我从cmake 3.6升级到任何最新版本(3.12.0-rc2),现在我的一个程序无法编译。
奇怪的是,错误消息显示了标准库中未定义的符号。下面是错误消息:
Undefined symbols for architecture x86_64:
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(char const*)", referenced from:
GetName() in ncc.cpp.o
Expression() in ncc.cpp.o
Term() in ncc.cpp.o
GetNum() in ncc.cpp.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string()", referenced from:
GetName() in ncc.cpp.o
GetNum() in ncc.cpp.o
"std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::operator+=(char)", referenced from:
GetName() in ncc.cpp.o
GetNum() in ncc.cpp.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[2]: *** [ncc] Error 1
make[1]: *** [CMakeFiles/ncc.dir/all] Error 2
make: *** [all] Error 2
我该怎么解决?是否需要链接到标准库的其他版本?如果是的话,我怎么告诉我?
这是我的cmakelists.txt文件:
cmake_minimum_required(VERSION 3.0)
project(ncc)
add_definitions(-std=c++14)
add_subdirectory(${CMAKE_SOURCE_DIR}/src/)
add_executable(ncc ${CompSource})
add_executable(ncc-opt ${OptSource})
add_executable(nci ${IntSource})
我试过了
add_definitions
线和没有它,这似乎没有什么区别。
这是运行
make VERBOSE=1
以下内容:
Scanning dependencies of target ncc
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/ncc.dir/build.make CMakeFiles/ncc.dir/build
[ 83%] Building CXX object CMakeFiles/ncc.dir/src/ncc.cpp.o
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -std=c++14 -o CMakeFiles/ncc.dir/src/ncc.cpp.o -c /Users/nepps/Dropbox/Projects/ncc/src/ncc.cpp
[100%] Linking CXX executable ncc
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/ncc.dir/link.txt --verbose=1
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/ncc.dir/src/ncc.cpp.o -o ncc
Undefined symbols for architecture x86_64:
(same errors as above)
如果您需要更多信息,请随时发表评论。我在用MacBook Pro运行MacOS 10.13.3。
