[llvm-dev] Problems trying to build LLVM

Tue Jan 8 22:54:15 PST 2019

Hi Jack,

None of the options you have mentioned are necessary, and neither is Z3.
As Tom said, try doing a clean build (IMO it’s easier with a monorepo) and post exact commands you have used if it fails.

Sent from my iPhone

> On Jan 8, 2019, at 22:44, Tom Stellard via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
>> On 01/08/2019 08:34 PM, Jack Orenstein via llvm-dev wrote:
>> Hi, I am brand new to LLVM, or more precisely, trying to be. I'm getting stuck on compiling LLVM.
>> 
>> - I tried installing on a Mint 18.1 VM with 6GB RAM, and the builds of some large executables were killed by the OOM killer. I finally realized that I needed to build using shared libraries, and succeeded. This was in November.
>> 
>> - I put aside my LLVM project, and just got back to it. I got stuck compiling the Kaleidoscope demo, encountering this error:
>> 
>>    /tmp/kal-2072b8.o:(.data._ZN4llvm30VerifyDisableABIBreakingChecksE+0x0): undefined reference to `llvm::DisableABIBreakingChecks'
>> 
>>  This discussion, from this mailing list, points out that I need to build LLVM with -DLLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING=OFF.
>> 
>> - So now I am trying to rebuild LLVM, and ran into a few new problems. First, I discovered that I need the Z3 theorem prover. Unsure why this problem did not show up before.  Second, I'm running into many errors like this:
>> 
>>    CMake Error at cmake/modules/AddLLVM.cmake:570 (target_link_libraries):
>>      Attempt to add link library "clangAST" to target "clangApplyReplacements"
>>      which is not built in this directory.
>>    Call Stack (most recent call first):
>>      tools/clang/cmake/modules/AddClang.cmake:86 (llvm_add_library)
>>      tools/extra/clang-apply-replacements/CMakeLists.txt:5 (add_clang_library)
>> 
>> Getting LLVM installed is proving much more problematic than I was expecting, based on experience with many other open source projects. Can someone give me a push in the right direction? I started with this document: http://llvm.org/docs/GettingStarted.html, but found no guidance about the problems with huge executables, advice about shared libraries, etc.
>> 
> Hi,
> 
> I would recommend doing a clean build (i.e. delete your current build directory
> or use a new one) of llvm and then post the cmake options you used if you
> still have issues even with a clean build.
> 
> -Tom
> 
>> Thanks.
>> 
>> Jack Orenstein
>> 
>> 
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>> 
> 
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