[PATCH] D65706: [docs] document -Weveything more betterer

[JF Bastien via Phabricator via cfe-commits]

jfb created this revision.
jfb added a reviewer: aaron.ballman.
Herald added subscribers: cfe-commits, dexonsmith, jkorous.
Herald added a project: clang.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D65706

Files:
  clang/docs/UsersManual.rst


Index: clang/docs/UsersManual.rst
===================================================================
--- clang/docs/UsersManual.rst
+++ clang/docs/UsersManual.rst
@@ -992,13 +992,24 @@
 Enabling All Diagnostics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-In addition to the traditional ``-W`` flags, one can enable **all**
-diagnostics by passing :option:`-Weverything`. This works as expected
-with
-:option:`-Werror`, and also includes the warnings from :option:`-pedantic`.
-
-Note that when combined with :option:`-w` (which disables all warnings), that
-flag wins.
+In addition to the traditional ``-W`` flags, one can enable **all** diagnostics
+by passing :option:`-Weverything`. This works as expected with
+:option:`-Werror`, and also includes the warnings from :option:`-pedantic`. Some
+diagnostics contradict each other, users :option:`-Weverything` therefore often
+disable many diagnostics such as :option:`-Wno-c++98-compat`
+:option:`-Wno-c++-compat`.
+
+Since :option:`-Weverything` enables every diagnostic, we generally don't
+recommend using it. :option:`-Wall` :option:`-Wextra` are a better choice for
+most projects. Using :option:`-Weverything` means that updating your compiler is
+more difficult because you're exposed to experimental diagnostics which might be
+of lower quality than the default once. If you do use :option:`-Weverything`
+then we advise that you address all new compiler diagnostics as they get added
+to clang, either by fixing everything they find or explicitly disabling that
+diagnostic with its corresponding `Wno-` option.
+
+Note that when combined with :option:`-w` (which disables all warnings),
+disabling all warnings wins.
 
 Controlling Static Analyzer Diagnostics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


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