构建含OpenSSL的Rust静态库（musl）时sigsetjmp未定义引用问题

错误详情 #

链接阶段出现以下错误：

/mnt/HDD/Project/inkbox-build/inkbox/compiled-binaries/arm-kobo-linux-gnueabihf/bin/../lib/gcc/arm-kobo-linux-gnueabihf/11.2.0/../../../../arm-kobo-linux-gnueabihf/bin/ld.bfd: /mnt/HDD/Project/inkbox-build/inkbox/inkbox-toreader/libs/Libretranslate-rs-to-cpp/lib//libLibretranslate_rs_to_cpp.a(armcap.o): in function `OPENSSL_cpuid_setup':
armcap.c:(.text.startup.OPENSSL_cpuid_setup+0xa2): undefined reference to `sigsetjmp'
/mnt/HDD/Project/inkbox-build/inkbox/compiled-binaries/arm-kobo-linux-gnueabihf/bin/../lib/gcc/arm-kobo-linux-gnueabihf/11.2.0/../../../../arm-kobo-linux-gnueabihf/bin/ld.bfd: armcap.c:(.text.startup.OPENSSL_cpuid_setup+0xae): undefined reference to `sigsetjmp'
/mnt/HDD/Project/inkbox-build/inkbox/compiled-binaries/arm-kobo-linux-gnueabihf/bin/../lib/gcc/arm-kobo-linux-gnueabihf/11.2.0/../../../../arm-kobo-linux-gnueabihf/bin/ld.bfd: armcap.c:(.text.startup.OPENSSL_cpuid_setup+0xf4): undefined reference to `sigsetjmp'
/mnt/HDD/Project/inkbox-build/inkbox/compiled-binaries/arm-kobo-linux-gnueabihf/bin/../lib/gcc/arm-kobo-linux-gnueabihf/11.2.0/../../../../arm-kobo-linux-gnueabihf/bin/ld.bfd: armcap.c:(.text.startup.OPENSSL_cpuid_setup+0x100): undefined reference to `sigsetjmp'
/mnt/HDD/Project/inkbox-build/inkbox/compiled-binaries/arm-kobo-linux-gnueabihf/bin/../lib/gcc/arm-kobo-linux-gnueabihf/11.2.0/../../../../arm-kobo-linux-gnueabihf/bin/ld.bfd: armcap.c:(.text.startup.OPENSSL_cpuid_setup+0x10c): undefined reference to `sigsetjmp'
/mnt/HDD/Project/inkbox-build/inkbox/compiled-binaries/arm-kobo-linux-gnueabihf/bin/../lib/gcc/arm-kobo-linux-gnueabihf/11.2.0/../../../../arm-kobo-linux-gnueabihf/bin/ld.bfd: /mnt/HDD/Project/inkbox-build/inkbox/inkbox-toreader/libs/Libretranslate-rs-to-cpp/lib//libLibretranslate_rs_to_cpp.a(armcap.o):armcap.c:(.text.startup.OPENSSL_cpuid_setup+0x118): more undefined references to `sigsetjmp' follow
collect2: error: ld returned 1 exit status
make: *** [Makefile:505: build/inkbox] Error 1

已知线索 #

相关Bug信息显示：

glibc（至少2.17版本）没有sigsetjmp函数实体，仅在特定条件下以宏的形式存在

当前使用的GLIBC版本并不老旧，且已尝试用zig编译本地非vendored的OpenSSL构建Rust库：

OPENSSL_DIR=/home/build/inkbox/openssl/ cargo zigbuild --target armv7-unknown-linux-musleabihf

但问题依旧。

解决方案 #

• 显式链接libc库：在C++程序的链接命令中添加-lc参数，确保链接器能找到sigsetjmp的实现。musl libc中sigsetjmp是函数实体，静态链接时需显式依赖libc。
• 禁用OpenSSL的CPUID检测：编译OpenSSL时添加no-cpuid配置选项，避免触发调用sigsetjmp的OPENSSL_cpuid_setup函数。例如：

  ./Configure --prefix=/home/build/inkbox/openssl no-cpuid armv7-unknown-linux-musleabihf
  

• 对齐目标环境：确认Rust库的编译目标（armv7-unknown-linux-musleabihf）与C++程序的编译目标（arm-kobo-linux-gnueabihf）的libc类型一致，避免musl与glibc混合导致的符号不兼容。
• 强制启用glibc宏定义：在编译OpenSSL或Rust库时，定义_GNU_SOURCE或_BSD_SOURCE宏，确保glibc的sigsetjmp宏被正确展开，替代函数调用。例如在Rust编译时添加环境变量：

  CFLAGS="-D_GNU_SOURCE" OPENSSL_DIR=/home/build/inkbox/openssl/ cargo zigbuild --target armv7-unknown-linux-musleabihf
  

内容的提问来源于stack exchange，提问作者Szybet