[commit: ghc] master: user-guide: Document -Weverything (9c05fc4)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/9c05fc4c31edde34a68317b45fdd71510d868f60/ghc

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

commit 9c05fc4c31edde34a68317b45fdd71510d868f60
Author: Ben Gamari <bgamari.foss at gmail.com>
Date:   Fri Sep 29 23:29:47 2017 -0400

    user-guide: Document -Weverything
    
    [skip ci]
    
    Reviewers: hvr, austin, dfeuer
    
    Reviewed By: dfeuer
    
    Subscribers: rwbarton, thomie
    
    GHC Trac Issues: #14284
    
    Differential Revision: https://phabricator.haskell.org/D4043


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

9c05fc4c31edde34a68317b45fdd71510d868f60
 docs/users_guide/using-warnings.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/users_guide/using-warnings.rst b/docs/users_guide/using-warnings.rst
index 39d7de4..15b6301 100644
--- a/docs/users_guide/using-warnings.rst
+++ b/docs/users_guide/using-warnings.rst
@@ -79,6 +79,13 @@ The following flags are simple ways to select standard "packages" of warnings:
         * :ghc-flag:`-Widentities`
         * :ghc-flag:`-Wredundant-constraints`
 
+.. ghc-flag:: -Weverything
+    :shortdesc: enable all warnings supported by GHC
+    :type: dynamic
+    :category:
+
+    Turns on every single warning supported by the compiler.
+
 .. ghc-flag:: -Wcompat
     :shortdesc: enable future compatibility warnings
         (details in :ref:`options-sanity`)