[cfe-dev] Self build with LTO on OS X

[Jean-Daniel Dupas]

Le 17 mai 2011 à 17:35, Domagoj Saric a écrit :

> 
> Should Clang be able to build itself with LTO/-O4?
> 
> Trying it with both 2.8 and 2.9 official releases fails at link time on OS X 
> 10.6.7...
> 
> If this problem is the same as the general "LTO on OS X" problem, is 
> this/will this be solvable at all? Or will Mac Clang users simply have to 
> work with whatever Clang version (and accompanying system linker) Apple 
> provides them with?
> 
> I install Clang (first built with Apple's llvm-gcc) into /usr/bin (thus 
> overwriting the official one) which, I suppose, should be equivalent or 
> 'better' than setting DYLD_LIBRARY_PATH (as recommended here 
> http://blog.mozilla.com/respindola/2011/03/04/lto-on-os-x and here 
> http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-December/027709.html) but it 
> still does not work.
> 

Overriding clang without updating the LTO library used by the linker (/usr/lib/libLTO.dylib) is probably not a good idea, as the clang TOT may produce bitcode than an old library cannot read.


-- Jean-Daniel