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| author | Peter Collingbourne <peter@pcc.me.uk> | 2016-02-01 18:55:50 +0000 |
|---|---|---|
| committer | Peter Collingbourne <peter@pcc.me.uk> | 2016-02-01 18:55:50 +0000 |
| commit | f84c511056bc9cca4a50bbafaeb249e7a76ccd94 (patch) | |
| tree | 150ebf6559807b8e274e33d34e0972e3f35e8f3a /docs/ControlFlowIntegrity.rst | |
| parent | 20fa418bf12e4131731a7833358591f1d680fa45 (diff) | |
docs: Clarify that cfi-unrelated-cast is based on lifetime.
Also restore Makefile.sphinx which is needed to build the documentation.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@259382 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/ControlFlowIntegrity.rst')
| -rw-r--r-- | docs/ControlFlowIntegrity.rst | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/ControlFlowIntegrity.rst b/docs/ControlFlowIntegrity.rst index 780ff882d0..c403610952 100644 --- a/docs/ControlFlowIntegrity.rst +++ b/docs/ControlFlowIntegrity.rst @@ -129,7 +129,8 @@ type ``void*`` or another unrelated type (which can be checked with The difference between these two types of casts is that the first is defined by the C++ standard to produce an undefined value, while the second is not in itself undefined behavior (it is well defined to cast the pointer back -to its original type). +to its original type) unless the object is uninitialized and the cast is a +``static_cast`` (see C++14 [basic.life]p5). If a program as a matter of policy forbids the second type of cast, that restriction can normally be enforced. However it may in some cases be necessary |