[llvm-dev] Errors linking with LLVM 5.0 - dump() missing

David Keaton via llvm-dev llvm-dev at lists.llvm.org
Tue Sep 26 07:04:59 PDT 2017

On 09/25/2017 06:47 PM, David Keaton via llvm-dev wrote:
> On 09/25/2017 06:19 PM, Matthias Braun wrote:
>>> On Sep 25, 2017, at 6:03 PM, David Keaton via llvm-dev 
>>> <llvm-dev at lists.llvm.org> wrote:
>>> On 09/25/2017 02:53 PM, Matthias Braun via llvm-dev wrote:
>> In the meantime `cmake -DCMAKE_CXX_FLAGS="-DLLVM_ENABLE_DUMP"` should 
>> do the trick.
>       Thank you.  That was the flag we needed.
>       Unfortunately, when I tried this just now, I found that the 
> declaration of llvm::MachineRegisterInfo::dumpUses() in 
> include/llvm/CodeGen/MachineRegisterInfo.h is missing the check against 
> LLVM_ENABLE_DUMP.  It has only
> #ifndef NDEBUG
> which causes the build to fail because the definition in 
> lib/CodeGen/MachineRegisterInfo.cpp is guarded by this.
> #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

      Unfortunately, this was only the beginning.  I tried updating the 
header file to test LLVM_ENABLE_DUMP as well, and when I did that, the 
build hit another such case, which I tried fixing, and then it hit 
another, and another.  Here is what I have found so far that would need 
to be fixed under the current arrangement.






	emitted code inside EmitSchedModel()

Unknown location in AArch64
	This is not the end.  I just lost track of what to change at this point.

      Perhaps it would be easier to revert the change that hid the 
dump() methods.  That would have another advantage as well.  Before LLVM 
5.0.0, Chapel had the ability to link with an existing pre-built LLVM if 
it was installed on the system.  With LLVM 5.0.0, we cannot do that any 
longer because we need to compile with LLVM_ENABLE_DUMP defined.  It 
takes 10x longer to compile LLVM than it does to compile the rest of 
Chapel, so it is quite a burden to require a recompilation of LLVM to 
get the dump() methods.


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