[commit: ghc] master: Document -ddump-timings (2da7813)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/2da7813b771edcb3efb1b067b986d10f5de4beaf/ghc

>---------------------------------------------------------------

commit 2da7813b771edcb3efb1b067b986d10f5de4beaf
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Wed Nov 15 17:28:48 2017 -0500

    Document -ddump-timings


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2da7813b771edcb3efb1b067b986d10f5de4beaf
 docs/users_guide/debugging.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/users_guide/debugging.rst b/docs/users_guide/debugging.rst
index 0d3872e..d0f479c 100644
--- a/docs/users_guide/debugging.rst
+++ b/docs/users_guide/debugging.rst
@@ -74,6 +74,11 @@ Dumping out compiler intermediate structures
     aren't). This flag makes debugging output appear in the more verbose
     debug style.
 
+.. ghc-flag:: -ddump-timings
+    :shortdesc: Dump per-pass timing and allocation statistics
+    :type: dynamic
+
+    Show allocation and runtime statistics for various stages of compilation.
 
 GHC is a large program consisting of a number of stages. You can tell GHC to
 dump information from various stages of compilation using the ``-ddump-⟨pass⟩``