clang 4.0.0 with_lld_is_ld build

[Shawn Webb]

Hey All,

On a system with clang 4.0.0 already installed with lld as ld, I get the 
following error compiling the latest HEAD of projects/clang400-import when 
WITH_LLD_IS_LD is set:

===> usr.bin/clang/lld (obj,all,install)
In file included from 
/scratch/fbsd/contrib/llvm/tools/lld/ELF/InputFiles.cpp:19:
In file included from 
/scratch/fbsd/contrib/llvm/include/llvm/Bitcode/BitcodeReader.h:19:
In file included from 
/scratch/fbsd/contrib/llvm/include/llvm/IR/ModuleSummaryIndex.h:25:
In file included from /scratch/fbsd/contrib/llvm/include/llvm/IR/Module.h:21:
In file included from /scratch/fbsd/contrib/llvm/include/llvm/IR/Function.h:24:
In file included from /scratch/fbsd/contrib/llvm/include/llvm/IR/Argument.h:19:
/scratch/fbsd/contrib/llvm/include/llvm/IR/Attributes.h:71:14: fatal error: 
'llvm/IR/Attributes.gen' file not found
    #include "llvm/IR/Attributes.gen"

Steps to reproduce:

1. Build and install a world with WITH_LLD_IS_LD set. The first build will 
succeed.
2. After the new world is installd, verify that /usr/bin/ld is in fact lld by 
running `ld -version`
3. If not, then set the symlink to /usr/bin/ld.lld
4. rm -rf the object directory (for me: /usr/obj/scratch/clang400)
5. do a new world build with WITH_LLD_IS_LD set. This will fail.

Thanks,

-- 
Shawn Webb
Cofounder and Security Engineer
HardenedBSD

GPG Key ID:          0x6A84658F52456EEE
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