linker error: undefined reference to `OPENSSL_init_ssl'

[GSuggitt]

I am building in a Debian docker container.

I build with:

RUN apt-get -y install zlib1g-dev g++ cmake doxygen graphviz libboost-all-dev libssl-dev

WORKDIR /source
RUN git clone https://github.com/jgaa/restc-cpp.git

WORKDIR /source/restc-cpp/dbuild
RUN cmake ..
RUN make

which leaves the includes under /source/restc-cpp/include.

My source file is:

#include <restc-cpp/restc-cpp.h>
int main(int argc, char *argv[]) 
{
    auto rest_client = restc_cpp::RestClient::Create();
}

I set my include search path in my CMakelist.txt file with:
include_directories(MyProject PRIVATE /source/restc-cpp/include)

But when I compile, I get the error: cannot find "rest-cpp/config.h" needed by <restc-cpp/restc-cpp.h>

Well I found it in restc-cpp/dbuild/generated-include/restc-cpp/config.h

So I copied it (and export.h) into /source/restc-cpp/include/restc-cpp/

And now it compiles but I get a link error: undefined reference to `OPENSSL_init_ssl'

My CMakelist.txt file is:

cmake_minimum_required(VERSION 2.8)

project(MyProject)

set(SOURCES 
    ${CMAKE_CURRENT_SOURCE_DIR}/test/test_rest.cpp
)

add_executable(MyProject ${SOURCES} )

set_target_properties(MyProject PROPERTIES
                        OUTPUT_NAME testrest
                      )

include_directories(MyProject PRIVATE /source/restc-cpp/include)

set(CMAKE_BUILD_TYPE Release)
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

ADD_DEFINITIONS(-DBOOST_LOG_DYN_LINK)
ADD_DEFINITIONS(-DBOOST_COROUTINE_NO_DEPRECATION_WARNING)

target_link_libraries(MyProject /source/restc-cpp/lib/librestc-cpp.a)

#the following are required for restc-cpp
#----------------------------------------
target_link_libraries(MyProject z)
target_link_libraries(MyProject crypto)
target_link_libraries(MyProject ssl)
target_link_libraries(MyProject boost_system )
target_link_libraries(MyProject boost_program_options )
target_link_libraries(MyProject boost_filesystem )
target_link_libraries(MyProject boost_date_time )
target_link_libraries(MyProject boost_context )
target_link_libraries(MyProject boost_coroutine ) 
target_link_libraries(MyProject boost_chrono )
target_link_libraries(MyProject boost_log )
target_link_libraries(MyProject boost_thread)
target_link_libraries(MyProject boost_log_setup )
target_link_libraries(MyProject boost_regex )
target_link_libraries(MyProject boost_atomic )
target_link_libraries(MyProject pthread)

I believe the crypto library should supply this reference, so I don't see what I am doing wrong

[jgaa]

It's simpler probably to just include the project into your own cmake project. You can see how it can be done here:

https://github.com/jgaa/k8deployer/blob/b36a6c4b542275f7c2e499da7304637a927106cb/cmake/external-projects.cmake#L12
https://github.com/jgaa/k8deployer/blob/b36a6c4b542275f7c2e499da7304637a927106cb/CMakeLists.txt#L65

You can also make and make install, to copy the headers and libraries into /usr/local/...

If you want me to take a look at your current problem, can you create a public repository with it>? Than I can take a look and provide a PR if I find a simple solution.