为ARM编译时openssl无法编译，否则工作正常

Question

所以最近我一直在为ARM编译一个rust项目。它可以完美地为 x86 编译，但每当我切换到 ARM 目标时，它都找不到 Openssl 安装，我已经安装了 pkg-config 并正在运行，所以它不是那个错误。不确定如何成功设置 OPENSSL_DIR 变量或自己在哪里找到安装。错误已完整粘贴在下面

error: failed to run custom build command for `openssl-sys v0.9.61`

Caused by:
  process didn't exit successfully: `/home/bob/yagna/blueberry/debug/build/openssl-sys-aae22c7790b14724/build-script-main` (exit code: 101)
  --- stdout
  cargo:rustc-cfg=const_fn
  cargo:rerun-if-env-changed=ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_LIB_DIR
  ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_LIB_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_LIB_DIR
  OPENSSL_LIB_DIR unset
  cargo:rerun-if-env-changed=ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_INCLUDE_DIR
  ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_INCLUDE_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_INCLUDE_DIR
  OPENSSL_INCLUDE_DIR unset
  cargo:rerun-if-env-changed=ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_DIR
  ARMV7_UNKNOWN_LINUX_GNUEABIHF_OPENSSL_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_DIR
  OPENSSL_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_armv7-unknown-linux-gnueabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_armv7_unknown_linux_gnueabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_armv7-unknown-linux-gnueabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_armv7_unknown_linux_gnueabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_armv7-unknown-linux-gnueabihf
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_armv7_unknown_linux_gnueabihf
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  run pkg_config fail: "pkg-config has not been configured to support cross-compilation.\n\n                Install a sysroot for the target platform and configure it via\n                PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a\n                cross-compiling wrapper for pkg-config and set it via\n                PKG_CONFIG environment variable."

  --- stderr
  thread 'main' panicked at '

  Could not find directory of OpenSSL installation, and this `-sys` crate cannot
  proceed without this knowledge. If OpenSSL is installed and this crate had
  trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
  compilation process.

  Make sure you also have the development packages of openssl installed.
  For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora.

  If you're in a situation where you think the directory *should* be found
  automatically, please open a bug at https://github.com/sfackler/rust-openssl
  and include information about your system as well as this message.

  $HOST = x86_64-unknown-linux-gnu
  $TARGET = armv7-unknown-linux-gnueabihf
  openssl-sys = 0.9.61

  ', /home/bob/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-sys-0.9.61/build/find_normal.rs:174:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

.cargo配置文件也如下

[build]
target-dir="/home/bob/yagna/blueberry"
target="armv7-unknown-linux-gnueabihf"
linker = "arm-linux-gnueabihf-gcc"
[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

不知所措，在这个 ubuntu 上，我安装了 libssl-dev 并且是最新的，添加了目标并使用 rustup 和 sudo apt get 进行安装。不知道如何解决这个问题

Answer 1

如果您正在使用 OpenSSL 编译某些内容armhf，那么您需要libssl-dev为该架构安装该软件包。这将涉及通过设置 dpkgdpkg --add-architecture armhf然后执行apt-get updateand apt-get install libssl-dev:armhf。

请注意，可能无法libssl-dev一次安装多个版本，并且以不最终删除大量软件包的方式解决依赖关系可能会很棘手。Debian 风格的多体系结构非常强大，但有时可能有点繁琐。

您绝对不应该供应 OpenSSL，因为它经常发布安全更新。同样，静态链接 OpenSSL 也是一个坏主意。如果您使用供应商或静态链接它，除非您非常小心地使其保持最新，否则您的代码将包含安全漏洞。