TLS backend OpenSSL: Use function-static variable for symbol loading

Replace a combination of a mutex, atomic variable, and another variable
by a function-local variable initialized by lambda.

C++17 standard guarantees that the lambda is called only once and
that any other callers will waiting for initialization to complete.

Task-number: QTBUG-103559
Change-Id: If9af8584e648ddb9ec518498ce035105e52413a2
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 331 insertions, 343 deletions

diff --git a/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp b/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp
index 899a6c4819..3b9c0dc889 100644
--- a/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp
+++ b/src/plugins/tls/openssl/qsslsocket_openssl_symbols.cpp
@@ -28,7 +28,6 @@
 #elif QT_CONFIG(library)
 # include <QtCore/qlibrary.h>
 #endif
-#include <QtCore/qmutex.h>
 #include <QtCore/qdatetime.h>
 #if defined(Q_OS_UNIX)
 #include <QtCore/qdir.h>
@@ -832,412 +831,401 @@ static LoadedOpenSsl loadOpenSsl()
 }
 #endif
 
-Q_CONSTINIT static QBasicMutex symbolResolveMutex;
-Q_CONSTINIT static QBasicAtomicInt symbolsResolved = Q_BASIC_ATOMIC_INITIALIZER(false);
-Q_CONSTINIT static bool triedToResolveSymbols = false;
-
 bool q_resolveOpenSslSymbols()
 {
-    if (symbolsResolved.loadAcquire())
-        return true;
-    QMutexLocker locker(&symbolResolveMutex);
-    if (symbolsResolved.loadRelaxed())
-        return true;
-    if (triedToResolveSymbols)
-        return false;
-    triedToResolveSymbols = true;
-
-    LoadedOpenSsl libs = loadOpenSsl();
-    if (!libs.ssl || !libs.crypto) {
-        qCWarning(lcTlsBackend, "Failed to load libssl/libcrypto.");
-        return false;
-    }
+    static bool symbolsResolved = []() {
+        LoadedOpenSsl libs = loadOpenSsl();
+        if (!libs.ssl || !libs.crypto) {
+            qCWarning(lcTlsBackend, "Failed to load libssl/libcrypto.");
+            return false;
+        }
 
-    RESOLVEFUNC(OPENSSL_init_ssl)
-    RESOLVEFUNC(OPENSSL_init_crypto)
-    RESOLVEFUNC(ASN1_STRING_get0_data)
-    RESOLVEFUNC(EVP_CIPHER_CTX_reset)
-    RESOLVEFUNC(AUTHORITY_INFO_ACCESS_free)
-    RESOLVEFUNC(EVP_PKEY_up_ref)
-    RESOLVEFUNC(EVP_PKEY_CTX_new)
-    RESOLVEFUNC(EVP_PKEY_param_check)
-    RESOLVEFUNC(EVP_PKEY_CTX_free)
-    RESOLVEFUNC(OPENSSL_sk_new_null)
-    RESOLVEFUNC(OPENSSL_sk_push)
-    RESOLVEFUNC(OPENSSL_sk_free)
-    RESOLVEFUNC(OPENSSL_sk_num)
-    RESOLVEFUNC(OPENSSL_sk_pop_free)
-    RESOLVEFUNC(OPENSSL_sk_value)
-    RESOLVEFUNC(DH_get0_pqg)
-    RESOLVEFUNC(SSL_CTX_set_options)
-    RESOLVEFUNC(SSL_set_info_callback)
-    RESOLVEFUNC(SSL_alert_type_string)
-    RESOLVEFUNC(SSL_alert_desc_string_long)
-    RESOLVEFUNC(SSL_CTX_get_security_level)
-    RESOLVEFUNC(SSL_CTX_set_security_level)
+        RESOLVEFUNC(OPENSSL_init_ssl)
+        RESOLVEFUNC(OPENSSL_init_crypto)
+        RESOLVEFUNC(ASN1_STRING_get0_data)
+        RESOLVEFUNC(EVP_CIPHER_CTX_reset)
+        RESOLVEFUNC(AUTHORITY_INFO_ACCESS_free)
+        RESOLVEFUNC(EVP_PKEY_up_ref)
+        RESOLVEFUNC(EVP_PKEY_CTX_new)
+        RESOLVEFUNC(EVP_PKEY_param_check)
+        RESOLVEFUNC(EVP_PKEY_CTX_free)
+        RESOLVEFUNC(OPENSSL_sk_new_null)
+        RESOLVEFUNC(OPENSSL_sk_push)
+        RESOLVEFUNC(OPENSSL_sk_free)
+        RESOLVEFUNC(OPENSSL_sk_num)
+        RESOLVEFUNC(OPENSSL_sk_pop_free)
+        RESOLVEFUNC(OPENSSL_sk_value)
+        RESOLVEFUNC(DH_get0_pqg)
+        RESOLVEFUNC(SSL_CTX_set_options)
+        RESOLVEFUNC(SSL_set_info_callback)
+        RESOLVEFUNC(SSL_alert_type_string)
+        RESOLVEFUNC(SSL_alert_desc_string_long)
+        RESOLVEFUNC(SSL_CTX_get_security_level)
+        RESOLVEFUNC(SSL_CTX_set_security_level)
 #ifdef TLS1_3_VERSION
-    RESOLVEFUNC(SSL_CTX_set_ciphersuites)
-    RESOLVEFUNC(SSL_set_psk_use_session_callback)
-    RESOLVEFUNC(SSL_CTX_sess_set_new_cb)
-    RESOLVEFUNC(SSL_SESSION_is_resumable)
+        RESOLVEFUNC(SSL_CTX_set_ciphersuites)
+        RESOLVEFUNC(SSL_set_psk_use_session_callback)
+        RESOLVEFUNC(SSL_CTX_sess_set_new_cb)
+        RESOLVEFUNC(SSL_SESSION_is_resumable)
 #endif // TLS 1.3 or OpenSSL > 1.1.1
 
-    RESOLVEFUNC(SSL_get_client_random)
-    RESOLVEFUNC(SSL_SESSION_get_master_key)
-    RESOLVEFUNC(SSL_session_reused)
-    RESOLVEFUNC(SSL_get_session)
-    RESOLVEFUNC(SSL_set_options)
-    RESOLVEFUNC(CRYPTO_get_ex_new_index)
-    RESOLVEFUNC(TLS_method)
-    RESOLVEFUNC(TLS_client_method)
-    RESOLVEFUNC(TLS_server_method)
-    RESOLVEFUNC(X509_up_ref)
-    RESOLVEFUNC(X509_STORE_CTX_get0_chain)
-    RESOLVEFUNC(X509_getm_notBefore)
-    RESOLVEFUNC(X509_getm_notAfter)
-    RESOLVEFUNC(ASN1_item_free)
-    RESOLVEFUNC(X509V3_conf_free)
-    RESOLVEFUNC(X509_get_version)
-    RESOLVEFUNC(X509_get_pubkey)
-    RESOLVEFUNC(X509_STORE_set_verify_cb)
-    RESOLVEFUNC(X509_STORE_set_ex_data)
-    RESOLVEFUNC(X509_STORE_get_ex_data)
-    RESOLVEFUNC(CRYPTO_free)
-    RESOLVEFUNC(OpenSSL_version_num)
-    RESOLVEFUNC(OpenSSL_version)
-
-    if (!_q_OpenSSL_version || !_q_OpenSSL_version_num) {
-        // Apparently, we were built with OpenSSL 1.1 enabled but are now using
-        // a wrong library.
-        qCWarning(lcTlsBackend, "Incompatible version of OpenSSL");
-        return false;
-    }
+        RESOLVEFUNC(SSL_get_client_random)
+        RESOLVEFUNC(SSL_SESSION_get_master_key)
+        RESOLVEFUNC(SSL_session_reused)
+        RESOLVEFUNC(SSL_get_session)
+        RESOLVEFUNC(SSL_set_options)
+        RESOLVEFUNC(CRYPTO_get_ex_new_index)
+        RESOLVEFUNC(TLS_method)
+        RESOLVEFUNC(TLS_client_method)
+        RESOLVEFUNC(TLS_server_method)
+        RESOLVEFUNC(X509_up_ref)
+        RESOLVEFUNC(X509_STORE_CTX_get0_chain)
+        RESOLVEFUNC(X509_getm_notBefore)
+        RESOLVEFUNC(X509_getm_notAfter)
+        RESOLVEFUNC(ASN1_item_free)
+        RESOLVEFUNC(X509V3_conf_free)
+        RESOLVEFUNC(X509_get_version)
+        RESOLVEFUNC(X509_get_pubkey)
+        RESOLVEFUNC(X509_STORE_set_verify_cb)
+        RESOLVEFUNC(X509_STORE_set_ex_data)
+        RESOLVEFUNC(X509_STORE_get_ex_data)
+        RESOLVEFUNC(CRYPTO_free)
+        RESOLVEFUNC(OpenSSL_version_num)
+        RESOLVEFUNC(OpenSSL_version)
+
+        if (!_q_OpenSSL_version || !_q_OpenSSL_version_num) {
+            // Apparently, we were built with OpenSSL 1.1 enabled but are now using
+            // a wrong library.
+            qCWarning(lcTlsBackend, "Incompatible version of OpenSSL");
+            return false;
+        }
 
 #if OPENSSL_VERSION_NUMBER >= 0x30000000
-    if (q_OpenSSL_version_num() < 0x30000000) {
-        qCWarning(lcTlsBackend, "Incompatible version of OpenSSL (built with OpenSSL >= 3.x, runtime version is < 3.x)");
-        return false;
-    }
+        if (q_OpenSSL_version_num() < 0x30000000) {
+            qCWarning(lcTlsBackend, "Incompatible version of OpenSSL (built with OpenSSL >= 3.x, runtime version is < 3.x)");
+            return false;
+        }
 #else
-    if (q_OpenSSL_version_num() >= 0x30000000) {
-        qCWarning(lcTlsBackend, "Incompatible version of OpenSSL (built with OpenSSL 1.x, runtime version is >= 3.x)");
-        return false;
-    }
+        if (q_OpenSSL_version_num() >= 0x30000000) {
+            qCWarning(lcTlsBackend, "Incompatible version of OpenSSL (built with OpenSSL 1.x, runtime version is >= 3.x)");
+            return false;
+        }
 #endif // OPENSSL_VERSION_NUMBER
 
-    RESOLVEFUNC(SSL_SESSION_get_ticket_lifetime_hint)
+        RESOLVEFUNC(SSL_SESSION_get_ticket_lifetime_hint)
 
 #if QT_CONFIG(dtls)
-    RESOLVEFUNC(DTLSv1_listen)
-    RESOLVEFUNC(BIO_ADDR_new)
-    RESOLVEFUNC(BIO_ADDR_free)
-    RESOLVEFUNC(BIO_meth_new)
-    RESOLVEFUNC(BIO_meth_free)
-    RESOLVEFUNC(BIO_meth_set_write)
-    RESOLVEFUNC(BIO_meth_set_read)
-    RESOLVEFUNC(BIO_meth_set_puts)
-    RESOLVEFUNC(BIO_meth_set_ctrl)
-    RESOLVEFUNC(BIO_meth_set_create)
-    RESOLVEFUNC(BIO_meth_set_destroy)
+        RESOLVEFUNC(DTLSv1_listen)
+        RESOLVEFUNC(BIO_ADDR_new)
+        RESOLVEFUNC(BIO_ADDR_free)
+        RESOLVEFUNC(BIO_meth_new)
+        RESOLVEFUNC(BIO_meth_free)
+        RESOLVEFUNC(BIO_meth_set_write)
+        RESOLVEFUNC(BIO_meth_set_read)
+        RESOLVEFUNC(BIO_meth_set_puts)
+        RESOLVEFUNC(BIO_meth_set_ctrl)
+        RESOLVEFUNC(BIO_meth_set_create)
+        RESOLVEFUNC(BIO_meth_set_destroy)
 #endif // dtls
 
 #if QT_CONFIG(ocsp)
-    RESOLVEFUNC(OCSP_SINGLERESP_get0_id)
-    RESOLVEFUNC(d2i_OCSP_RESPONSE)
-    RESOLVEFUNC(OCSP_RESPONSE_free)
-    RESOLVEFUNC(OCSP_response_status)
-    RESOLVEFUNC(OCSP_response_get1_basic)
-    RESOLVEFUNC(OCSP_BASICRESP_free)
-    RESOLVEFUNC(OCSP_basic_verify)
-    RESOLVEFUNC(OCSP_resp_count)
-    RESOLVEFUNC(OCSP_resp_get0)
-    RESOLVEFUNC(OCSP_single_get0_status)
-    RESOLVEFUNC(OCSP_check_validity)
-    RESOLVEFUNC(OCSP_cert_to_id)
-    RESOLVEFUNC(OCSP_id_get0_info)
-    RESOLVEFUNC(OCSP_resp_get0_certs)
-    RESOLVEFUNC(OCSP_basic_sign)
-    RESOLVEFUNC(OCSP_response_create)
-    RESOLVEFUNC(i2d_OCSP_RESPONSE)
-    RESOLVEFUNC(OCSP_basic_add1_status)
-    RESOLVEFUNC(OCSP_BASICRESP_new)
-    RESOLVEFUNC(OCSP_CERTID_free)
-    RESOLVEFUNC(OCSP_cert_to_id)
-    RESOLVEFUNC(OCSP_id_cmp)
+        RESOLVEFUNC(OCSP_SINGLERESP_get0_id)
+        RESOLVEFUNC(d2i_OCSP_RESPONSE)
+        RESOLVEFUNC(OCSP_RESPONSE_free)
+        RESOLVEFUNC(OCSP_response_status)
+        RESOLVEFUNC(OCSP_response_get1_basic)
+        RESOLVEFUNC(OCSP_BASICRESP_free)
+        RESOLVEFUNC(OCSP_basic_verify)
+        RESOLVEFUNC(OCSP_resp_count)
+        RESOLVEFUNC(OCSP_resp_get0)
+        RESOLVEFUNC(OCSP_single_get0_status)
+        RESOLVEFUNC(OCSP_check_validity)
+        RESOLVEFUNC(OCSP_cert_to_id)
+        RESOLVEFUNC(OCSP_id_get0_info)
+        RESOLVEFUNC(OCSP_resp_get0_certs)
+        RESOLVEFUNC(OCSP_basic_sign)
+        RESOLVEFUNC(OCSP_response_create)
+        RESOLVEFUNC(i2d_OCSP_RESPONSE)
+        RESOLVEFUNC(OCSP_basic_add1_status)
+        RESOLVEFUNC(OCSP_BASICRESP_new)
+        RESOLVEFUNC(OCSP_CERTID_free)
+        RESOLVEFUNC(OCSP_cert_to_id)
+        RESOLVEFUNC(OCSP_id_cmp)
 #endif // ocsp
 
-    RESOLVEFUNC(BIO_set_data)
-    RESOLVEFUNC(BIO_get_data)
-    RESOLVEFUNC(BIO_set_init)
-    RESOLVEFUNC(BIO_get_shutdown)
-    RESOLVEFUNC(BIO_set_shutdown)
-    RESOLVEFUNC(ASN1_INTEGER_get)
-    RESOLVEFUNC(ASN1_INTEGER_cmp)
-    RESOLVEFUNC(ASN1_STRING_length)
-    RESOLVEFUNC(ASN1_STRING_to_UTF8)
-    RESOLVEFUNC(ASN1_TIME_to_tm)
-    RESOLVEFUNC(BIO_ctrl)
-    RESOLVEFUNC(BIO_free)
-    RESOLVEFUNC(BIO_new)
-    RESOLVEFUNC(BIO_new_mem_buf)
-    RESOLVEFUNC(BIO_read)
-    RESOLVEFUNC(BIO_s_mem)
-    RESOLVEFUNC(BIO_write)
-    RESOLVEFUNC(BIO_set_flags)
-    RESOLVEFUNC(BIO_clear_flags)
-    RESOLVEFUNC(BIO_set_ex_data)
-    RESOLVEFUNC(BIO_get_ex_data)
-    RESOLVEFUNC(BN_num_bits)
-    RESOLVEFUNC(BN_is_word)
-    RESOLVEFUNC(BN_mod_word)
-    RESOLVEFUNC(ERR_error_string)
-    RESOLVEFUNC(ERR_error_string_n)
-    RESOLVEFUNC(ERR_get_error)
-    RESOLVEFUNC(EVP_CIPHER_CTX_new)
-    RESOLVEFUNC(EVP_CIPHER_CTX_free)
-    RESOLVEFUNC(EVP_CIPHER_CTX_ctrl)
-    RESOLVEFUNC(EVP_CIPHER_CTX_set_key_length)
-    RESOLVEFUNC(EVP_CipherInit)
-    RESOLVEFUNC(EVP_CipherInit_ex)
-    RESOLVEFUNC(EVP_CipherUpdate)
-    RESOLVEFUNC(EVP_CipherFinal)
-    RESOLVEFUNC(EVP_get_digestbyname)
+        RESOLVEFUNC(BIO_set_data)
+        RESOLVEFUNC(BIO_get_data)
+        RESOLVEFUNC(BIO_set_init)
+        RESOLVEFUNC(BIO_get_shutdown)
+        RESOLVEFUNC(BIO_set_shutdown)
+        RESOLVEFUNC(ASN1_INTEGER_get)
+        RESOLVEFUNC(ASN1_INTEGER_cmp)
+        RESOLVEFUNC(ASN1_STRING_length)
+        RESOLVEFUNC(ASN1_STRING_to_UTF8)
+        RESOLVEFUNC(ASN1_TIME_to_tm)
+        RESOLVEFUNC(BIO_ctrl)
+        RESOLVEFUNC(BIO_free)
+        RESOLVEFUNC(BIO_new)
+        RESOLVEFUNC(BIO_new_mem_buf)
+        RESOLVEFUNC(BIO_read)
+        RESOLVEFUNC(BIO_s_mem)
+        RESOLVEFUNC(BIO_write)
+        RESOLVEFUNC(BIO_set_flags)
+        RESOLVEFUNC(BIO_clear_flags)
+        RESOLVEFUNC(BIO_set_ex_data)
+        RESOLVEFUNC(BIO_get_ex_data)
+        RESOLVEFUNC(BN_num_bits)
+        RESOLVEFUNC(BN_is_word)
+        RESOLVEFUNC(BN_mod_word)
+        RESOLVEFUNC(ERR_error_string)
+        RESOLVEFUNC(ERR_error_string_n)
+        RESOLVEFUNC(ERR_get_error)
+        RESOLVEFUNC(EVP_CIPHER_CTX_new)
+        RESOLVEFUNC(EVP_CIPHER_CTX_free)
+        RESOLVEFUNC(EVP_CIPHER_CTX_ctrl)
+        RESOLVEFUNC(EVP_CIPHER_CTX_set_key_length)
+        RESOLVEFUNC(EVP_CipherInit)
+        RESOLVEFUNC(EVP_CipherInit_ex)
+        RESOLVEFUNC(EVP_CipherUpdate)
+        RESOLVEFUNC(EVP_CipherFinal)
+        RESOLVEFUNC(EVP_get_digestbyname)
 #ifndef OPENSSL_NO_DES
-    RESOLVEFUNC(EVP_des_cbc)
-    RESOLVEFUNC(EVP_des_ede3_cbc)
+        RESOLVEFUNC(EVP_des_cbc)
+        RESOLVEFUNC(EVP_des_ede3_cbc)
 #endif
 #ifndef OPENSSL_NO_RC2
-    RESOLVEFUNC(EVP_rc2_cbc)
+        RESOLVEFUNC(EVP_rc2_cbc)
 #endif
 #ifndef OPENSSL_NO_AES
-    RESOLVEFUNC(EVP_aes_128_cbc)
-    RESOLVEFUNC(EVP_aes_192_cbc)
-    RESOLVEFUNC(EVP_aes_256_cbc)
+        RESOLVEFUNC(EVP_aes_128_cbc)
+        RESOLVEFUNC(EVP_aes_192_cbc)
+        RESOLVEFUNC(EVP_aes_256_cbc)
 #endif
-    RESOLVEFUNC(EVP_sha1)
-    RESOLVEFUNC(EVP_PKEY_free)
-    RESOLVEFUNC(EVP_PKEY_new)
-    RESOLVEFUNC(EVP_PKEY_type)
-    RESOLVEFUNC(OBJ_nid2sn)
-    RESOLVEFUNC(OBJ_nid2ln)
-    RESOLVEFUNC(OBJ_sn2nid)
-    RESOLVEFUNC(OBJ_ln2nid)
-    RESOLVEFUNC(i2t_ASN1_OBJECT)
-    RESOLVEFUNC(OBJ_obj2txt)
-    RESOLVEFUNC(OBJ_obj2nid)
-    RESOLVEFUNC(PEM_read_bio_PrivateKey)
-    RESOLVEFUNC(PEM_read_bio_DHparams)
-    RESOLVEFUNC(PEM_write_bio_PrivateKey)
-    RESOLVEFUNC(PEM_write_bio_PrivateKey_traditional)
-    RESOLVEFUNC(PEM_read_bio_PUBKEY)
-    RESOLVEFUNC(PEM_write_bio_PUBKEY)
-    RESOLVEFUNC(RAND_seed)
-    RESOLVEFUNC(RAND_status)
-    RESOLVEFUNC(RAND_bytes)
-    RESOLVEFUNC(SSL_CIPHER_description)
-    RESOLVEFUNC(SSL_CIPHER_get_bits)
-    RESOLVEFUNC(SSL_get_rbio)
-    RESOLVEFUNC(SSL_CTX_check_private_key)
-    RESOLVEFUNC(SSL_CTX_ctrl)
-    RESOLVEFUNC(SSL_CTX_free)
-    RESOLVEFUNC(SSL_CTX_new)
-    RESOLVEFUNC(SSL_CTX_set_cipher_list)
-    RESOLVEFUNC(SSL_CTX_callback_ctrl)
-    RESOLVEFUNC(SSL_CTX_set_default_verify_paths)
-    RESOLVEFUNC(SSL_CTX_set_verify)
-    RESOLVEFUNC(SSL_CTX_set_verify_depth)
-    RESOLVEFUNC(SSL_CTX_use_certificate)
-    RESOLVEFUNC(SSL_CTX_use_certificate_file)
-    RESOLVEFUNC(SSL_CTX_use_PrivateKey)
-    RESOLVEFUNC(SSL_CTX_use_PrivateKey_file)
-    RESOLVEFUNC(SSL_CTX_get_cert_store);
-    RESOLVEFUNC(SSL_CONF_CTX_new);
-    RESOLVEFUNC(SSL_CONF_CTX_free);
-    RESOLVEFUNC(SSL_CONF_CTX_set_ssl_ctx);
-    RESOLVEFUNC(SSL_CONF_CTX_set_flags);
-    RESOLVEFUNC(SSL_CONF_CTX_finish);
-    RESOLVEFUNC(SSL_CONF_cmd);
-    RESOLVEFUNC(SSL_accept)
-    RESOLVEFUNC(SSL_clear)
-    RESOLVEFUNC(SSL_connect)
-    RESOLVEFUNC(SSL_free)
-    RESOLVEFUNC(SSL_get_ciphers)
-    RESOLVEFUNC(SSL_get_current_cipher)
-    RESOLVEFUNC(SSL_version)
-    RESOLVEFUNC(SSL_get_error)
-    RESOLVEFUNC(SSL_get_peer_cert_chain)
+        RESOLVEFUNC(EVP_sha1)
+        RESOLVEFUNC(EVP_PKEY_free)
+        RESOLVEFUNC(EVP_PKEY_new)
+        RESOLVEFUNC(EVP_PKEY_type)
+        RESOLVEFUNC(OBJ_nid2sn)
+        RESOLVEFUNC(OBJ_nid2ln)
+        RESOLVEFUNC(OBJ_sn2nid)
+        RESOLVEFUNC(OBJ_ln2nid)
+        RESOLVEFUNC(i2t_ASN1_OBJECT)
+        RESOLVEFUNC(OBJ_obj2txt)
+        RESOLVEFUNC(OBJ_obj2nid)
+        RESOLVEFUNC(PEM_read_bio_PrivateKey)
+        RESOLVEFUNC(PEM_read_bio_DHparams)
+        RESOLVEFUNC(PEM_write_bio_PrivateKey)
+        RESOLVEFUNC(PEM_write_bio_PrivateKey_traditional)
+        RESOLVEFUNC(PEM_read_bio_PUBKEY)
+        RESOLVEFUNC(PEM_write_bio_PUBKEY)
+        RESOLVEFUNC(RAND_seed)
+        RESOLVEFUNC(RAND_status)
+        RESOLVEFUNC(RAND_bytes)
+        RESOLVEFUNC(SSL_CIPHER_description)
+        RESOLVEFUNC(SSL_CIPHER_get_bits)
+        RESOLVEFUNC(SSL_get_rbio)
+        RESOLVEFUNC(SSL_CTX_check_private_key)
+        RESOLVEFUNC(SSL_CTX_ctrl)
+        RESOLVEFUNC(SSL_CTX_free)
+        RESOLVEFUNC(SSL_CTX_new)
+        RESOLVEFUNC(SSL_CTX_set_cipher_list)
+        RESOLVEFUNC(SSL_CTX_callback_ctrl)
+        RESOLVEFUNC(SSL_CTX_set_default_verify_paths)
+        RESOLVEFUNC(SSL_CTX_set_verify)
+        RESOLVEFUNC(SSL_CTX_set_verify_depth)
+        RESOLVEFUNC(SSL_CTX_use_certificate)
+        RESOLVEFUNC(SSL_CTX_use_certificate_file)
+        RESOLVEFUNC(SSL_CTX_use_PrivateKey)
+        RESOLVEFUNC(SSL_CTX_use_PrivateKey_file)
+        RESOLVEFUNC(SSL_CTX_get_cert_store);
+        RESOLVEFUNC(SSL_CONF_CTX_new);
+        RESOLVEFUNC(SSL_CONF_CTX_free);
+        RESOLVEFUNC(SSL_CONF_CTX_set_ssl_ctx);
+        RESOLVEFUNC(SSL_CONF_CTX_set_flags);
+        RESOLVEFUNC(SSL_CONF_CTX_finish);
+        RESOLVEFUNC(SSL_CONF_cmd);
+        RESOLVEFUNC(SSL_accept)
+        RESOLVEFUNC(SSL_clear)
+        RESOLVEFUNC(SSL_connect)
+        RESOLVEFUNC(SSL_free)
+        RESOLVEFUNC(SSL_get_ciphers)
+        RESOLVEFUNC(SSL_get_current_cipher)
+        RESOLVEFUNC(SSL_version)
+        RESOLVEFUNC(SSL_get_error)
+        RESOLVEFUNC(SSL_get_peer_cert_chain)
 
 #if defined(OPENSSL_VERSION_MAJOR) && OPENSSL_VERSION_MAJOR >= 3
-    RESOLVEFUNC(SSL_get1_peer_certificate)
-    RESOLVEFUNC(EVP_PKEY_get_bits)
-    RESOLVEFUNC(EVP_PKEY_get_base_id)
+        RESOLVEFUNC(SSL_get1_peer_certificate)
+        RESOLVEFUNC(EVP_PKEY_get_bits)
+        RESOLVEFUNC(EVP_PKEY_get_base_id)
 #else
-    RESOLVEFUNC(SSL_get_peer_certificate)
-    RESOLVEFUNC(EVP_PKEY_base_id)
+        RESOLVEFUNC(SSL_get_peer_certificate)
+        RESOLVEFUNC(EVP_PKEY_base_id)
 #endif // OPENSSL_VERSION_MAJOR >= 3
 
 #ifndef OPENSSL_NO_DEPRECATED_3_0
-    RESOLVEFUNC(EVP_PKEY_assign)
-    RESOLVEFUNC(EVP_PKEY_cmp)
+        RESOLVEFUNC(EVP_PKEY_assign)
+        RESOLVEFUNC(EVP_PKEY_cmp)
 
-    RESOLVEFUNC(EVP_PKEY_set1_RSA)
-    RESOLVEFUNC(EVP_PKEY_set1_DSA)
-    RESOLVEFUNC(EVP_PKEY_set1_DH)
+        RESOLVEFUNC(EVP_PKEY_set1_RSA)
+        RESOLVEFUNC(EVP_PKEY_set1_DSA)
+        RESOLVEFUNC(EVP_PKEY_set1_DH)
 
-    RESOLVEFUNC(EVP_PKEY_get1_DSA)
-    RESOLVEFUNC(EVP_PKEY_get1_RSA)
-    RESOLVEFUNC(EVP_PKEY_get1_DH)
+        RESOLVEFUNC(EVP_PKEY_get1_DSA)
+        RESOLVEFUNC(EVP_PKEY_get1_RSA)
+        RESOLVEFUNC(EVP_PKEY_get1_DH)
 
-    RESOLVEFUNC(PEM_read_bio_DSA_PUBKEY)
-    RESOLVEFUNC(PEM_read_bio_RSA_PUBKEY)
-    RESOLVEFUNC(PEM_read_bio_DSAPrivateKey)
-    RESOLVEFUNC(PEM_read_bio_RSAPrivateKey)
+        RESOLVEFUNC(PEM_read_bio_DSA_PUBKEY)
+        RESOLVEFUNC(PEM_read_bio_RSA_PUBKEY)
+        RESOLVEFUNC(PEM_read_bio_DSAPrivateKey)
+        RESOLVEFUNC(PEM_read_bio_RSAPrivateKey)
 
-    RESOLVEFUNC(PEM_write_bio_DSA_PUBKEY)
-    RESOLVEFUNC(PEM_write_bio_RSA_PUBKEY)
-    RESOLVEFUNC(PEM_write_bio_DSAPrivateKey)
-    RESOLVEFUNC(PEM_write_bio_RSAPrivateKey)
-    RESOLVEFUNC(SSL_CTX_use_RSAPrivateKey)
+        RESOLVEFUNC(PEM_write_bio_DSA_PUBKEY)
+        RESOLVEFUNC(PEM_write_bio_RSA_PUBKEY)
+        RESOLVEFUNC(PEM_write_bio_DSAPrivateKey)
+        RESOLVEFUNC(PEM_write_bio_RSAPrivateKey)
+        RESOLVEFUNC(SSL_CTX_use_RSAPrivateKey)
 
-    RESOLVEFUNC(DSA_new)
-    RESOLVEFUNC(DSA_free)
+        RESOLVEFUNC(DSA_new)
+        RESOLVEFUNC(DSA_free)
 
-    RESOLVEFUNC(RSA_new)
-    RESOLVEFUNC(RSA_free)
+        RESOLVEFUNC(RSA_new)
+        RESOLVEFUNC(RSA_free)
 
-    RESOLVEFUNC(DH_bits)
-    RESOLVEFUNC(DSA_bits)
-    RESOLVEFUNC(RSA_bits)
+        RESOLVEFUNC(DH_bits)
+        RESOLVEFUNC(DSA_bits)
+        RESOLVEFUNC(RSA_bits)
 
 #ifndef OPENSSL_NO_EC
 
-    RESOLVEFUNC(EVP_PKEY_set1_EC_KEY)
-    RESOLVEFUNC(EVP_PKEY_get1_EC_KEY)
-    RESOLVEFUNC(PEM_read_bio_EC_PUBKEY)
-    RESOLVEFUNC(PEM_read_bio_ECPrivateKey)
-    RESOLVEFUNC(PEM_write_bio_EC_PUBKEY)
-    RESOLVEFUNC(PEM_write_bio_ECPrivateKey)
-    RESOLVEFUNC(EC_KEY_get0_group)
-    RESOLVEFUNC(EC_GROUP_get_degree)
-    RESOLVEFUNC(EC_KEY_dup)
-    RESOLVEFUNC(EC_KEY_new_by_curve_name)
-    RESOLVEFUNC(EC_KEY_free)
+        RESOLVEFUNC(EVP_PKEY_set1_EC_KEY)
+        RESOLVEFUNC(EVP_PKEY_get1_EC_KEY)
+        RESOLVEFUNC(PEM_read_bio_EC_PUBKEY)
+        RESOLVEFUNC(PEM_read_bio_ECPrivateKey)
+        RESOLVEFUNC(PEM_write_bio_EC_PUBKEY)
+        RESOLVEFUNC(PEM_write_bio_ECPrivateKey)
+        RESOLVEFUNC(EC_KEY_get0_group)
+        RESOLVEFUNC(EC_GROUP_get_degree)
+        RESOLVEFUNC(EC_KEY_dup)
+        RESOLVEFUNC(EC_KEY_new_by_curve_name)
+        RESOLVEFUNC(EC_KEY_free)
 
 #endif // OPENSSL_NO_EC
 
 #endif // OPENSSL_NO_DEPRECATED_3_0
 
-    RESOLVEFUNC(SSL_get_verify_result)
-    RESOLVEFUNC(SSL_new)
-    RESOLVEFUNC(SSL_get_SSL_CTX)
-    RESOLVEFUNC(SSL_ctrl)
-    RESOLVEFUNC(SSL_read)
-    RESOLVEFUNC(SSL_set_accept_state)
-    RESOLVEFUNC(SSL_set_bio)
-    RESOLVEFUNC(SSL_set_connect_state)
-    RESOLVEFUNC(SSL_shutdown)
-    RESOLVEFUNC(SSL_in_init)
-    RESOLVEFUNC(SSL_get_shutdown)
-    RESOLVEFUNC(SSL_set_session)
-    RESOLVEFUNC(SSL_SESSION_free)
-    RESOLVEFUNC(SSL_get1_session)
-    RESOLVEFUNC(SSL_get_session)
-    RESOLVEFUNC(SSL_set_ex_data)
-    RESOLVEFUNC(SSL_get_ex_data)
-    RESOLVEFUNC(SSL_get_ex_data_X509_STORE_CTX_idx)
+        RESOLVEFUNC(SSL_get_verify_result)
+        RESOLVEFUNC(SSL_new)
+        RESOLVEFUNC(SSL_get_SSL_CTX)
+        RESOLVEFUNC(SSL_ctrl)
+        RESOLVEFUNC(SSL_read)
+        RESOLVEFUNC(SSL_set_accept_state)
+        RESOLVEFUNC(SSL_set_bio)
+        RESOLVEFUNC(SSL_set_connect_state)
+        RESOLVEFUNC(SSL_shutdown)
+        RESOLVEFUNC(SSL_in_init)
+        RESOLVEFUNC(SSL_get_shutdown)
+        RESOLVEFUNC(SSL_set_session)
+        RESOLVEFUNC(SSL_SESSION_free)
+        RESOLVEFUNC(SSL_get1_session)
+        RESOLVEFUNC(SSL_get_session)
+        RESOLVEFUNC(SSL_set_ex_data)
+        RESOLVEFUNC(SSL_get_ex_data)
+        RESOLVEFUNC(SSL_get_ex_data_X509_STORE_CTX_idx)
 
 #ifndef OPENSSL_NO_PSK
-    RESOLVEFUNC(SSL_set_psk_client_callback)
-    RESOLVEFUNC(SSL_set_psk_server_callback)
-    RESOLVEFUNC(SSL_CTX_use_psk_identity_hint)
+        RESOLVEFUNC(SSL_set_psk_client_callback)
+        RESOLVEFUNC(SSL_set_psk_server_callback)
+        RESOLVEFUNC(SSL_CTX_use_psk_identity_hint)
 #endif // !OPENSSL_NO_PSK
 
-    RESOLVEFUNC(SSL_write)
-    RESOLVEFUNC(X509_NAME_entry_count)
-    RESOLVEFUNC(X509_NAME_get_entry)
-    RESOLVEFUNC(X509_NAME_ENTRY_get_data)
-    RESOLVEFUNC(X509_NAME_ENTRY_get_object)
-    RESOLVEFUNC(X509_PUBKEY_get)
-    RESOLVEFUNC(X509_STORE_free)
-    RESOLVEFUNC(X509_STORE_new)
-    RESOLVEFUNC(X509_STORE_add_cert)
-    RESOLVEFUNC(X509_STORE_CTX_free)
-    RESOLVEFUNC(X509_STORE_CTX_init)
-    RESOLVEFUNC(X509_STORE_CTX_new)
-    RESOLVEFUNC(X509_STORE_CTX_set_purpose)
-    RESOLVEFUNC(X509_STORE_CTX_get_error)
-    RESOLVEFUNC(X509_STORE_CTX_get_error_depth)
-    RESOLVEFUNC(X509_STORE_CTX_get_current_cert)
-    RESOLVEFUNC(X509_STORE_CTX_get0_store)
-    RESOLVEFUNC(X509_cmp)
-    RESOLVEFUNC(X509_STORE_CTX_get_ex_data)
-    RESOLVEFUNC(X509_dup)
-    RESOLVEFUNC(X509_print)
-    RESOLVEFUNC(X509_digest)
-    RESOLVEFUNC(X509_EXTENSION_get_object)
-    RESOLVEFUNC(X509_free)
-    RESOLVEFUNC(X509_gmtime_adj)
-    RESOLVEFUNC(ASN1_TIME_free)
-    RESOLVEFUNC(X509_get_ext)
-    RESOLVEFUNC(X509_get_ext_count)
-    RESOLVEFUNC(X509_get_ext_d2i)
-    RESOLVEFUNC(X509V3_EXT_get)
-    RESOLVEFUNC(X509V3_EXT_d2i)
-    RESOLVEFUNC(X509_EXTENSION_get_critical)
-    RESOLVEFUNC(X509_EXTENSION_get_data)
-    RESOLVEFUNC(BASIC_CONSTRAINTS_free)
-    RESOLVEFUNC(AUTHORITY_KEYID_free)
-    RESOLVEFUNC(GENERAL_NAME_free)
-    RESOLVEFUNC(ASN1_STRING_print)
-    RESOLVEFUNC(X509_check_issued)
-    RESOLVEFUNC(X509_get_issuer_name)
-    RESOLVEFUNC(X509_get_subject_name)
-    RESOLVEFUNC(X509_get_serialNumber)
-    RESOLVEFUNC(X509_verify_cert)
-    RESOLVEFUNC(d2i_X509)
-    RESOLVEFUNC(i2d_X509)
+        RESOLVEFUNC(SSL_write)
+        RESOLVEFUNC(X509_NAME_entry_count)
+        RESOLVEFUNC(X509_NAME_get_entry)
+        RESOLVEFUNC(X509_NAME_ENTRY_get_data)
+        RESOLVEFUNC(X509_NAME_ENTRY_get_object)
+        RESOLVEFUNC(X509_PUBKEY_get)
+        RESOLVEFUNC(X509_STORE_free)
+        RESOLVEFUNC(X509_STORE_new)
+        RESOLVEFUNC(X509_STORE_add_cert)
+        RESOLVEFUNC(X509_STORE_CTX_free)
+        RESOLVEFUNC(X509_STORE_CTX_init)
+        RESOLVEFUNC(X509_STORE_CTX_new)
+        RESOLVEFUNC(X509_STORE_CTX_set_purpose)
+        RESOLVEFUNC(X509_STORE_CTX_get_error)
+        RESOLVEFUNC(X509_STORE_CTX_get_error_depth)
+        RESOLVEFUNC(X509_STORE_CTX_get_current_cert)
+        RESOLVEFUNC(X509_STORE_CTX_get0_store)
+        RESOLVEFUNC(X509_cmp)
+        RESOLVEFUNC(X509_STORE_CTX_get_ex_data)
+        RESOLVEFUNC(X509_dup)
+        RESOLVEFUNC(X509_print)
+        RESOLVEFUNC(X509_digest)
+        RESOLVEFUNC(X509_EXTENSION_get_object)
+        RESOLVEFUNC(X509_free)
+        RESOLVEFUNC(X509_gmtime_adj)
+        RESOLVEFUNC(ASN1_TIME_free)
+        RESOLVEFUNC(X509_get_ext)
+        RESOLVEFUNC(X509_get_ext_count)
+        RESOLVEFUNC(X509_get_ext_d2i)
+        RESOLVEFUNC(X509V3_EXT_get)
+        RESOLVEFUNC(X509V3_EXT_d2i)
+        RESOLVEFUNC(X509_EXTENSION_get_critical)
+        RESOLVEFUNC(X509_EXTENSION_get_data)
+        RESOLVEFUNC(BASIC_CONSTRAINTS_free)
+        RESOLVEFUNC(AUTHORITY_KEYID_free)
+        RESOLVEFUNC(GENERAL_NAME_free)
+        RESOLVEFUNC(ASN1_STRING_print)
+        RESOLVEFUNC(X509_check_issued)
+        RESOLVEFUNC(X509_get_issuer_name)
+        RESOLVEFUNC(X509_get_subject_name)
+        RESOLVEFUNC(X509_get_serialNumber)
+        RESOLVEFUNC(X509_verify_cert)
+        RESOLVEFUNC(d2i_X509)
+        RESOLVEFUNC(i2d_X509)
 #if OPENSSL_VERSION_MAJOR < 3
-    RESOLVEFUNC(SSL_CTX_load_verify_locations)
+        RESOLVEFUNC(SSL_CTX_load_verify_locations)
 #else
-    RESOLVEFUNC(SSL_CTX_load_verify_dir)
+        RESOLVEFUNC(SSL_CTX_load_verify_dir)
 #endif // OPENSSL_VERSION_MAJOR
-    RESOLVEFUNC(i2d_SSL_SESSION)
-    RESOLVEFUNC(d2i_SSL_SESSION)
+        RESOLVEFUNC(i2d_SSL_SESSION)
+        RESOLVEFUNC(d2i_SSL_SESSION)
 
 #ifndef OPENSSL_NO_NEXTPROTONEG
-    RESOLVEFUNC(SSL_select_next_proto)
-    RESOLVEFUNC(SSL_CTX_set_next_proto_select_cb)
-    RESOLVEFUNC(SSL_get0_next_proto_negotiated)
-    RESOLVEFUNC(SSL_set_alpn_protos)
-    RESOLVEFUNC(SSL_CTX_set_alpn_select_cb)
-    RESOLVEFUNC(SSL_get0_alpn_selected)
+        RESOLVEFUNC(SSL_select_next_proto)
+        RESOLVEFUNC(SSL_CTX_set_next_proto_select_cb)
+        RESOLVEFUNC(SSL_get0_next_proto_negotiated)
+        RESOLVEFUNC(SSL_set_alpn_protos)
+        RESOLVEFUNC(SSL_CTX_set_alpn_select_cb)
+        RESOLVEFUNC(SSL_get0_alpn_selected)
 #endif // !OPENSSL_NO_NEXTPROTONEG
 
 #if QT_CONFIG(dtls)
-    RESOLVEFUNC(SSL_CTX_set_cookie_generate_cb)
-    RESOLVEFUNC(SSL_CTX_set_cookie_verify_cb)
-    RESOLVEFUNC(DTLS_server_method)
-    RESOLVEFUNC(DTLS_client_method)
+        RESOLVEFUNC(SSL_CTX_set_cookie_generate_cb)
+        RESOLVEFUNC(SSL_CTX_set_cookie_verify_cb)
+        RESOLVEFUNC(DTLS_server_method)
+        RESOLVEFUNC(DTLS_client_method)
 #endif // dtls
 
-    RESOLVEFUNC(CRYPTO_malloc)
-    RESOLVEFUNC(DH_new)
-    RESOLVEFUNC(DH_free)
-    RESOLVEFUNC(d2i_DHparams)
-    RESOLVEFUNC(i2d_DHparams)
-    RESOLVEFUNC(DH_check)
-    RESOLVEFUNC(BN_bin2bn)
+        RESOLVEFUNC(CRYPTO_malloc)
+        RESOLVEFUNC(DH_new)
+        RESOLVEFUNC(DH_free)
+        RESOLVEFUNC(d2i_DHparams)
+        RESOLVEFUNC(i2d_DHparams)
+        RESOLVEFUNC(DH_check)
+        RESOLVEFUNC(BN_bin2bn)
 
 #ifndef OPENSSL_NO_EC
-    RESOLVEFUNC(EC_get_builtin_curves)
+        RESOLVEFUNC(EC_get_builtin_curves)
 #endif // OPENSSL_NO_EC
 
-    RESOLVEFUNC(PKCS12_parse)
-    RESOLVEFUNC(d2i_PKCS12_bio)
-    RESOLVEFUNC(PKCS12_free)
+        RESOLVEFUNC(PKCS12_parse)
+        RESOLVEFUNC(d2i_PKCS12_bio)
+        RESOLVEFUNC(PKCS12_free)
+        return true;
+    }();
 
-    symbolsResolved.storeRelease(true);
-    return true;
+    return symbolsResolved;
 }
 #endif // QT_CONFIG(library)