libcurl.a(libcurl_la-openssl.o): in function `ossl_connect_step1':
openssl.c:(.text+0x3ca8): undefined reference to `SSLv3_client_method'
我个人环境原因：编译选项指定了某个openssl目录，此目录下有libcrypto.a libssl.a
解决方法：删除这些-Lxxxx目录编译选项。
libcurl.a(libcurl_la-openssl.o): undefined reference to symbol 'X509_LOOKUP_file@@OPENSSL_1_1_0'
/usr/bin/ld: /usr/lib64/libcrypto.so.1.1: error adding symbols: DSO missing from command line
解决方法：增加 -lssl -lcrypto
以下的错误也是增加 -lssl -lcrypto
libcurl.a(libcurl_la-openssl.o): in function `Curl_ossl_shutdown':
openssl.c:(.text+0x182c): undefined reference to `SSL_free'
/usr/bin/ld: openssl.c:(.text+0x186c): undefined reference to `SSL_read'
/usr/bin/ld: openssl.c:(.text+0x187c): undefined reference to `SSL_get_error'
/usr/bin/ld: openssl.c:(.text+0x18c4): undefined reference to `SSL_get_shutdown'
/usr/bin/ld: openssl.c:(.text+0x1980): undefined reference to `SSL_shutdown'
/usr/bin/ld: ../../../linux/../os_public//Lib//libcurl.a(libcurl_la-openssl.o): in function `servercert':
openssl.c:(.text+0x1a78): undefined reference to `SSL_get_peer_certificate'
/usr/bin/ld: openssl.c:(.text+0x1e8c): undefined reference to `PEM_read_bio_X509'
/usr/bin/ld: openssl.c:(.text+0x1ee0): undefined reference to `SSL_get_verify_result'
/usr/bin/ld: openssl.c:(.text+0x1f1c): undefined reference to `X509_verify_cert_error_string'
/usr/bin/ld: openssl.c:(.text+0x201c): undefined reference to `SSL_get_peer_cert_chain'
/usr/bin/ld: openssl.c:(.text+0x24c0): undefined reference to `SSL_ctrl'
/usr/bin/ld: openssl.c:(.text+0x24e8): undefined reference to `OCSP_response_status'
/usr/bin/ld: openssl.c:(.text+0x24f8): undefined reference to `OCSP_response_get1_basic'
/usr/bin/ld: openssl.c:(.text+0x2510): undefined reference to `SSL_get_peer_cert_chain'
/usr/bin/ld: openssl.c:(.text+0x2520): undefined reference to `SSL_CTX_get_cert_store'
/usr/bin/ld: openssl.c:(.text+0x2534): undefined reference to `OCSP_basic_verify'
/usr/bin/ld: openssl.c:(.text+0x2560): undefined reference to `OCSP_resp_count'
/usr/bin/ld: openssl.c:(.text+0x2574): undefined reference to `OCSP_resp_get0'
/usr/bin/ld: openssl.c:(.text+0x2588): undefined reference to `OCSP_single_get0_status'
/usr/bin/ld: openssl.c:(.text+0x259c): undefined reference to `OCSP_check_validity'
/usr/bin/ld: openssl.c:(.text+0x25a8): undefined reference to `OCSP_cert_status_str'
/usr/bin/ld: openssl.c:(.text+0x29c8): undefined reference to `PEM_write_bio_X509'
/usr/bin/ld: openssl.c:(.text+0x2f3c): undefined reference to `OCSP_response_status_str'
/usr/bin/ld: openssl.c:(.text+0x303c): undefined reference to `X509_verify_cert_error_string'
/usr/bin/ld: openssl.c:(.text+0x306c): undefined reference to `OCSP_crl_reason_str'
/usr/bin/ld: ../../../linux/../os_public//Lib//libcurl.a(libcurl_la-openssl.o): in function `ossl_connect_step2':
openssl.c:(.text+0x3244): undefined reference to `SSL_connect'
/usr/bin/ld: openssl.c:(.text+0x325c): undefined reference to `SSL_get_error'
/usr/bin/ld: openssl.c:(.text+0x32c8): undefined reference to `SSL_get_verify_result'
/usr/bin/ld: openssl.c:(.text+0x337c): undefined reference to `SSL_version'
/usr/bin/ld: openssl.c:(.text+0x33e8): undefined reference to `SSL_get_current_cipher'
/usr/bin/ld: openssl.c:(.text+0x33f0): undefined reference to `SSL_CIPHER_get_name'
/usr/bin/ld: openssl.c:(.text+0x342c): undefined reference to `SSL_get0_alpn_selected'
/usr/bin/ld: openssl.c:(.text+0x359c): undefined reference to `X509_verify_cert_error_string'
/usr/bin/ld: ../../../linux/../os_public//Lib//libcurl.a(libcurl_la-openssl.o): in function `ossl_recv':
openssl.c:(.text+0x3708): undefined reference to `SSL_read'
/usr/bin/ld: openssl.c:(.text+0x373c): undefined reference to `SSL_get_error'
/usr/bin/ld: ../../../linux/../os_public//Lib//libcurl.a(libcurl_la-openssl.o): in function `ossl_connect_step1':
openssl.c:(.text+0x39c0): undefined reference to `TLS_client_method'
/usr/bin/ld: openssl.c:(.text+0x39ec): undefined reference to `SSL_CTX_free'
/usr/bin/ld: openssl.c:(.text+0x39fc): undefined reference to `SSL_CTX_new'
/usr/bin/ld: openssl.c:(.text+0x3a24): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x3a98): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x3ab0): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x3ac8): undefined reference to `SSL_CTX_set_options'
/usr/bin/ld: openssl.c:(.text+0x3b50): undefined reference to `SSL_CTX_set_default_passwd_cb_userdata'
/usr/bin/ld: openssl.c:(.text+0x3b60): undefined reference to `SSL_CTX_set_default_passwd_cb'
/usr/bin/ld: openssl.c:(.text+0x3ca8): undefined reference to `SSLv3_client_method'
/usr/bin/ld: openssl.c:(.text+0x3eac): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x3ef8): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x3f1c): undefined reference to `SSL_CTX_set_next_proto_select_cb'
/usr/bin/ld: openssl.c:(.text+0x3fa8): undefined reference to `SSL_free'
/usr/bin/ld: openssl.c:(.text+0x3fe0): undefined reference to `SSL_CTX_set_ciphersuites'
/usr/bin/ld: openssl.c:(.text+0x4014): undefined reference to `SSL_CTX_set_post_handshake_auth'
/usr/bin/ld: openssl.c:(.text+0x404c): undefined reference to `SSL_CTX_get_cert_store'
/usr/bin/ld: openssl.c:(.text+0x4054): undefined reference to `X509_LOOKUP_file'
/usr/bin/ld: openssl.c:(.text+0x4074): undefined reference to `X509_load_crl_file'
/usr/bin/ld: openssl.c:(.text+0x409c): undefined reference to `SSL_CTX_get_cert_store'
/usr/bin/ld: openssl.c:(.text+0x40f0): undefined reference to `SSL_CTX_set_verify'
/usr/bin/ld: openssl.c:(.text+0x4118): undefined reference to `SSL_CTX_set_keylog_callback'
/usr/bin/ld: openssl.c:(.text+0x4138): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x414c): undefined reference to `SSL_CTX_sess_set_new_cb'
/usr/bin/ld: openssl.c:(.text+0x41a4): undefined reference to `SSL_free'
/usr/bin/ld: openssl.c:(.text+0x41b0): undefined reference to `SSL_new'
/usr/bin/ld: openssl.c:(.text+0x41e8): undefined reference to `SSL_set_connect_state'
/usr/bin/ld: openssl.c:(.text+0x4238): undefined reference to `BIO_f_ssl'
/usr/bin/ld: openssl.c:(.text+0x4268): undefined reference to `SSL_set_bio'
/usr/bin/ld: openssl.c:(.text+0x4290): undefined reference to `SSL_CTX_set_cipher_list'
/usr/bin/ld: openssl.c:(.text+0x4318): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x4334): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x4350): undefined reference to `SSL_CTX_set_msg_callback'
/usr/bin/ld: openssl.c:(.text+0x4368): undefined reference to `SSL_CTX_ctrl'
/usr/bin/ld: openssl.c:(.text+0x43b8): undefined reference to `SSL_CTX_set_alpn_protos'
/usr/bin/ld: openssl.c:(.text+0x4468): undefined reference to `SSL_CTX_set_srp_username'
/usr/bin/ld: openssl.c:(.text+0x4488): undefined reference to `SSL_CTX_set_srp_password'
/usr/bin/ld: openssl.c:(.text+0x44d4): undefined reference to `SSL_CTX_set_cipher_list'
/usr/bin/ld: openssl.c:(.text+0x45a0): undefined reference to `SSL_CTX_load_verify_locations'
/usr/bin/ld: openssl.c:(.text+0x4654): undefined reference to `SSL_set_fd'
/usr/bin/ld: openssl.c:(.text+0x46ac): undefined reference to `SSL_CTX_use_certificate_chain_file'
/usr/bin/ld: openssl.c:(.text+0x4750): undefined reference to `SSL_ctrl'
/usr/bin/ld: openssl.c:(.text+0x479c): undefined reference to `SSL_ctrl'
/usr/bin/ld: openssl.c:(.text+0x47f0): undefined reference to `SSL_set_ex_data'
/usr/bin/ld: openssl.c:(.text+0x4808): undefined reference to `SSL_set_ex_data'
/usr/bin/ld: openssl.c:(.text+0x4844): undefined reference to `SSL_set_session'
/usr/bin/ld: openssl.c:(.text+0x4950): undefined reference to `SSL_CTX_use_certificate_file'
/usr/bin/ld: openssl.c:(.text+0x4a34): undefined reference to `SSL_CTX_get_cert_store'
/usr/bin/ld: openssl.c:(.text+0x4b14): undefined reference to `SSL_CTX_use_PrivateKey_file'
/usr/bin/ld: openssl.c:(.text+0x4b5c): undefined reference to `SSL_new'
/usr/bin/ld: openssl.c:(.text+0x4b68): undefined reference to `SSL_get_certificate'
/usr/bin/ld: openssl.c:(.text+0x4b80): undefined reference to `SSL_get_privatekey'
/usr/bin/ld: openssl.c:(.text+0x4b9c): undefined reference to `SSL_get_privatekey'
/usr/bin/ld: openssl.c:(.text+0x4bb4): undefined reference to `SSL_free'
/usr/bin/ld: openssl.c:(.text+0x4bbc): undefined reference to `SSL_CTX_check_private_key'
/usr/bin/ld: openssl.c:(.text+0x4c0c): undefined reference to `SSL_CTX_use_certificate'
/usr/bin/ld: openssl.c:(.text+0x4d8c): undefined reference to `SSL_CTX_use_PrivateKey'
/usr/bin/ld: openssl.c:(.text+0x4e18): undefined reference to `SSL_CTX_use_certificate'
/usr/bin/ld: openssl.c:(.text+0x4f40): undefined reference to `SSL_CTX_use_PrivateKey'
/usr/bin/ld: openssl.c:(.text+0x4fa0): undefined reference to `SSL_CTX_check_private_key'
/usr/bin/ld: openssl.c:(.text+0x4fc8): undefined reference to `SSL_CTX_add_client_CA'
/usr/bin/ld: openssl.c:(.text+0x4fe0): undefined reference to `SSL_CTX_ctrl'