cmake: add GnuTLS option

- Option to use GNUTLS was missing. Hence was not able to use GNUTLS
  with ngtcp2 for http3.

Closes #11685

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b09bfd527cf890fd1696ea53f506d8f184096b52..96a03a2206ebb19507ad834d76568a1fb4e9d9b5 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -405,6 +405,7 @@ endif()
 cmake_dependent_option(CURL_USE_MBEDTLS "Enable mbedTLS for SSL/TLS" OFF CURL_ENABLE_SSL OFF)
 cmake_dependent_option(CURL_USE_BEARSSL "Enable BearSSL for SSL/TLS" OFF CURL_ENABLE_SSL OFF)
 cmake_dependent_option(CURL_USE_WOLFSSL "enable wolfSSL for SSL/TLS" OFF CURL_ENABLE_SSL OFF)
+cmake_dependent_option(CURL_USE_GNUTLS  "Enable GNUTLS for SSL/TLS" OFF CURL_ENABLE_SSL OFF)
 
 set(openssl_default ON)
 if(WIN32 OR CURL_USE_SECTRANSP OR CURL_USE_SCHANNEL OR CURL_USE_MBEDTLS OR CURL_USE_WOLFSSL)
@@ -511,6 +512,11 @@ if(CURL_USE_WOLFSSL)
   include_directories(${WolfSSL_INCLUDE_DIRS})
 endif()
 
+if(CURL_USE_GNUTLS)
+   set(SSL_ENABLED ON)
+   set(USE_GNUTLS ON)
+endif()
+
 # Keep ZLIB detection after TLS detection,
 # and before calling openssl_check_symbol_exists().
 
@@ -1444,7 +1450,7 @@ endmacro()
 # NTLM support requires crypto function adaptions from various SSL libs
 # TODO alternative SSL libs tests for SSP1, GNUTLS, NSS
 if(NOT (CURL_DISABLE_CRYPTO_AUTH OR CURL_DISABLE_NTLM) AND
-    (USE_OPENSSL OR USE_MBEDTLS OR USE_DARWINSSL OR USE_WIN32_CRYPTO))
+    (USE_OPENSSL OR USE_MBEDTLS OR USE_DARWINSSL OR USE_WIN32_CRYPTO OR USE_GNUTLS))
   set(use_curl_ntlm_core ON)
 endif()
 
@@ -1544,6 +1550,8 @@ _add_if("Secure Transport" SSL_ENABLED AND USE_SECTRANSP)
 _add_if("mbedTLS"          SSL_ENABLED AND USE_MBEDTLS)
 _add_if("BearSSL"          SSL_ENABLED AND USE_BEARSSL)
 _add_if("wolfSSL"          SSL_ENABLED AND USE_WOLFSSL)
+_add_if("GnuTLS"           SSL_ENABLED AND USE_GNUTLS)
+
 if(_items)
   list(SORT _items)
 endif()