不能 link ipopt 库（MacOS Mojave 上的 C++）
Can't link ipopt library (C++ on MacOS Mojave)
我想在 MacOS Mojave 上的 C++ 软件中使用 ipopt 和 cppad。
编译停止如下图。
为什么编译成功了，链接器还是失败。
Can somebody help?
我在 Xcode 和 CLion 上试过这个。两个 IDE 都给我同样的错误。我也经常使用 brew 重新安装 cppad 和 ipconfig。
include_paths 似乎有效。我可以包括 headers 如下：
#include <cppad/cppad.hpp>
#include <cppad/ipopt/solve.hpp>
Undefined symbols for architecture x86_64:
"Ipopt::IpoptApplication::IpoptApplication(bool, bool)", referenced from:
void CppAD::ipopt::solve<CppAD::vector<double>, FG_eval>(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, FG_eval&, CppAD::ipopt::solve_result<CppAD::vector<double> >&) in MPC.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)
更新：这里是CMakeOutput.log改成-v选项后的前半部分内容：
The system is: Darwin - 18.6.0 - x86_64
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Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
Build flags:
Id flags:
The output was:
0
Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"
The C compiler identification is AppleClang, found in "/Users/peter/CLionProjects/PilotSwoppz/cmake-build-debug/CMakeFiles/3.14.3/CompilerIdC/a.out"
Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
Build flags:
Id flags:
The output was:
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Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"
The CXX compiler identification is AppleClang, found in "/Users/peter/CLionProjects/PilotSwoppz/cmake-build-debug/CMakeFiles/3.14.3/CompilerIdCXX/a.out"
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Parsed C implicit include dir info from above output: rv=done
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我让它按如下方式工作：
问题出现了，因为我没有在CMakeLists.txt中正确包含ipopt库。我通过以下 Make 配置解决了这个问题：
cmake_minimum_required(VERSION 3.14)
project(ProjectName)
set(CMAKE_CXX_STANDARD 17)
include_directories(/usr/local/include)
link_directories(/usr/local/lib)
set(SOURCE_FILES unmanned.cpp mpc.cpp)
add_executable(ProjectName ${SOURCE_FILES})
target_link_libraries(ProjectName ipopt)
我想在 MacOS Mojave 上的 C++ 软件中使用 ipopt 和 cppad。
编译停止如下图。
为什么编译成功了，链接器还是失败。
Can somebody help?
我在 Xcode 和 CLion 上试过这个。两个 IDE 都给我同样的错误。我也经常使用 brew 重新安装 cppad 和 ipconfig。
include_paths 似乎有效。我可以包括 headers 如下：
#include <cppad/cppad.hpp>
#include <cppad/ipopt/solve.hpp>
Undefined symbols for architecture x86_64:
"Ipopt::IpoptApplication::IpoptApplication(bool, bool)", referenced from:
void CppAD::ipopt::solve<CppAD::vector<double>, FG_eval>(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, CppAD::vector<double> const&, FG_eval&, CppAD::ipopt::solve_result<CppAD::vector<double> >&) in MPC.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)
更新：这里是CMakeOutput.log改成-v选项后的前半部分内容：
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Build flags:
Id flags:
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Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
Build flags:
Id flags:
The output was:
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Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"
The CXX compiler identification is AppleClang, found in "/Users/peter/CLionProjects/PilotSwoppz/cmake-build-debug/CMakeFiles/3.14.3/CompilerIdCXX/a.out"
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我让它按如下方式工作：
问题出现了，因为我没有在CMakeLists.txt中正确包含ipopt库。我通过以下 Make 配置解决了这个问题：
cmake_minimum_required(VERSION 3.14)
project(ProjectName)
set(CMAKE_CXX_STANDARD 17)
include_directories(/usr/local/include)
link_directories(/usr/local/lib)
set(SOURCE_FILES unmanned.cpp mpc.cpp)
add_executable(ProjectName ${SOURCE_FILES})
target_link_libraries(ProjectName ipopt)