[Bf-committers] building blender

[Sergey Sharybin]

Hi,

You've linked quite old discussion which comes from the times when LLVM-3.6
was not supported by changed JIT API, this has been changed now and
LLVM-3.6 is suported.

The issue here, however, is that different distros are packing LLVM
differently. For example, compiling LLVM from sources works just fine with
OSL's CMake rules, but Ubuntu's LLVM package is lacking some corner case
checks for that.

You can either manually compile OSL with tweaks to the CMake rules to
ignore MCJIT library all together or (which is better) submit report to OSL
upstream about OSL not compiling correct with your LLVM.

Some disclaimers:

- install_deps.sh installs default version of the LLVM if the requested one
is not available (requested one is LLVM-3.4 in fact)
- I don't know if the rules in install_des.sh will work correct with LLVM >
3.4 btw. Such configuration requires OSL to be compiled with C++11, which
we don't do yet.


On Fri, Mar 18, 2016 at 10:43 AM, Owen Hogarth II <gurenchan at gmail.com>
wrote:

> The issue if I'm correct is that OSL just doesn't work with llvm 3.6 but
> the blender script automatically downloads llvm 3.6
> The OSL github issue that I linked to has some recent information but I
> don't know what blender's stance on it.
>
> I've built blender a while ago no problems. Currently I build w --skip-osl
> for the moment as a workaround.
>
> I'd still like to hear what the team has to say about OSL on linux though.
>
> Best,
> Owen
>
> On Fri, Mar 18, 2016 at 1:33 PM, Tianwei Shen <shentianweipku at gmail.com>
> wrote:
>
> > Hi,
> >
> > I encountered the same problem when compiling blender on centos 7. It
> seems
> > that there is some problem with OSL:
> >
> > Building OpenShadingLanguage-1.7.1
> > Ensuring /opt/lib exists and is writable by us
> > ILMBASE_HOME=/opt/lib/openexr
> > -- The C compiler identification is GNU 4.8.5
> > -- The CXX compiler identification is GNU 4.8.5
> > -- Check for working C compiler: /usr/bin/cc
> > -- Check for working C compiler: /usr/bin/cc -- works
> > -- Detecting C compiler ABI info
> > -- Detecting C compiler ABI info - done
> > -- Detecting C compile features
> > -- Detecting C compile features - done
> > -- Check for working CXX compiler: /usr/bin/c++
> > -- Check for working CXX compiler: /usr/bin/c++ -- works
> > -- Detecting CXX compiler ABI info
> > -- Detecting CXX compiler ABI info - done
> > -- Detecting CXX compile features
> > -- Detecting CXX compile features - done
> > -- Project build dir =
> > /home/tianwei/src/blender-deps/OpenShadingLanguage-1.7.1/build
> > -- CMAKE_CXX_COMPILER is /usr/bin/c++
> > -- CMAKE_CXX_COMPILER_ID is GNU
> > -- Compiling with SIMD level sse2
> > -- Setting Namespace to:
> > -- platform = linux64
> > -- Partio not found
> > -- CMAKE_INSTALL_RPATH = /opt/lib/osl-1.7.1/lib
> > -- Create oslversion.h from oslversion.h.in
> > CMake Error: The following variables are used in this project, but they
> are
> > set to NOTFOUND.
> > Please set them or make sure they are set and tested correctly in the
> CMake
> > files:
> > LLVM_MCJIT_LIBRARY
> >     linked by target "oslexec" in directory
> > /home/tianwei/src/blender-deps/OpenShadingLanguage-1.7.1/src/liboslexec
> >
> > -- Configuring incomplete, errors occurred!
> > See also
> >
> >
> "/home/tianwei/src/blender-deps/OpenShadingLanguage-1.7.1/build/CMakeFiles/CMakeOutput.log".
> > See also
> >
> >
> "/home/tianwei/src/blender-deps/OpenShadingLanguage-1.7.1/build/CMakeFiles/CMakeError.log".
> > make: *** No targets specified and no makefile found.  Stop.
> > make: *** No rule to make target `clean'.  Stop.
> > ERROR! OpenShadingLanguage-1.7.1 failed to compile, exiting
> >
> > This compiling process works fine on my mac.
> >
> >
> >
> > Thanks,
> > Tianwei
> >
> > On Fri, Mar 18, 2016 at 5:27 AM, Owen Hogarth II <gurenchan at gmail.com>
> > wrote:
> >
> > > Howdy
> > >
> > > compiling blender from source today it seems to want to update to llvm
> > 3.6
> > > but of OSL doesn't build with llvm 3.6
> > >
> > > I manually downgraded my own copies of llvm and clang to 3.5 but the
> > > install_deps.sh script pulls down 3.6
> > >
> > > there's this long thread about it on github:
> > > https://github.com/imageworks/OpenShadingLanguage/issues/480
> > >
> > > I'd like to avoid mucking around in the install script so is there any
> > > officially supported way to build blender with OSL from source?
> > >
> > > Best,
> > > Owen
> > > _______________________________________________
> > > Bf-committers mailing list
> > > Bf-committers at blender.org
> > > http://lists.blender.org/mailman/listinfo/bf-committers
> > >
> > _______________________________________________
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> > Bf-committers at blender.org
> > http://lists.blender.org/mailman/listinfo/bf-committers
> >
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-- 
With best regards, Sergey Sharybin