鏈接庫

Question

我剛剛開始Linux編程。 我正在嘗試編譯一個名為“ spider”的程序，以搜索某種類型的正則表達式。 所需的庫是PCRE，OpenSSL和libexpat。 我已經安裝了庫，由於某些原因它們未鏈接。

spider.c: In function ‘craft_csv_entry’:
spider.c:1261: warning: format ‘%lld’ expects type ‘long long int’, but argument 4 has type ‘__off_t’
spider.c:1261: warning: format ‘%lld’ expects type ‘long long int’, but argument 4 has type ‘__off_t’
spider.c: In function ‘read_maxgroups’:
spider.c:2218: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘XML_Size’
/tmp/ccZ2CUHF.o: In function `main':
spider.c:(.text+0xd2): undefined reference to `pcre_callout'
/tmp/ccZ2CUHF.o: In function `load_regexes':
spider.c:(.text+0x3db): undefined reference to `pcre_compile'
spider.c:(.text+0x440): undefined reference to `pcre_study'
/tmp/ccZ2CUHF.o: In function `compile_regexes':
spider.c:(.text+0x4d3): undefined reference to `pcre_compile'
spider.c:(.text+0x4f5): undefined reference to `pcre_study'
spider.c:(.text+0x52f): undefined reference to `pcre_compile'
spider.c:(.text+0x551): undefined reference to `pcre_study'
spider.c:(.text+0x58b): undefined reference to `pcre_compile'
spider.c:(.text+0x5ad): undefined reference to `pcre_study'
/tmp/ccZ2CUHF.o: In function `is_match':
spider.c:(.text+0xad2): undefined reference to `pcre_exec'
spider.c:(.text+0xb6e): undefined reference to `pcre_exec'
spider.c:(.text+0xc0a): undefined reference to `pcre_exec'
spider.c:(.text+0xcbc): undefined reference to `pcre_exec'
/tmp/ccZ2CUHF.o: In function `set_globals':
spider.c:(.text+0x1e95): undefined reference to `log'
spider.c:(.text+0x1ed1): undefined reference to `pow'
/tmp/ccZ2CUHF.o: In function `craft_csv_entry':
spider.c:(.text+0x21fa): undefined reference to `MD5_Init'
spider.c:(.text+0x225d): undefined reference to `MD5_Update'
spider.c:(.text+0x22b2): undefined reference to `MD5_Final'
/tmp/ccZ2CUHF.o: In function `read_maxgroups':
spider.c:(.text+0x4498): undefined reference to `XML_ParserCreateNS'
spider.c:(.text+0x4513): undefined reference to `XML_SetUserData'
spider.c:(.text+0x452e): undefined reference to `XML_SetElementHandler'
spider.c:(.text+0x4549): undefined reference to `XML_SetNamespaceDeclHandler'
spider.c:(.text+0x45b6): undefined reference to `XML_GetBuffer'
spider.c:(.text+0x466a): undefined reference to `XML_ParseBuffer'
spider.c:(.text+0x4679): undefined reference to `XML_GetErrorCode'
spider.c:(.text+0x4681): undefined reference to `XML_ErrorString'
spider.c:(.text+0x468e): undefined reference to `XML_GetCurrentLineNumber'
/tmp/ccZ2CUHF.o: In function `spider_encrypt':
spider.c:(.text+0x491c): undefined reference to `EVP_CIPHER_CTX_init'
spider.c:(.text+0x4921): undefined reference to `EVP_bf_cbc'
spider.c:(.text+0x4943): undefined reference to `EVP_EncryptInit'
spider.c:(.text+0x499d): undefined reference to `EVP_EncryptUpdate'
spider.c:(.text+0x4a2e): undefined reference to `EVP_EncryptFinal'
spider.c:(.text+0x4a81): undefined reference to `EVP_CIPHER_CTX_cleanup'
/tmp/ccZ2CUHF.o: In function `spider_decrypt':
spider.c:(.text+0x4b82): undefined reference to `EVP_CIPHER_CTX_init'
spider.c:(.text+0x4b87): undefined reference to `EVP_bf_cbc'
spider.c:(.text+0x4ba9): undefined reference to `EVP_DecryptInit'
spider.c:(.text+0x4be4): undefined reference to `EVP_DecryptUpdate'
spider.c:(.text+0x4c9d): undefined reference to `EVP_DecryptFinal'
spider.c:(.text+0x4d26): undefined reference to `EVP_CIPHER_CTX_cleanup'
collect2: ld returned 1 exit status

Answer 1

嘗試這個：

gcc -o spider spider.c -I/usr/local/include -I/usr/include -L/usr/local/lib -L/usr/lib -lpcre -lssl -lcrypto -lexpat

Answer 2

您需要顯式鏈接到庫。 您可能需要添加-llibpcre -llibssl和-llibexpat ，但是這些名稱可能有所不同（基於庫的libname-這些名稱應與您安裝的軟件包的名稱相同，或者與它們適用的.a和。這樣的文件）