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| author | Peter Collingbourne <peter@pcc.me.uk> | 2016-05-27 22:31:30 +0000 |
|---|---|---|
| committer | Peter Collingbourne <peter@pcc.me.uk> | 2016-05-27 22:31:30 +0000 |
| commit | a4b432f7a4c4458594d70bbb9501a5385a101412 (patch) | |
| tree | 408835672cc675aebc147c4fdc04abca15aa6fa2 /docs/LTOVisibility.rst | |
| parent | 515ac7a1d5c47c0c2d3506191197344f1f54092d (diff) | |
docs: Clarify that LTO visibility is based on source-level symbol visibility.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@271063 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/LTOVisibility.rst')
| -rw-r--r-- | docs/LTOVisibility.rst | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/docs/LTOVisibility.rst b/docs/LTOVisibility.rst index 21a3157c83..67367f3d63 100644 --- a/docs/LTOVisibility.rst +++ b/docs/LTOVisibility.rst @@ -23,14 +23,16 @@ control flow integrity features can only be applied to classes with hidden LTO visibility. A class's LTO visibility is treated as an ODR-relevant property of its definition, so it must be consistent between translation units. -In translation units built with LTO, LTO visibility is based on symbol -visibility or, on the Windows platform, the dllimport and dllexport -attributes. When targeting non-Windows platforms, classes with a visibility -other than hidden visibility receive public LTO visibility. When targeting -Windows, classes with dllimport or dllexport attributes receive public LTO -visibility. All other classes receive hidden LTO visibility. Classes with -internal linkage (e.g. classes declared in unnamed namespaces) also receive -hidden LTO visibility. +In translation units built with LTO, LTO visibility is based on the +class's symbol visibility as expressed at the source level (i.e. the +``__attribute__((visibility("...")))`` attribute, or the ``-fvisibility=`` +flag) or, on the Windows platform, the dllimport and dllexport attributes. When +targeting non-Windows platforms, classes with a visibility other than hidden +visibility receive public LTO visibility. When targeting Windows, classes +with dllimport or dllexport attributes receive public LTO visibility. All +other classes receive hidden LTO visibility. Classes with internal linkage +(e.g. classes declared in unnamed namespaces) also receive hidden LTO +visibility. A class defined in a translation unit built without LTO receives public LTO visibility regardless of its object file visibility, linkage or other |