1 files changed, 51 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8061d14d..616a70db6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -438,6 +438,56 @@ if(USE_NGHTTP2)
   list(APPEND CURL_LIBS ${NGHTTP2_LIBRARIES})
 endif()
 
+function(CheckQuicSupportInOpenSSL)
+  # Be sure that the OpenSSL library actually supports QUIC.
+  cmake_push_check_state()
+  set(CMAKE_REQUIRED_INCLUDES   "${OPENSSL_INCLUDE_DIR}")
+  set(CMAKE_REQUIRED_LIBRARIES  "${OPENSSL_LIBRARIES}")
+  check_symbol_exists(SSL_CTX_set_quic_method "openssl/ssl.h" HAVE_SSL_CTX_SET_QUIC_METHOD)
+  if(NOT HAVE_SSL_CTX_SET_QUIC_METHOD)
+    message(FATAL_ERROR "QUIC support is missing in OpenSSL/boringssl. Try setting -DOPENSSL_ROOT_DIR")
+  endif()
+  cmake_pop_check_state()
+endfunction()
+
+option(USE_NGTCP2 "Use ngtcp2 and nghttp3 libraries for HTTP/3 support" OFF)
+if(USE_NGTCP2)
+  if(USE_OPENSSL)
+    find_package(NGTCP2 REQUIRED OpenSSL)
+    CheckQuicSupportInOpenSSL()
+  elseif(USE_GNUTLS)
+    # TODO add GnuTLS support as vtls library.
+    find_package(NGTCP2 REQUIRED GnuTLS)
+  else()
+    message(FATAL_ERROR "ngtcp2 requires OpenSSL or GnuTLS")
+  endif()
+  set(USE_NGTCP2 ON)
+  include_directories(${NGTCP2_INCLUDE_DIRS})
+  list(APPEND CURL_LIBS ${NGTCP2_LIBRARIES})
+
+  find_package(NGHTTP3 REQUIRED)
+  set(USE_NGHTTP3 ON)
+  include_directories(${NGHTTP3_INCLUDE_DIRS})
+  list(APPEND CURL_LIBS ${NGHTTP3_LIBRARIES})
+endif()
+
+option(USE_QUICHE "Use quiche library for HTTP/3 support" OFF)
+if(USE_QUICHE)
+  if(USE_NGTCP2)
+    message(FATAL_ERROR "Only one HTTP/3 backend can be selected!")
+  endif()
+  find_package(QUICHE REQUIRED)
+  CheckQuicSupportInOpenSSL()
+  set(USE_QUICHE ON)
+  include_directories(${QUICHE_INCLUDE_DIRS})
+  list(APPEND CURL_LIBS ${QUICHE_LIBRARIES})
+  cmake_push_check_state()
+  set(CMAKE_REQUIRED_INCLUDES   "${QUICHE_INCLUDE_DIRS}")
+  set(CMAKE_REQUIRED_LIBRARIES  "${QUICHE_LIBRARIES}")
+  check_symbol_exists(quiche_conn_set_qlog_fd "quiche.h" HAVE_QUICHE_CONN_SET_QLOG_FD)
+  cmake_pop_check_state()
+endif()
+
 if(WIN32)
   set(USE_WIN32_CRYPTO ON)
 endif()
@@ -1276,6 +1326,7 @@ _add_if("NTLM_WB"     use_ntlm AND NOT CURL_DISABLE_HTTP AND NTLM_WB_ENABLED)
 _add_if("TLS-SRP"       USE_TLS_SRP)
 # TODO option --with-nghttp2 tests for nghttp2 lib and nghttp2/nghttp2.h header
 _add_if("HTTP2"         USE_NGHTTP2)
+_add_if("HTTP3"         USE_NGTCP2 OR USE_QUICHE)
 _add_if("HTTPS-proxy"   SSL_ENABLED AND (USE_OPENSSL OR USE_GNUTLS OR USE_NSS))
 string(REPLACE ";" " " SUPPORT_FEATURES "${_items}")
 message(STATUS "Enabled features: ${SUPPORT_FEATURES}")