.cpp png.h rgbapixel.h 
    $(CXX) $(CXXFLAGS) main.cpp 

png.o : png.cpp png.h rgbapixel.h 
    $(CXX) $(CXXFLAGS) png.cpp 

rgbapixel.o : rgbapixel.cpp rgbapixel.h 
    $(CXX) $(CXXFLAGS) rgbapixel.cpp 

clean : 
    -rm -f *.o $(EXENAME) 

操作系统是Ubuntu的16.04LTS，并安装所有必要的依赖（或者我认为我正确安装）。

文件树

lab_intro/ 
    Makefile 
    main.cpp 
    png.cpp 
    png.h 
    rgbapixel.h 
    rgbapixel.cpp 
    sample.png 

Answer 1

您需要添加以下对一个你构建线：

• -L/usr/lib目录-lstdC++

• -L/USR/lib -llibC++