Peter,
You totally misunderstand the purpose of bundling the
libLTO.dylib with the llvm-shlibs package. It is only there
to give the user the option to manually replace Apple's
libLTO.dylib with that from the llvm-2.5 sources if they
want to explore the complete functionality of LTO. I never
said that these packages would automatically replace the
system libLTO.dylib, only that they would provide a copy
for the use to try if they were so inclined.
Jack
On Mon, Feb 09, 2009 at 08:44:09PM -0600, Peter O'Gorman wrote:
> 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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