c++ - 带有示例的休息床静态库

Question

您好，我想将 restbed 编译为带有示例的静态库，但我遇到了链接器错误。

使用:ubuntu 16.04 gcc-5.4

我做了什么:

cd dependency/openssl
./config

*long text*

Configured for linux-x86_64.

*** Because of configuration changes, you MUST do the following before
*** building:

       make depend

所以我确实做了依赖和制作。它使 libcrypto.a 和 libssl.a 所以我觉得这部分没问题？？

下一步

cd build
cmake -DBUILD_TESTS=YES -DBUILD_EXAMPLES=YES -DBUILD_SSL=YES -DBUILD_SHARED=NO -DCMAKE_INSTALL_PREFIX=static ..
   Copyright 2013-2017, Corvusoft Ltd, All Rights Reserved.
-- Found ASIO include at: /home/jova/git/restbed/dependency/asio/asio/include
-- Found Kashmir include at: /home/jova/git/restbed/dependency/kashmir
-- Found OpenSSL library at: /home/jova/git/restbed/dependency/openssl/libssl.a
-- Found OpenSSL include at: /home/jova/git/restbed/dependency/openssl/include
-- Found Crypto library at: /home/jova/git/restbed/dependency/openssl/libcrypto.a
-- Failed to locate PAM, skipping example.
-- Found Syslog include at: /usr/include
-- Found Catch include at: /home/jova/git/restbed/dependency/catch/include
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jova/git/restbed/build-static
jova:~/git/restbed/build-static$ make -j4 install
[  0%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/uri.cpp.o
[  0%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/rule.cpp.o
[  0%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/string.cpp.o
[  1%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/http.cpp.o
[  1%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/request.cpp.o
[  2%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/service.cpp.o
[  2%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/session.cpp.o
[  2%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/resource.cpp.o
[  2%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/response.cpp.o
[  3%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/settings.cpp.o
[  3%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/web_socket.cpp.o
[  3%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/ssl_settings.cpp.o
[  4%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/session_manager.cpp.o
[  4%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/detail/http_impl.cpp.o
[  4%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/web_socket_message.cpp.o
[  5%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/detail/socket_impl.cpp.o
[  5%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/detail/service_impl.cpp.o
[  5%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/detail/session_impl.cpp.o
[  6%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/detail/web_socket_impl.cpp.o
[  6%] Building CXX object CMakeFiles/restbed.dir/source/corvusoft/restbed/detail/web_socket_manager_impl.cpp.o
[  6%] Linking CXX static library librestbed.a
[  6%] Built target restbed
[  6%] Building CXX object example/CMakeFiles/https_client_verify_peer.dir/https_client/source/verify_peer.cpp.o
[  6%] Building CXX object example/CMakeFiles/web_socket.dir/web_socket/source/example.cpp.o
[  7%] Building CXX object example/CMakeFiles/https_service.dir/https_service/source/example.cpp.o
[  7%] Building CXX object example/CMakeFiles/signal_handling.dir/signal_handling/source/example.cpp.o
[  7%] Linking CXX executable example/signal_handling
[  7%] Linking CXX executable example/https_client_verify_peer
[  7%] Linking CXX executable example/https_service
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
dso_dlfcn.c:(.text+0x11): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x24): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x2f): undefined reference to `dlclose'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func':
dso_dlfcn.c:(.text+0x334): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x3db): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var':
dso_dlfcn.c:(.text+0x454): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x4fb): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
dso_dlfcn.c:(.text+0x569): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x5cb): undefined reference to `dlclose'
dso_dlfcn.c:(.text+0x603): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr':
dso_dlfcn.c:(.text+0x69f): undefined reference to `dladdr'
dso_dlfcn.c:(.text+0x709): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_unload':
dso_dlfcn.c:(.text+0x762): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
example/CMakeFiles/signal_handling.dir/build.make:97: recipe for target 'example/example/signal_handling' failed
make[2]: *** [example/example/signal_handling] Error 1
CMakeFiles/Makefile2:297: recipe for target 'example/CMakeFiles/signal_handling.dir/all' failed
make[1]: *** [example/CMakeFiles/signal_handling.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
dso_dlfcn.c:(.text+0x11): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x24): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x2f): undefined reference to `dlclose'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func':
dso_dlfcn.c:(.text+0x334): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x3db): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var':
dso_dlfcn.c:(.text+0x454): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x4fb): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
dso_dlfcn.c:(.text+0x569): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x5cb): undefined reference to `dlclose'
dso_dlfcn.c:(.text+0x603): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr':
dso_dlfcn.c:(.text+0x69f): undefined reference to `dladdr'
dso_dlfcn.c:(.text+0x709): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_unload':
dso_dlfcn.c:(.text+0x762): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
example/CMakeFiles/https_client_verify_peer.dir/build.make:97: recipe for target 'example/example/https_client_verify_peer' failed
make[2]: *** [example/example/https_client_verify_peer] Error 1
CMakeFiles/Makefile2:223: recipe for target 'example/CMakeFiles/https_client_verify_peer.dir/all' failed
make[1]: *** [example/CMakeFiles/https_client_verify_peer.dir/all] Error 2
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
dso_dlfcn.c:(.text+0x11): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x24): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x2f): undefined reference to `dlclose'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func':
dso_dlfcn.c:(.text+0x334): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x3db): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var':
dso_dlfcn.c:(.text+0x454): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x4fb): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
dso_dlfcn.c:(.text+0x569): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x5cb): undefined reference to `dlclose'
dso_dlfcn.c:(.text+0x603): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr':
dso_dlfcn.c:(.text+0x69f): undefined reference to `dladdr'
dso_dlfcn.c:(.text+0x709): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_unload':
dso_dlfcn.c:(.text+0x762): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
example/CMakeFiles/https_service.dir/build.make:97: recipe for target 'example/example/https_service' failed
make[2]: *** [example/example/https_service] Error 1
CMakeFiles/Makefile2:260: recipe for target 'example/CMakeFiles/https_service.dir/all' failed
make[1]: *** [example/CMakeFiles/https_service.dir/all] Error 2
[  8%] Linking CXX executable example/web_socket
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_globallookup':
dso_dlfcn.c:(.text+0x11): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x24): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x2f): undefined reference to `dlclose'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_func':
dso_dlfcn.c:(.text+0x334): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x3db): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_bind_var':
dso_dlfcn.c:(.text+0x454): undefined reference to `dlsym'
dso_dlfcn.c:(.text+0x4fb): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_load':
dso_dlfcn.c:(.text+0x569): undefined reference to `dlopen'
dso_dlfcn.c:(.text+0x5cb): undefined reference to `dlclose'
dso_dlfcn.c:(.text+0x603): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_pathbyaddr':
dso_dlfcn.c:(.text+0x69f): undefined reference to `dladdr'
dso_dlfcn.c:(.text+0x709): undefined reference to `dlerror'
../../dependency/openssl/libcrypto.a(dso_dlfcn.o): In function `dlfcn_unload':
dso_dlfcn.c:(.text+0x762): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
example/CMakeFiles/web_socket.dir/build.make:97: recipe for target 'example/example/web_socket' failed
make[2]: *** [example/example/web_socket] Error 1
CMakeFiles/Makefile2:186: recipe for target 'example/CMakeFiles/web_socket.dir/all' failed
make[1]: *** [example/CMakeFiles/web_socket.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2

它找到了库，所以我不知道如何解决这个问题。

更新:我安装了 ssl 和加密库

sudo apt-get install libssl-dev
cmake -DBUILD_TESTS=YES -DBUILD_EXAMPLES=YES -DBUILD_SSL=YES -DCMAKE_INSTALL_PREFIX=static ..

现在它可以工作了，但是当我想编译一个支持 https 的示例时，我仍然需要将它与 -lssl 和 -lcrypto 链接，但这可能是因为 ssl 和 crypto 是共享库。

g++ -std=c++11 -I/home/jova/git/restbed/build/static/include https_service.cpp -L/home/jova/git/restbed/build/static/library -lrestbed -lssl -lcrypto -pthread

如何在 restbed.a 静态库中获得 ssl 支持？还是我总是必须使用 ssl 和加密链接？

我很困惑这个选项 -DBUILD_SSL=YES/NO 有什么作用？

Answer 1

您的问题看起来是链接问题。尝试添加 -ldl。

dlopen and friends