将 Rust 项目链接到链接到其他 cmake 项目的 cmake 项目

Question

我正在使用 cmake crate 编译一个依赖并编译其他 CMake 项目的 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++");
}

这就是我的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，我会从所有这些库中获得对对象的未定义引用：crypto ssl lzo lz4 tins。

我也尝试过创建libopenvpn3STATIC，所以最终的libopenvpn3 将包含所有需要的库：crypto, ssl, lzo, lz4, tins，就像这样：add_library(libopenvpn3 STATIC OpenVpnInstance.cpp)，但我仍然得到错误。我认为其他库（crypto, ssl, lzo, lz4, tins）只有在它们也是静态的情况下才会包含在libopenvpn3 中。还是不行？

无论如何，我认为我应该在build.rs 上重新链接这些库，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");

但我不知道它们在哪里，因为它们是从 CMakeLists.txt 生成的，而且我认为硬编码生成它们的路径不是一个好主意。

我应该在这里做什么？

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，我正在做：

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

那么，这个build.rs 有效：

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 中再次链接它们。它们应该包含在 libopenvpn3 中，因为它们是静态的，不是吗？