轉自：https://www.javaroad.cn/questions/121768
我在Debian機器上，我想為我的Raspberry Pi 2交叉編譯一個項目 . 我已經設法用一個簡單的hello世界使用rustup，但無法弄清楚如何交叉編譯rust-openssl crate .
我用arm-linux-gnueabihf-gcc編譯了openssl并將其安裝在我的 home/opensslArm 目錄中 .
我跑的時候
OPENSSL_LIB_DIR=/home/johann/opensslArm/lib OPENSSL_INCLUDE_DIR=/home/johann/opensslArm/include cargo build --target=armv7-unknown-linux-gnueabihf
我收到此錯誤：
failed to run custom build command for `openssl-sys-extras v0.7.11` Process didn't exit successfully: `/home/johann/projects/test/target/debug/build/openssl-sys-extras-e1c84960cd35bc93/build-script-build` (exit code: 101) --- stdout TARGET = Some("armv7-unknown-linux-gnueabihf") OPT_LEVEL = Some("0") PROFILE = Some("debug") TARGET = Some("armv7-unknown-linux-gnueabihf") debug=true opt-level=0 HOST = Some("x86_64-unknown-linux-gnu") TARGET = Some("armv7-unknown-linux-gnueabihf") TARGET = Some("armv7-unknown-linux-gnueabihf") HOST = Some("x86_64-unknown-linux-gnu") CC_armv7-unknown-linux-gnueabihf = None CC_armv7_unknown_linux_gnueabihf = None TARGET_CC = None CC = None HOST = Some("x86_64-unknown-linux-gnu") TARGET = Some("armv7-unknown-linux-gnueabihf") HOST = Some("x86_64-unknown-linux-gnu") CFLAGS_armv7-unknown-linux-gnueabihf = None CFLAGS_armv7_unknown_linux_gnueabihf = None TARGET_CFLAGS = None CFLAGS = None running: "arm-linux-gnueabihf-gcc" "-O0" "-ffunction-sections" "-fdata-sections" "-g" "-fPIC" "-march=armv7-a" "-o" "/home/johann/projects/test/target/armv7-unknown-linux-gnueabihf/debug/build/openssl-sys-extras-e1c84960cd35bc93/out/src/openssl_shim.o" "-c" "src/openssl_shim.c" ExitStatus(ExitStatus(256)) command did not execute successfully, got: exit code: 1 --- stderr In file included from src/openssl_shim.c:1:0: /usr/include/openssl/hmac.h:61:34: fatal error: openssl/opensslconf.h: No such file or directory compilation terminated. thread '<main>' panicked at 'explicit panic', /home/johann/.cargo/registry/src/github.com-88ac128001ac3a9a/gcc-0.3.28/src/lib.rs:840 note: Run with `RUST_BACKTRACE=1` for a backtrace.
如果我導出有問題的變量，我會得到相同的錯誤 .
我不知道我應該做什么，我不是交叉編譯的專家 . 有沒有人設法做到這一點？
編輯：我使用的是rust-openssl 0.7.11 . 升級到0.7.13修復了這個問題（我現在可以看到貨物編譯rust-openssl依賴而沒有錯誤）但我現在又有另一個：
error: linking with `arm-linux-gnueabihf-gcc` failed: exit code: 1 ... note: /usr/lib/gcc-cross/arm-linux-gnueabihf/5/../../../../arm-linux-gnueabihf/bin/ld: /home/johann/opensslArm/lib/libssl.a(s23_meth.o): relocation R_ARM_THM_MOVW_ABS_NC against `a local symbol' can not be used when making a shared object; recompile with -fPIC /home/johann/opensslArm/lib/libssl.a: error adding symbols: Bad value
如何添加 -fPIC 標志？我應該使用特定標志重新編譯opensslArm嗎？
回答：
配置openssl編譯時必須傳遞 shared 選項（這將使 -fPIC 參數傳遞給編譯器） .
這是一系列命令，我用它來測試交叉編譯打印openssl版本的Rust程序：
cd /tmp wget https://www.openssl.org/source/openssl-1.0.1t.tar.gz tar xzf openssl-1.0.1t.tar.gz export MACHINE=armv7 export ARCH=arm export CC=arm-linux-gnueabihf-gcc cd openssl-1.0.1t && ./config shared && make && cd - export OPENSSL_LIB_DIR=/tmp/openssl-1.0.1t/ export OPENSSL_INCLUDE_DIR=/tmp/openssl-1.0.1t/include cargo new xx --bin cd xx mkdir .cargo cat > .cargo/config << EOF [target.armv7-unknown-linux-gnueabihf] linker = "arm-linux-gnueabihf-gcc" EOF cat > src/main.rs << EOF extern crate openssl; fn main() { println!("{}", openssl::version::version()) } EOF cargo add openssl # requires cargo install cargo-add cargo build --target armv7-unknown-linux-gnueabihf
Testing the compiled program on the host computer
Setting OPENSSL_STATIC 使 rust-openssl 靜態鏈接 . 如果使用 rust-openssl 的靜態鏈接版本，為armhf（ crossbuild-essential-armhf on Debian）和 qemu-static 安裝libc，則可以使用以下命令運行已編譯的程序：
qemu-arm-static target/armv7-unknown-linux-gnueabihf/debug/xx
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