[英]What causes this link failure (undefined reference)?
我剛剛將我的開發機器從Gentoo切換到Arch Linux,當我嘗試編譯我的項目的新版本時,鏈接失敗:
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
整個源代碼在GitHub上: https : //github.com/robertseaton/slug 。
看起來你錯過了-lcrypto
根據我的經驗, -lssl
或-lcrypto
的位置可能是問題的根源。 嘗試將-lcrypto
選項推-lcrypto
gcc選項的末尾,或者在輸入對象文件之前。
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