Jack Howarth wrote:
> Peter,
>    That is not what Chris Lattner said...

He says that /usr/bin/ld and /Developer/usr/bin/ld differ, which it
seems, they do, ld -v for /Developer/usr/bin includes the string "llvm
version ..., Apple Build ...", which does not appear for /usr/bin/ld -v.

He also says to replace /Developer/usr/lib/libLTO.dylib with the one you
built from the llvm sources. I doubt very much that a fink package that
replaces files in /Developer/usr/lib would be tolerated.

> 
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-January/019687.html
> 
> Remember that the libLTO.dylib included in Xcode 3.1.2 is
> generated from the llvm source tree, specifically in
> llvm-2.5/tools/lto, and definitely is a work in progress.
> I would be surprised if the llvm in Xcode 3.1.2 is newer
> than llvm-2.3.

You don't appear to realize what I was said. I said that the libLTO
included in Xcode does more than you claimed ("only supports dead code
elimination"), not that it was newer.

I also said that since it is used exclusively by ld, it was unlikely to
be found by /usr/bin/ld or /Developer/usr/bin/ld (both of which look for
@executable_path/../lib/libLTO.dylib) if it is sitting in /sw/lib.

I continue to see little point in a fink libLTO.

Peter

>            Jack
> 
> 
> On Mon, Feb 09, 2009 at 08:32:14AM -0600, Peter O'Gorman wrote:
>> Jack Howarth wrote:
>>
>>> The libLTO.dylib in Xcode 3.2.1 only supports dead code
>>> elimination at -O4 whereas the libLTO.dylib in llvm 2.5
>>> provides additional optiminizations like inlining across
>>> code files.
>> I am not sure about the utility of a fink providied libLTO.
>>
>> The llvm-gcc release notes say:
>> "
>> LLVM-GCC 4.2 supports a wide range of interprocedural optimizations,
>> including global variable optimization, inter modular inlining,
>> interprocedural constant propagation and dead argument elimination.
>> "
>>
>> http://developer.apple.com/ReleaseNotes/DeveloperTools/RN-llvm-gcc/index.html
>>
>> And, since libLTO functions are called by ld to to do the optimizations,
>> how are you ensuring that /usr/bin/ld is using fink's libLTO?
>>
>> Peter
>> -- 
>> Peter O'Gorman
>> http://pogma.com


-- 
Peter O'Gorman
http://pogma.com

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