无法在MacOS Mojave上链接C ++ 11的库

Question

I'm having trouble getting boost/openssl to link to my C++ project in CLion. I'm trying to build my program in CLion by clicking build, although I've also been trying to just manually compile with g++ but to no avail. My CMakeLists.txt looks like:

cmake_minimum_required(VERSION 3.12)
project(FinalProject)
set(CMAKE_CXX_STANDARD 11)

# Set OpenSSL dir, this should be default on linux/mac
set(OPENSSL_INCLUDE_DIR, /usr/local/opt/openssl/bin/openssl)

# Get OpenSSL
find_package(openssl REQUIRED)

# Get cppRestSDK
find_package(cpprestsdk REQUIRED)

find_package(boost REQUIRED)



# Compile + Link
add_executable(FinalProject main.cpp)

target_link_libraries(FinalProject cpprestsdk::cpprest)

I've tried changing

target_link_libraries(FinalProject cpprestsdk::cpprest)

to

target_link_libraries(FinalProject boost ssl cpprestsdk::cpprest)

and many other variations to ensure that all the dependencies I'm using get loaded (OpenSSL, cpprestsdk, and Boost) however I can't seem to get any of these to work as I keep getting various errors like:

"library not found for "-lssl", "-lboost", "-lopenssl"

I installed openssl using homebrew but when I run homebrew link openssl I get: "Refusing to link macOS-provided software: openssl" and adding --force gives me the same error message.

I've created symbolic links in the paths mentioned here but to no avail.

Running the CMakeLists.txt with just the target_link_libraries(FinalProject cpprestsdk::cpprest) gives me:

Undefined symbols for architecture x86_64:
  "boost::system::detail::system_category_ncx()", referenced from:
      boost::system::system_category() in main.cpp.o
  "boost::system::detail::generic_category_ncx()", referenced from:
      boost::system::generic_category() in main.cpp.o
ld: symbol(s) not found for architecture x86_64

But I can't figure out why since it seems Boost is loading fine (I get the message "Boost Version 1.68" when I build with target_link_libraries(FinalProject PRIVATE cpprestsdk::cpprest boost) but I also get the error ld: library not found for -lboost ).

In my main.cpp (only file with code) I'm including:

#include <iostream>
#include <string>
#include <cpprest/http_client.h>
#include <cpprest/filestream.h>
#include  "openssl/bio.h"
#include  "openssl/ssl.h"
#include  "openssl/err.h"

Anyone know what I'm missing? I'm guessing it's something simple in my CMakeLists.txt, but not sure. My only OpenSSL version is 1.0.2q and I'm on MacOS Mojave. Running openssl in my terminal does work, so it appears to be in my PATH. Really at a loss here as I'm not sure what's wrong at this point. Any help appreciated!

Answer 1

Specify that you want from boost. Here, you need "system":

find_package(Boost REQUIRED system)

Boost sets up variables to help after:

target_link_libraries(FinalProject ssl cpprestsdk::cpprest ${Boost_SYSTEM_LIBRARY})