Boost and ssl problems on cpprestsdk build

[Dainerx]

I'm failing to build cpprest on my elementary OS.

g++ -v

gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.11)

dpkg -s libboost-dev | grep 'Version'

Version: 1.58.0.1ubuntu1

dpkg -s cmake | grep 'Version'

Version: 3.5.1-1ubuntu3

openssl version -a

OpenSSL 1.1.1 11 Sep 2018 (Library: OpenSSL 1.1.1b 26 Feb 2019)

When I run ninja I get countless errors on boost ssl and openssl directories. The following in not the entirety of the errors:

[1/159] Building CXX object Release/src/CMakeFiles/cpprest.dir/http/common/http_helpers.cpp.o
FAILED: Release/src/CMakeFiles/cpprest.dir/http/common/http_helpers.cpp.o 
/usr/bin/c++   -DCPPREST_EXCLUDE_BROTLI=1 -DCPPREST_FORCE_HTTP_CLIENT_ASIO -DCPPREST_FORCE_HTTP_LISTENER_ASIO -DCPPREST_NO_SSL_LEAK_SUPPRESS -Dcpprest_EXPORTS -I../Release/include -I../Release/src/pch -std=c++11 -fno-strict-aliasing -g -fPIC   -Werror -pedantic -Wall -Wextra -Wunused-parameter -Wcast-align -Wcast-qual -Wconversion -Wformat=2 -Winit-self -Winvalid-pch -Wmissing-format-attribute -Wmissing-include-dirs -Wpacked -Wredundant-decls -Wunreachable-code -MMD -MT Release/src/CMakeFiles/cpprest.dir/http/common/http_helpers.cpp.o -MF Release/src/CMakeFiles/cpprest.dir/http/common/http_helpers.cpp.o.d -o Release/src/CMakeFiles/cpprest.dir/http/common/http_helpers.cpp.o -c ../Release/src/http/common/http_helpers.cpp
In file included from /usr/include/openssl/bio.h:20:0,
                 from /usr/include/openssl/conf.h:13,
                 from /usr/include/boost/asio/ssl/detail/openssl_types.hpp:19,
                 from /usr/include/boost/asio/ssl/context_base.hpp:19,
                 from /usr/include/boost/asio/ssl/context.hpp:27,
                 from /usr/include/boost/asio/ssl.hpp:19,
                 from ../Release/include/cpprest/http_client.h:68,
                 from ../Release/src/pch/stdafx.h:101,
                 from ../Release/src/http/common/http_helpers.cpp:14:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp: In constructor ‘boost::asio::ssl::detail::openssl_init_base::do_init::do_init()’:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:43:23: error: expected id-expression before ‘(’ token
     mutexes_.resize(::CRYPTO_num_locks());
                       ^
In file included from /usr/include/boost/asio/ssl/detail/openssl_init.hpp:100:0,
                 from /usr/include/boost/asio/ssl/context.hpp:29,
                 from /usr/include/boost/asio/ssl.hpp:19,
                 from ../Release/include/cpprest/http_client.h:68,
                 from ../Release/src/pch/stdafx.h:101,
                 from ../Release/src/http/common/http_helpers.cpp:14:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:46:66: error: expected id-expression before ‘;’ token
     ::CRYPTO_set_locking_callback(&do_init::openssl_locking_func);
                                                                  ^
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:47:56: error: expected id-expression before ‘;’ token
     ::CRYPTO_set_id_callback(&do_init::openssl_id_func);
                                                        ^
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp: In destructor ‘boost::asio::ssl::detail::openssl_init_base::do_init::~do_init()’:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:64:32: error: expected id-expression before ‘;’ token
     ::CRYPTO_set_id_callback(0);
                                ^
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:65:37: error: expected id-expression before ‘;’ token
     ::CRYPTO_set_locking_callback(0);
                                     ^
In file included from /usr/include/openssl/engine.h:25:0,
                 from /usr/include/boost/asio/ssl/detail/openssl_types.hpp:22,
                 from /usr/include/boost/asio/ssl/context_base.hpp:19,
                 from /usr/include/boost/asio/ssl/context.hpp:27,
                 from /usr/include/boost/asio/ssl.hpp:19,
                 from ../Release/include/cpprest/http_client.h:68,
                 from ../Release/src/pch/stdafx.h:101,
                 from ../Release/src/http/common/http_helpers.cpp:14:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:66:7: error: expected id-expression before ‘while’
     ::ERR_free_strings();
       ^
In file included from /usr/include/openssl/x509.h:18:0,
                 from /usr/include/openssl/ssl.h:20,
                 from /usr/include/boost/asio/ssl/detail/openssl_types.hpp:20,
                 from /usr/include/boost/asio/ssl/context_base.hpp:19,
                 from /usr/include/boost/asio/ssl/context.hpp:27,
                 from /usr/include/boost/asio/ssl.hpp:19,
                 from ../Release/include/cpprest/http_client.h:68,
                 from ../Release/src/pch/stdafx.h:101,
                 from ../Release/src/http/common/http_helpers.cpp:14:
/usr/include/boost/asio/ssl/detail/impl/openssl_init.ipp:72:7: error: expected id-expression before ‘while’
     ::EVP_cleanup();
       ^

I guess this is not mainly a cpprestsdk issue but more of boost and ssl. Although I'm wondering, what is exactly causing this and how can I proceed to fix it so I can build cpprest.

[StrikeCPP]

Its happening mostly due to two version of boost being installed on the host. The older one containing the older ssl code and hence generating all these errors.