[PATCH] D30538: Add documentation for -fno-strict-aliasing

Simon Byrne via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Fri May 26 10:51:07 PDT 2017

simonbyrne updated this revision to Diff 100430.
simonbyrne added a comment.

Fix capitalisation.



Index: docs/UsersManual.rst
--- docs/UsersManual.rst
+++ docs/UsersManual.rst
@@ -1098,6 +1098,14 @@
    the behavior of sanitizers in the ``cfi`` group to allow checking
    of cross-DSO virtual and indirect calls.
+.. option:: -f[no-]strict-aliasing
+   Enables/disables the strict aliasing assumption, which assumes that
+   objects of different types do not share the same location in memory.
+   NOTE: Unlike gcc, clang does not allow "type-punning" by writing and
+   reading from different union members without `-fno-strict-aliasing`
+   enabled.
 .. option:: -fstrict-vtable-pointers

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