These warnings should be eliminated in order to make compilation readable:

CC (gcc) [M tls.so] tls_locking.o tls_locking.c:98:13: warning: 'locking_f' defined but not used [-Wunused-function] static void locking_f(int mode, int n, const char* file, int line) ^~~~~~~~~ tls_locking.c:83:13: warning: 'dyn_destroy_f' defined but not used [-Wunused-function] static void dyn_destroy_f(struct CRYPTO_dynlock_value *l, ^~~~~~~~~~~~~ tls_locking.c:65:13: warning: 'dyn_lock_f' defined but not used [-Wunused-function] static void dyn_lock_f(int mode, struct CRYPTO_dynlock_value* l, ^~~~~~~~~~ tls_locking.c:42:37: warning: 'dyn_create_f' defined but not used [-Wunused-function] static struct CRYPTO_dynlock_value* dyn_create_f(const char* file, int line) ^~~~~~~~~~~~

CC (gcc) [M tls.so] tls_init.o tls_init.c: In function 'init_ssl_methods': tls_init.c:377:2: warning: 'TLSv1_client_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_cli - 1] = TLSv1_client_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1598:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_client_method(void)) /* TLSv1.0 */ ^ tls_init.c:378:2: warning: 'TLSv1_server_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_srv - 1] = TLSv1_server_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1597:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_server_method(void)) /* TLSv1.0 */ ^ tls_init.c:379:2: warning: 'TLSv1_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1 - 1] = TLSv1_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1596:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_method(void)) /* TLSv1.0 */ ^ tls_init.c:382:2: warning: 'TLSv1_1_client_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_1_cli - 1] = TLSv1_1_client_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1604:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_1_client_method(void)) /* TLSv1.1 */ ^ tls_init.c:383:2: warning: 'TLSv1_1_server_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_1_srv - 1] = TLSv1_1_server_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1603:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_1_server_method(void)) /* TLSv1.1 */ ^ tls_init.c:384:2: warning: 'TLSv1_1_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_1 - 1] = TLSv1_1_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1602:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_1_method(void)) /* TLSv1.1 */ ^ tls_init.c:388:2: warning: 'TLSv1_2_client_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_2_cli - 1] = TLSv1_2_client_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1610:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_client_method(void)) /* TLSv1.2 */ ^ tls_init.c:389:2: warning: 'TLSv1_2_server_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_2_srv - 1] = TLSv1_2_server_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1609:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_server_method(void)) /* TLSv1.2 */ ^ tls_init.c:390:2: warning: 'TLSv1_2_method' is deprecated [-Wdeprecated-declarations] ssl_methods[TLS_USE_TLSv1_2 - 1] = TLSv1_2_method(); ^~~~~~~~~~~ In file included from /usr/include/openssl/ct.h:13:0, from /usr/include/openssl/ssl.h:61, from tls_init.c:45: /usr/include/openssl/ssl.h:1608:1: note: declared here DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_method(void)) /* TLSv1.2 */ ^