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| author | Peter Collingbourne <peter@pcc.me.uk> | 2018-07-17 23:17:16 +0000 |
|---|---|---|
| committer | Peter Collingbourne <peter@pcc.me.uk> | 2018-07-17 23:17:16 +0000 |
| commit | af6ecdb85b3d3233cee3828183372144104f9aca (patch) | |
| tree | 500baa2733d0cf8dbf9741e2660705f88dccdc2e /docs/UsersManual.rst | |
| parent | ed683dcc4ef0546d1e6c04337222d90bac7b785c (diff) | |
| download | clang-af6ecdb85b3d3233cee3828183372144104f9aca.tar.gz | |
Teach Clang to emit address-significance tables.
By default, we emit an address-significance table on all ELF
targets when the integrated assembler is enabled. The emission of an
address-significance table can be controlled with the -faddrsig and
-fno-addrsig flags.
Differential Revision: https://reviews.llvm.org/D48155
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337333 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/UsersManual.rst')
| -rw-r--r-- | docs/UsersManual.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst index 4470dab947..418afb2d54 100644 --- a/docs/UsersManual.rst +++ b/docs/UsersManual.rst @@ -1382,6 +1382,15 @@ are listed below. // value of -fmax-type-align. } +.. option:: -faddrsig, -fno-addrsig + + Controls whether Clang emits an address-significance table into the object + file. Address-significance tables allow linkers to implement `safe ICF + <https://research.google.com/pubs/archive/36912.pdf>`_ without the false + positives that can result from other implementation techniques such as + relocation scanning. Address-significance tables are enabled by default + on ELF targets when using the integrated assembler. This flag currently + only has an effect on ELF targets. Profile Guided Optimization --------------------------- |