我刚刚将我的开发机器从Gentoo切换到Arch Linux，当我尝试编译我的项目的新版本时，链接失败：
clang -O0 -g -pipe -Wall -DDEBUG -o slug announce.o bitfield.o main.o metadata.o network.o parser.o peer.o piece.o scheduler.o torrent.o url.o util.o -I. -lssl -lm -lcurl -levent
/usr/bin/ld.gold: metadata.o: in function get_info_hash:metadata.c:186: error: undefined reference to 'SHA1_Init'
/usr/bin/ld.gold: metadata.o: in function get_info_hash:metadata.c:187: error: undefined reference to 'SHA1_Update'
/usr/bin/ld.gold: metadata.o: in function get_info_hash:metadata.c:188: error: undefined reference to 'SHA1_Final'
/usr/bin/ld.gold: piece.o: in function verify_piece:piece.c:40: error: undefined reference to 'SHA1_Init'
/usr/bin/ld.gold: piece.o: in function verify_piece:piece.c:41: error: undefined reference to 'SHA1_Update'
/usr/bin/ld.gold: piece.o: in function verify_piece:piece.c:42: error: undefined reference to 'SHA1_Final'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [slug] Error 1
整个来源都在GitHub上：https://github.com/robertseaton/slug。
答案 0 :(得分：8)
看起来你错过了-lcrypto
答案 1 :(得分：5)
根据我的经验，-lssl或-lcrypto的位置可能是问题的根源。尝试将-lcrypto选项推送到gcc选项的末尾，或者在输入目标文件之前。