[LLVMdev] Best way to do a lto bootstrap on OS X

[Jean-Daniel Dupas]

AFAIK, ld does not use DYLD_LIBRARY_PATH to lookup libLTO.dylib but contains a reference to @executable_path/../lib/libLTO.dylib.

The only way I managed to load a different LTO library than the default one is to create a symlink pointing to the actual ld binary (as returned by 'xcrun -find ld') and making sure the library I want to load is placed at ../lib/libLTO.dylib relatively to this symlink.

Now, when I invoke the linker using this symlink, it properly load my custom libLTO.dylib library.

According to the ld64 sources, it should have an other way to do that (using the -lto_library option), but I never managed to make it work.

Le 12 nov. 2013 à 15:53, Rafael Espíndola <rafael.espindola at gmail.com> a écrit :

> For dogfooding the compiler I normally use is a LTO bootstrap of clang.
> 
> On linux that is simple to do that since clang passes the correct
> plugin to the linker.
> 
> On OS X ld64 uses libLTO.so it finds via DYLD_LIBRARY_PATH. Should
> clang set that before running the linker? Is there a better way for
> clang to tell the linker which libLTO.so to use?
> 
> Cheers,
> Rafael
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-- Jean-Daniel