为ARM编译时，Openssl无法编译，否则可以正常工作

Question

所以最近我一直在为ARM编译一个rust项目。它对x86的编译非常完美，但是每当我切换到ARM目标时，它都找不到Openssl安装，我已经安装了pkg-config并且可以正常工作，所以这不是那个错误。我自己也不确定如何成功设置OPENSSL_DIR变量，也不知道在哪里可以找到安装程序。错误将完全粘贴在下面

​

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配置文件也如下所示

​

[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，这个ubuntu，我已经安装了libssl-dev和最新的，目标是添加和安装使用rustup和sudo apt get。不确定如何修复此问题

Answer 1

如果您正在使用OpenSSL为armhf编译某些东西，那么您需要为该体系结构安装libssl-dev包。这将涉及到通过dpkg --add-architecture armhf为其设置dpkg，然后执行apt-get update和apt-get install libssl-dev:armhf。

请注意，一次安装多个版本的libssl-dev可能是不可能的，而且以一种不会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multiarch非常有能力，但有时可能有点麻烦。

您绝对不应该提供OpenSSL，因为它经常发布安全更新。同样，静态链接OpenSSL也不是一个好主意。如果您使用供应商或静态链接，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。