[llvm-dev] Problems trying to build LLVM

[Tom Stellard via llvm-dev]

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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