Building on RHEL

[mweastwood]

I'm submitting this issue to document my experience trying to build Cxx on RHEL 6.5. Hopefully this helps somebody...

First of all, now that JuliaLang/julia#8297 has been merged, kf/staged needs to be rebased.

I used the following Make.user

$ cat Make.user 
LLVM_VER=svn
LLVM_ASSERTIONS=1
#LLVM_DEBUG=1
BUILD_LLVM_CLANG=1
BUILD_LLDB=1
LLDB_VER = master
USE_LLVM_SHLIB=1
LLDB_DISABLE_PYTHON=1

In order to build LLVM-SVN, I needed to upgrade gcc from v4.4 to v4.9 and apply this patch to LLVM.

LLDB wouldn't link without adding LLVM_LDFLAGS += -lpthread to deps/Makefile

After this, Julia builds and I get

julia> Pkg.clone("https://github.com/Keno/Cxx.jl") 
INFO: Cloning Cxx from https://github.com/Keno/Cxx.jl
INFO: Computing changes...

julia> Pkg.build("Cxx")
INFO: Building Cxx
Tuning for julia installation at: /scr2/mweastwood/julia/usr/bin
    CC /home/mweastwood/.julia/Cxx/deps/build/bootstrap.o
    LINK /home/mweastwood/.julia/Cxx/deps/usr/lib/libcxxffi.so
/scr2/mweastwood/julia/usr/bin/../../usr/lib/liblldbExpression.a(ClangExpressionParser.o): In function `lldb_private::ClangExpressionParser::Parse(lldb_private::Stream&)':
ClangExpressionParser.cpp:(.text._ZN12lldb_private21ClangExpressionParser5ParseERNS_6StreamE+0x394): warning: the use of `mktemp' is dangerous, better use `mkstemp'
Not building debug library because corresponding julia DEBUG library does not exist.
To build, simply run the build again once the library at
/scr2/mweastwood/julia/usr/bin/../../usr/lib/libjulia-debug.so
has been built.

julia> using Cxx
ERROR: error compiling init: could not load module libcxxffi: libcxxffi: cannot open shared object file: No such file or directory
 in include at ./boot.jl:246
 in include_from_node1 at ./loading.jl:128
 in reload_path at ./loading.jl:152
 in _require at ./loading.jl:67
 in require at ./loading.jl:52
while loading /home/mweastwood/.julia/Cxx/src/Cxx.jl, in expression starting on line 37

After changing "libcxxffi" to "libcxxffi.so" here I get

julia> using Cxx
Warning: redefining constant libcxxffi
ERROR: error compiling init: could not load module libcxxffi.so: /scr2/mweastwood/julia/usr/bin/../lib/libcxxffi.so: undefined symbol: _ZN12lldb_private15HostThreadPosix4JoinEPPv
 in include at ./boot.jl:246
 in include_from_node1 at ./loading.jl:128
 in reload_path at ./loading.jl:152
 in _require at ./loading.jl:67
 in require at ./loading.jl:52
while loading /home/mweastwood/.julia/Cxx/src/Cxx.jl, in expression starting on line 37

And now I'm stuck. :(

julia> versioninfo()
Julia Version 0.4.0-dev+715
Commit ea49d91* (2014-09-21 05:48 UTC)
Platform Info:
  System: Linux (x86_64-unknown-linux-gnu)
  CPU: Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Sandybridge)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-svn

[jakebolewski]

Try removing LLDB_LIBS in the Makefile here https://github.com/Keno/Cxx.jl/blob/master/deps/BuildBootstrap.Makefile#L70 and https://github.com/Keno/Cxx.jl/blob/master/deps/BuildBootstrap.Makefile#L82, and rebuild the package.

[mweastwood]

That seems to work.

julia> using Cxx
WARNING: Could not add directory/usr/include/c++/4.8to clang search path!
WARNING: Could not add directory/usr/include/x86_64-linux-gnu/c++/4.8/to clang search path!
WARNING: Could not add directory/usr/include/x86_64-linux-gnuto clang search path!
Warning: requiring "Cxx" did not define a corresponding module.

julia> cxx"""
       uint64_t foo() {
           return $(1);
       }
       """

julia> x = @cxx foo()
0x0000000000000001

Are any of the warnings worth worrying about?

[mweastwood]

Oh nice, the warnings are fixed by modifying https://github.com/Keno/Cxx.jl/blob/master/src/Cxx.jl#L75-78 as appropriate for my system.

[jakebolewski]

Glad you got it working!

[hsnamkoong]

@jakebolewski Could you be more specific on what to remove? I think the line numbers got changed.

[nico202]

@hsnamkoong Just go back in time, and here you are: https://github.com/Keno/Cxx.jl/blob/5d4859919edf35eac618c60107939b2accfe94cb/src/Cxx.jl#L75-78