为 ARM 编译时 Openssl 无法编译，否则工作正常

Question

所以最近一直在为ARM编译一个rust项目。它为 x86 完美编译，但每当我切换到 ARM 目标时，它找不到 Openssl 安装，我安装了 pkg-config 并正常工作，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。错误完整贴在下面

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，ubuntu，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 安装。不确定如何解决这个问题

Answer 1

如果您使用 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，可能无法一次安装 libssl-dev 的多个版本，并且以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 风格的多体系结构非常强大，但有时可能有点笨拙。

您绝对不应该出售 OpenSSL，因为它经常随安全更新一起发布。同样，静态 link OpenSSL 也是一个坏主意。如果你做供应商或静态 link 它，除非你非常小心地保持它是最新的，否则你的代码将包含安全漏洞。

为 ARM 编译时 Openssl 无法编译，否则工作正常

Openssl can't compile when compiling for ARM, otherwise works fine

ubuntu

openssl

arm

rust