Merge topic 'ssl-warning'

dd3e476786 OpenSSL: Issue an error if OpenSSL is not found

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Brad King <brad.king@kitware.com>
Merge-request: !3565

CMakeLists.txt

@@ -429,10 +429,7 @@ macro (CMAKE_BUILD_UTILITIES)
     set(_CMAKE_USE_OPENSSL_DEFAULT OFF)
     if(NOT DEFINED CMAKE_USE_OPENSSL AND NOT WIN32 AND NOT APPLE
         AND CMAKE_SYSTEM_NAME MATCHES "(Linux|FreeBSD)")
-      find_package(OpenSSL QUIET)
-      if(OPENSSL_FOUND)
-        set(_CMAKE_USE_OPENSSL_DEFAULT ON)
-      endif()
+      set(_CMAKE_USE_OPENSSL_DEFAULT ON)
     endif()
     option(CMAKE_USE_OPENSSL "Use OpenSSL." ${_CMAKE_USE_OPENSSL_DEFAULT})
     mark_as_advanced(CMAKE_USE_OPENSSL)

Utilities/cmcurl/CMakeLists.txt

@@ -449,7 +449,12 @@ if(CMAKE_USE_SECTRANSP)
 endif()
 
 if(CMAKE_USE_OPENSSL)
-  find_package(OpenSSL REQUIRED)
+  find_package(OpenSSL)
+  if(NOT OpenSSL_FOUND)
+    message(FATAL_ERROR
+      "Could not find OpenSSL. Install an OpenSSL development package or "
+      "configure CMake with -DCMAKE_USE_OPENSSL=OFF to build without OpenSSL.")
+  endif()
   set(SSL_ENABLED ON)
   set(USE_OPENSSL ON)
   set(HAVE_LIBCRYPTO ON)