[LLVMdev] build llvm on CentOS

[Xiaochu Liu]

I set my PATH in .bash_profile and the cmake does recognize them.

But when I compile using 'make', it shows me this:

../../../bin/llvm-tblgen: /usr/lib64/libstdc++.so.6: version
`GLIBCXX_3.4.15' not found (required by ../../../bin/llvm-tblgen)

On Wed, Jul 22, 2015 at 2:08 AM Martin J. O'Riordan <
Martin.ORiordan at movidius.com> wrote:

> For various reasons I have to use an old 5.5 version of CentOS that is
> fairly locked down.  Not only are newer versions of ‘gcc’ available, but
> for operational reasons we have chosen to keep the set of installed tools
> frozen until some more suitable date as there are other teams dependent on
> the current configuration.
>
>
>
> Python is a particular problem because ‘yum’ is written in Python and is
> very version sensitive, so ironically you can update Python and find that ‘
> yum’ no longer works preventing future updates.
>
>
>
> My solution was to download the sources for ‘cmake’ [v3.0.2], ‘python’
> [v2.7.6] and ‘gcc’ [v4.8.2], build them locally, and set my PATH,
> LD_LIBRARY_PATH and LD_RUN_PATH variables to reference this local version.
> Then to configure I have:
>
>
>
> CC=`which gcc` CXX=`which g++` $(CMAKE) -G "Unix Makefiles" \
>
>               ../../llvm \
>
>               "-DCMAKE_BUILD_TYPE:STRING=Debug" \
>
>               "-DCMAKE_EXE_LINKER_FLAGS:STRING=-<*extra link flags*>" \
>
>               "-DCMAKE_CXX_FLAGS:STRING=<*extra C++ flags*>" \
>
>               -DLLVM_TARGETS_TO_BUILD="<*list of targets*>" \
>
>               -DLLVM_DEFAULT_TARGET_TRIPLE=<*default target*> \
>
>               -DENABLE_TIMESTAMPS=1
>
>
>
> Having the locally built version of Python on PATH seems to be fine, but I
> did have to force ‘CC’ and ‘CXX’ to the intended versions.
>
>
>
> If you want the version of ‘clang’ you build to run on other Linux
> distros (Ubuntu for example), I found that the GCC shared library
> dependencies could be a problem, so you might want to include ‘-static-libgcc
> -static-libstdc++ -static’ in your extra link flags which will use the
> static libraries and remove this dependency, although at the expense of
> large executables.
>
>
>
> All the best,
>
>
>
>             MartinO
>
>
>
> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] *On
> Behalf Of *NAKAMURA Takumi
> *Sent:* 22 July 2015 8:25
> *To:* Xiaochu Liu; llvmdev at cs.uiuc.edu
> *Subject:* Re: [LLVMdev] build llvm on CentOS
>
>
>
> Did you specify PYTHON_EXECUTABLE?
>
> See also,
> http://bb.pgr.jp/builders/ninja-x64-msvc-RA-centos6/builds/13948/steps/CMake/logs/stdio
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__bb.pgr.jp_builders_ninja-2Dx64-2Dmsvc-2DRA-2Dcentos6_builds_13948_steps_CMake_logs_stdio&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Mfk2qtn1LTDThVkh6-oGglNfMADXfJdty4_bhmuhMHA&m=Gtl_nwGu5OHHn-liMx2xEnMf9GcBF7eY3pxfEoOxotY&s=yIGK5ZSYerjjwhdmvn_Gdx6Qn4JlEdpBVIwJ0LA9z_Q&e=>
> It's centos6.
>
>
>
> 2015年7月22日(水) 14:29 Xiaochu Liu <xiaochu1122 at gmail.com>:
>
> Hi there,
>
>
>
> I was trying to build llvm on CentOS. The problem is that library on
> CentOS is always so old (Gcc, python). I managed to install local gcc and
> let cmake know. But I couldn't do so with python. I end up comment out the
> check in CMakeList.txt which is not good.
>
> I was wondering if anyone has experience building llvm (using cmake) using
> a local python?
>
>
>
> Thanks,
>
> XIaochu
>
>
>
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