Re: llvm link statistics
Re: llvm link statistics
- Subject: Re: llvm link statistics
- From: Peter O'Gorman <email@hidden>
- Date: Thu, 02 Jul 2009 14:03:08 -0500
Arne Scheffler wrote:
>
> On Jul 2, 2009, at 6:18 PM, Peter O'Gorman wrote:
>
>> Peter O'Gorman wrote:
>>> Arne Scheffler wrote:
>>>> Hi,
>>>> in the "LLVM-GCC Release Notes" it's stated that "The linker accepts
>>>> some command-line options (such as -mllvm) to turn on LTO debugging,
>>>> statistics dumping, and so on". Can someone tell me what setting I need
>>>> to do to dump the link statistics ?
>>>> I tried to add "-stats" to the "Other Linker flags", but llvm-g++-4.2
>>>> prints a warning about an unrecognized option "-stats".
>>>
>>> It's a linker option, so you need to quote it to hide it from the
>>> compiler.
>>>
>>> -Wl,-mllvm,-stats might do something. The linker will see -mllvm -stats
>>> and pass -stats to libLTO.
>>
>> Should have tried it before posting.
>>
>> -mllvm -stats - no -Wl, quoting.
>
>
> OK, no more warnings, but do you see any output, I don't.
No, it doesn't seem to do much, -mllvm --help, shows a bunch of options,
I doubt that all of them are used at link time. The ld64 test suite
tests the -mllvm functionality using:
-Wl,-mllvm -Wl,--disable-inlining
Hmm, the -Wl, quoting is necessary, as without it gcc unhelpfully turns
--disable-inlining into -fdisable-inlining before passing it along to
ld. Anyway, either way -stats outputs nothing.
I don't know if a later llvm/libLTO is better in this regard, you can
check it out from llvm.org svn and try, if you like.
I suggest filing a radar.
Peter
--
Peter O'Gorman
http://pogma.com
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