clang - 无法使用 clang 将 libFuzzer.a 与 libc++ 链接

Question

我正在尝试链接在一起:

• libFuzzer.a，使用 clang++-5.0 和 -std=c++11 编译
• 我的模糊驱动程序，使用 clang++-5.0 和 -std=c++11 -stdlib=libc++ 编译
• libcurl，用clang-5.0编译

具体来说，正在执行此链接器命令:

/bin/bash ../../libtool --silent --tag=CXX --mode=link clang++-5.0 -I../../include -I../../lib -I../../lib -I../../tests/fuzz -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc-guard,trace-cmp -std=c++11 -stdlib=libc++ -o curl_fuzzer curl_fuzzer-curl_fuzzer.o ../../lib/libcurl.la /root/checkouts/Fuzzer/libFuzzer.a -lssh2 -lssl -lcrypto -lssl -lcrypto -lz -lpthread -lm

执行此命令输出以下内容:

/bin/bash ../../libtool --silent --tag=CXX   --mode=link clang++-5.0 -I../../include -I../../lib -I../../lib -I../../tests/fuzz -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc-guard,trace-cmp -std=c++11 -stdlib=libc++   -o curl_fuzzer curl_fuzzer-curl_fuzzer.o ../../lib/libcurl.la /root/checkouts/Fuzzer/libFuzzer.a  -lssh2 -lssl -lcrypto -lssl -lcrypto -lz -lpthread -lm > /tmp/cat.txt 2>&1; head -20 /tmp/cat.txt
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `fuzzer::FileToVector(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long, bool)':
/root/checkouts/Fuzzer/./FuzzerIO.cpp:34: undefined reference to `std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::_Ios_Openmode)'
/root/checkouts/Fuzzer/./FuzzerIO.cpp:40: undefined reference to `std::istream::seekg(long, std::_Ios_Seekdir)'
/root/checkouts/Fuzzer/./FuzzerIO.cpp:41: undefined reference to `std::istream::tellg()'
/root/checkouts/Fuzzer/./FuzzerIO.cpp:47: undefined reference to `std::istream::seekg(long, std::_Ios_Seekdir)'
/root/checkouts/Fuzzer/./FuzzerIO.cpp:49: undefined reference to `std::istream::read(char*, long)'
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `~basic_ifstream':
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/fstream:534: undefined reference to `VTT for std::basic_ifstream<char, std::char_traits<char> >'
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/fstream:534: undefined reference to `std::basic_ifstream<char, std::char_traits<char> >::~basic_ifstream()'
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `~basic_ios':
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/bits/basic_ios.h:282: undefined reference to `std::ios_base::~ios_base()'
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `~basic_ifstream':
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/fstream:534: undefined reference to `VTT for std::basic_ifstream<char, std::char_traits<char> >'
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/fstream:534: undefined reference to `std::basic_ifstream<char, std::char_traits<char> >::~basic_ifstream()'
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `~basic_ios':
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/bits/basic_ios.h:282: undefined reference to `std::ios_base::~ios_base()'
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `fuzzer::FileToString(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
/root/checkouts/Fuzzer/./FuzzerIO.cpp:54: undefined reference to `std::basic_ifstream<char, std::char_traits<char> >::basic_ifstream(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::_Ios_Openmode)'
/root/checkouts/Fuzzer/libFuzzer.a(FuzzerIO.o): In function `~basic_ifstream':
/usr/bin/../lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/fstream:534: undefined reference to `VTT for std::basic_ifstream<char, std::char_traits<char> >'
<snip>

我已尝试执行以下操作来解决此问题:

• 添加 -lc++ - 什么都不做
• 添加 -lc++abi - 不执行任何操作

感觉好像我遗漏了一些明显的东西，但我不确定是什么......

我的 clang-5.0 安装来自 clang-5.0/kali-rolling。

Answer 1

您已经使用 libstdc++ 编译了部分代码，使用 libc++ 编译了部分代码。当您将它们链接在一起(使用 libc++)时，引用 libstdc++ 的部分不会得到解析。

例如，std::__cxx11::basic_string 绝对是一个 libstdc++ 符号。