Can't link ipopt library (C++ on MacOS Mojave)

Question

I would like to use ipopt and cppad in my C++ software on MacOS Mojave.

Compilation stops as shown below.

Why does it compile and the linker still fails.

Can somebody help?

I tried this on Xcode and CLion . Both IDEs give me the same error. I also frequently reinstalled cppad and ipconfig using brew.

include_paths seem to work. I am able to include headers as follows:

#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)

Update: here the first half of content of CMakeOutput.log after changing to -v option:

The system is: Darwin - 18.6.0 - x86_64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
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:
0


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"

Determining if the C compiler works passed with the following output:
Change Dir: /Users/peter/CLionProjects/PilotSwoppz/cmake-build-debug/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_9bbd5/fast 
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/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc   -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk   -o CMakeFiles/cmTC_9bbd5.dir/testCCompiler.c.o   -c /Users/peter/CLionProjects/PilotSwoppz/cmake-build-debug/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTC_9bbd5
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Detecting C compiler ABI info compiled with the following output:
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Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
clang: warning: -Wl,-v: 'linker' input unused [-Wunused-command-line-argument]
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Apple LLVM version 10.0.1 (clang-1001.0.46.4)
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Thread model: posix
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@(#)PROGRAM:ld  PROJECT:ld64-450.3
BUILD 18:45:16 Apr  4 2019
configured to support archs: armv6 armv7 armv7s arm64 arm64e arm64_32 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em
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Framework search paths:
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Parsed C implicit include dir info from above output: rv=done
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Answer 1

I got it to work as follows:

The problem occured, because I didn't properly include the ipopt library in CMakeLists.txt. I resolved the problem with the following Make configuration:

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)