c++ - 将Rust项目链接到与其他cmake项目链接的cmake项目

Question

我正在使用cmake crate 来编译CMake项目，该项目依赖并编译其他CMake项目
这是我的build.rs:

extern crate cmake;
use cmake::Config;

fn main() {
    let dst = Config::new("src/cpp")
        .define("COMPILE_TARGET", "DESKTOP_x86_64")
        .define("FLAVOR", "DESKTOP")
        .define("LIBOPENVPN3_NOT_BUILD_EXAMPLES", "TRUE")
        .build();

    println!("cargo:rustc-link-search=native={}", dst.display());
    println!("cargo:rustc-link-lib=static=libopenvpn3");
    println!("cargo:rustc-link-lib=dylib=stdc++");
}

这是我的 src/cpp/CMakeLists.txt编译 libopenvpn3的方式

add_library(libopenvpn3 SHARED OpenVpnInstance.cpp)
target_link_libraries(libopenvpn3 crypto ssl lzo lz4 tins)

但是，当我使用 cargo build构建时，我从所有这些库中获得了对对象的 undefined reference : crypto ssl lzo lz4 tins。
我也尝试过制作 libopenvpn3 STATIC，因此最终的 libopenvpn3将包括所有需要的库: crypto, ssl, lzo, lz4, tins，像这样: add_library(libopenvpn3 STATIC OpenVpnInstance.cpp)，但是我仍然收到错误。我认为其他库( crypto, ssl, lzo, lz4, tins)也将仅包含在 libopenvpn3中(如果它们也是静态的)。或不？
无论如何，我认为我应该重新链接到 build.rs上的这些库，如下所示:

println!("cargo:rustc-link-lib=dylib=openvpn");
println!("cargo:rustc-link-lib=dylib=crypto");
println!("cargo:rustc-link-lib=dylib=lzo");
println!("cargo:rustc-link-lib=dylib=lz4");
println!("cargo:rustc-link-lib=dylib=tins");

但是我不知道它们在哪里，因为它们是从 CMakeLists.txt生成的，并且我不认为对生成它们的路径进行硬编码是个好主意。
我在这里该怎么办？
更新:
错误示例:

  /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/openvpn3/openvpn3/openvpn/openssl/util/pem.hpp:66: undefined reference to `BIO_new_mem_buf'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/openvpn3/openvpn3/openvpn/openssl/util/pem.hpp:73: undefined reference to `PEM_read_bio'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/openvpn3/openvpn3/openvpn/openssl/util/pem.hpp:91: undefined reference to `CRYPTO_free'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/openvpn3/openvpn3/openvpn/openssl/util/pem.hpp:92: undefined reference to `CRYPTO_free'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/openvpn3/openvpn3/openvpn/openssl/util/pem.hpp:93: undefined reference to `CRYPTO_free'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/openvpn3/openvpn3/openvpn/openssl/util/pem.hpp:95: undefined reference to `BIO_free'
  /usr/bin/ld: /home/dev/orwell/lab/hyper_vpn/target/debug/deps/liblibopenvpn3-7498dcb6c355a9d6.rlib(OpenVpnInstance.cpp.o): in function `SimplePacketCrafter::replaceSourceAddressIpv4(unsigned char*, unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
  /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/SimplePacketCrafter.h:117: undefined reference to `Tins::IP::IP(unsigned char const*, unsigned int)'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/SimplePacketCrafter.h:118: undefined reference to `Tins::IPv4Address::IPv4Address(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/SimplePacketCrafter.h:118: undefined reference to `Tins::IP::src_addr(Tins::IPv4Address)'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/SimplePacketCrafter.h:119: undefined reference to `Tins::PDU::serialize()'
  /usr/bin/ld: /home/dev/orwell/lab/hyper_vpn/target/debug/deps/liblibopenvpn3-7498dcb6c355a9d6.rlib(OpenVpnInstance.cpp.o): in function `Tins::IP::~IP()':
  /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/libtins/include/tins/ip.h:63: undefined reference to `vtable for Tins::IP'
  /usr/bin/ld: /home/dev/orwell/liborwell_rust/src/libopenvpn3/src/cpp/libtins/include/tins/ip.h:63: undefined reference to `Tins::PDU::~PDU()'

Answer 1

在CMakeLists.txt上，我正在执行以下操作:

install(TARGETS libopenvpn3 DESTINATION .)

但后来我做到了

install(TARGETS libopenvpn3 crypto ssl lzo lz4 tins DESTINATION .)

所以它会安装所有需要的库
然后，此 build.rs起作用:

extern crate cmake;
use cmake::Config;

fn main() {
    let dst = Config::new("src/cpp")
        .define("COMPILE_TARGET", "DESKTOP_x86_64")
        .define("FLAVOR", "DESKTOP")
        .define("LIBOPENVPN3_NOT_BUILD_EXAMPLES", "TRUE")
        .build();

    println!("cargo:rustc-link-search=native={}", dst.display());
    println!("cargo:rustc-link-lib=dylib=stdc++");
    println!("cargo:rustc-link-lib=static=libopenvpn3");
    println!("cargo:rustc-link-lib=static=crypto");
    println!("cargo:rustc-link-lib=static=lzo");
    println!("cargo:rustc-link-lib=static=lz4");
    println!("cargo:rustc-link-lib=static=tins");
    println!("cargo:rustc-link-lib=static=ssl");
}

但是，我不知道为什么我必须在Rust中再次将它们链接起来。它们应该包含在libopenvpn3中，因为它们是静态的，不是吗？