Build fails because path to libLLVM hard coded

[blegat]

The build fails on Arch Linux because the LLVM lib used by Julia is the system library while in the build, the path is hardcoded. The error I get is

$ PREBUILT_CI_BINARIES=1 julia -e 'Pkg.build("Cxx")'
INFO: Building Cxx
--2017-03-19 15:05:56--  https://s3.amazonaws.com/julia-cxx/llvm-linux-3.9.1.tgz
Loaded CA certificate '/etc/ssl/certs/ca-certificates.crt'
Resolving s3.amazonaws.com... 52.216.0.43
Connecting to s3.amazonaws.com|52.216.0.43|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 230366074 (220M) [application/x-tar]
Saving to: ‘llvm-linux-3.9.1.tgz’

llvm-linux-3.9.1.tgz                            100%[=====================================================================================================>] 219.69M   660KB/s    in 5m 47s  

2017-03-19 15:11:44 (648 KB/s) - ‘llvm-linux-3.9.1.tgz’ saved [230366074/230366074]

writing path.jl file
Tuning for julia installation at /usr/bin with sources possibly at /usr/bin/../..
INFO: Building julia binary build
make: *** No rule to make target '/usr/bin/../lib/julia/libLLVM.so', needed by 'build/bootstrap.o'.  Stop.
========================================================================================[ ERROR: Cxx ]========================================================================================

LoadError: failed process: Process(`make -j8 -f BuildBootstrap.Makefile BASE_JULIA_BIN=/usr/bin BASE_JULIA_SRC=/usr/bin/../..`, ProcessExited(2)) [2]
while loading /home/blegat/.julia/v0.5/Cxx/deps/build.jl, in expression starting on line 54

==============================================================================================================================================================================================

=======================================================================================[ BUILD ERRORS ]=======================================================================================

WARNING: Cxx had build errors.

 - packages with build errors remain installed in /home/blegat/.julia/v0.5
 - build the package(s) and all dependencies with `Pkg.build("Cxx")`
 - build a single package by running its `deps/build.jl` script

==============================================================================================================================================================================================

Note that the current julia package of Arch Linux does not include any LLVM file so it fails earlier with Libdl.dlpath(llvm_path). For this reason I have filed this bug and the julia package in community-testing now uses the LLVM system library.

[pwl]

@blegat have you managed to circumvent/fix this bug?

[blegat]

Not really :( If you just want a hack for it to work for you you can hardcode it to the path to libLLVM on your machine.

[pwl]

That's a pity. I had to compile julia from source to get this package to work.

[originalsouth]

@pwl you can change deps/BuildBootstrap.Makefile Line 161:

LIB_DEPENDENCY += $(LIBDIR)/lib$(LLVM_LIB_NAME).$(SHLIB_EXT)

to

LIB_DEPENDENCY += /usr/lib/libLLVM.so

if you use archlinux.

[bovine3dom]

On Arch Linux, I actually had to change deps/BuildBootstrap.Makefile:161 from

LIB_DEPENDENCY += $(LIBDIR)/lib$(LLVM_LIB_NAME).$(SHLIB_EXT)

to

LIB_DEPENDENCY += /usr/lib/libLLVM-4.0.so

and, deps/build.jl:37 from

llvm_path = is_apple[...]"libLLVM-$(Base.libllvm_version)"

to

llvm_path = "libLLVM-4.0"

It then proceeds to happily build (for quite a while) after Pkg.build("Cxx"). Hope this helps someone.

[ararslan]

Is this only with the Julia package in AUR or do you get the same behavior using the official Linux binaries downloaded from https://julialang.org/downloads?

[ShamrockLee]

Not sure if it is the same issue. I'm using Debian Testing (Bullseye), and I encounter LoadError complaining about missing libLLVM-8.0.1.so ERROR: LoadError: could not load library "libLLVM-8.0.1" But I'm pretty sure I have one in /usr/lib/llvm-8/lib and that /lib is symlinked to /usr/lib.

julia> versioninfo()
Julia Version 1.3.0
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-8.0.1 (ORCJIT, skylake)

(jlHEP) pkg> build Cxx
  Building Cxx → `~/.julia/packages/Cxx/UZsgx/deps/build.log`
┌ Error: Error building `Cxx`: 
│ ERROR: LoadError: could not load library "libLLVM-8.0.1"
│ libLLVM-8.0.1.so: cannot open shared object file: No such file or directory
│ Stacktrace:
│  [1] #dlopen#3(::Bool, ::typeof(dlopen), ::String, ::UInt32) at /build/julia-UlDvzA/julia-1.3.0+dfsg/usr/share/julia/stdlib/v1.3/Libdl/src/Libdl.jl:109
│  [2] dlopen at /build/julia-UlDvzA/julia-1.3.0+dfsg/usr/share/julia/stdlib/v1.3/Libdl/src/Libdl.jl:109 [inlined] (repeats 2 times)
│  [3] dlpath(::String) at /build/julia-UlDvzA/julia-1.3.0+dfsg/usr/share/julia/stdlib/v1.3/Libdl/src/Libdl.jl:232
│  [4] top-level scope at /home/shamrock/.julia/packages/Cxx/UZsgx/deps/build.jl:35
│  [5] include at ./boot.jl:328 [inlined]
│  [6] include_relative(::Module, ::String) at ./loading.jl:1105
│  [7] include(::Module, ::String) at ./Base.jl:31
│  [8] include(::String) at ./client.jl:424
│  [9] top-level scope at none:5
│ in expression starting at /home/shamrock/.julia/packages/Cxx/UZsgx/deps/build.jl:35
│ writing path.jl file
│ Tuning for julia installation at /usr/bin with sources possibly at /usr/bin/../..
└ @ Pkg.Operations /build/julia-UlDvzA/julia-1.3.0+dfsg/usr/share/julia/stdlib/v1.3/Pkg/src/backwards_compatible_isolation.jl:649

[salexan2001]

I have the same problem (on arch linux, using the binary package). Temporary fix that worked for me is a symlink in /lib:

sudo ln -s libLLVM-10.0.0.so libLLVM-8.0.1.so

Btw.: This bug affected me as well https://github.com/JuliaInterop/Cxx.jl/issues/464 (I downgraded julia to 1.3 to make it work).