[llvm] r294725 - Fix doc for `-opt-bisect-limit`: the LTO option is linker specific

[Mehdi Amini via llvm-commits]

r294759

> On Feb 10, 2017, at 9:21 AM, Mehdi Amini via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> 
>> On Feb 10, 2017, at 9:19 AM, Davide Italiano <davide at freebsd.org <mailto:davide at freebsd.org>> wrote:
>> 
>> On Thu, Feb 9, 2017 at 11:21 PM, Mehdi Amini via llvm-commits
>> <llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>> wrote:
>>> Author: mehdi_amini
>>> Date: Fri Feb 10 01:21:06 2017
>>> New Revision: 294725
>>> 
>>> URL: http://llvm.org/viewvc/llvm-project?rev=294725&view=rev <http://llvm.org/viewvc/llvm-project?rev=294725&view=rev>
>>> Log:
>>> Fix doc for `-opt-bisect-limit`: the LTO option is linker specific
>>> 
>>> Modified:
>>>    llvm/trunk/docs/OptBisect.rst
>>> 
>>> Modified: llvm/trunk/docs/OptBisect.rst
>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/OptBisect.rst?rev=294725&r1=294724&r2=294725&view=diff <http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/OptBisect.rst?rev=294725&r1=294724&r2=294725&view=diff>
>>> ==============================================================================
>>> --- llvm/trunk/docs/OptBisect.rst (original)
>>> +++ llvm/trunk/docs/OptBisect.rst Fri Feb 10 01:21:06 2017
>>> @@ -60,12 +60,15 @@ like this:
>>>   clang -O2 -mllvm -opt-bisect-limit=256 my_file.c
>>> 
>>> The -opt-bisect-limit option may also be applied to link-time optimizations by
>>> -using a prefix to indicate that this is a plug-in option for the linker.  The
>>> +using a prefix to indicate that this is a plug-in option for the linker. The
>>> following syntax will set a bisect limit for LTO transformations:
>>> 
>>> ::
>>> 
>>> +  # When using Gold or lld
>>>   clang -flto -Wl,-plugin-opt,-opt-bisect-limit=256 my_file.o my_other_file.o
>>> +  # When using ld64 (macOS)
>> 
>> I don't think this is quite right. lld knows about `-mllvm` (and
>> doesn't really care about `-plugin-opt`, which is accepted for
>> compatibility but ignored). So I guess the correct spelling for lld is
>> `-Wl,-mllvm`.
> 
> Thanks for noticing! I’ll update.
> 
> (I thought that lld options were “compatible” with Gold, I should have checked).
> 
> — 
> Mehdi
> 
> 
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