Committing updates.

cmake-modules/FindDl.cmake

@@ -0,0 +1,45 @@
+###############################################################################
+#  Copyright (c) 2014-2019 libbitcoin developers (see COPYING).
+#
+###############################################################################
+# Finddl
+#
+# Use this module by invoking find_package with the form::
+#
+#   find_package( dl
+#     [REQUIRED]             # Fail with error if dl is not found
+#   )
+#
+#   Defines the following for use:
+#
+#   dl_FOUND        - True if headers and requested libraries were found
+#   dl_LIBRARIES    - dl libraries to be linked
+#   dl_LIBS         - dl libraries to be linked
+#
+
+if (DEFINED dl_FIND_VERSION)
+    message( SEND_ERROR "Library 'dl' unable to process specified version: ${dl_FIND_VERSION}" )
+endif()
+
+if (MSVC)
+    message( STATUS "MSVC environment detection for 'dl' not currently supported." )
+    set( dl_FOUND false )
+else ()
+    # required
+    if ( dl_FIND_REQUIRED )
+        set( _dl_REQUIRED "REQUIRED" )
+    endif()
+
+    find_library(dl_LIBRARIES dl)
+
+    if (dl_LIBRARIES-NOTFOUND)
+        set( dl_FOUND false )
+    else ()
+        set( dl_FOUND true )
+        set( dl_LIBS "-ldl" )
+    endif()
+endif()
+
+if ( dl_FIND_REQUIRED AND ( NOT dl_FOUND ) )
+    message( SEND_ERROR "Library 'dl'  not found." )
+endif()