[cfe-dev] Trouble building Clang on CentOS 6

[Jeff Hammond via cfe-dev]

I built the latest Git on CentOS 6 two days ago, but I use upgraded CMake,
GCC, Python and other things.  So there is nothing fundamentally wrong with
CentOS other than the built-in packages it comes with are too old.

I recall CMake does something idiotic wherein it prefers /usr/bin/python
over `which python`, which you have to manually override with
-DPYTHON_EXECUTABLE=`which python`, or at least that is what I archived in
my successful build script.
https://github.com/jeffhammond/HPCInfo/blob/master/buildscripts/llvm-git.sh#L95

Jeff

On Fri, Sep 1, 2017 at 3:18 PM, Uri Moszkowicz via cfe-dev <
cfe-dev at lists.llvm.org> wrote:
>
> Hi Csaba,
> I started with the instructions on the LLVM website. The problem is that
CentOS 6 does not meet the build requirements, shown here:
>
> http://llvm.org/docs/GettingStarted.html#requirements
>
> I built the required versions of software but the instructions don't
cover how to utilize them.
>
> Anyway, I compiled again with VERBOSE and discovered the problem is
missing LibraryDependencies.inc. I specified python27 with a CMake variable
and added it to my PATH but it still didn't solve the problem:
>
> make[2]: Nothing to be done for
`projects/compiler-rt/lib/builtins/CMakeFiles/builtins.dir/build'.
> make[2]: Leaving directory `<clang-4.0.1>/src/build/llvm-4.0.1-redhat6'
> [ 36%] Built target builtins
> <llvm-4.0.1>/tools/llvm-config/llvm-config.cpp:47:35: fatal error:
LibraryDependencies.inc: No such file or directory
>  #include "LibraryDependencies.inc"
>                                    ^
> compilation terminated.
> make[2]: ***
[tools/llvm-config/CMakeFiles/llvm-config.dir/llvm-config.cpp.o] Error 1
> make[2]: Leaving directory `<clang-4.0.1>/src/build/llvm-4.0.1-redhat6'
> make[1]: *** [tools/llvm-config/CMakeFiles/llvm-config.dir/all] Error 2
>
> How can I move past this error? Despite setting LD_LIBRARY_PATH and
CMAKE_CXX_LINK_FLAGS as indicated in the instructions above, I also still
seem to be getting GLIBC errors too :(
>
> Thanks,
> Uri
>
>
> On Thu, Aug 31, 2017 at 3:47 AM, Csaba Raduly <rcsaba at gmail.com> wrote:
>>
>> Hi Uri,
>>
>> On Wed, Aug 30, 2017 at 11:35 PM, Uri Moszkowicz via cfe-dev
>> <cfe-dev at lists.llvm.org> wrote:
>> > Hi,
>> > I'm having trouble building Clang on CentOS 6 and am hoping someone
here can
>> > help. I followed the instructions on this website:
>> >
>> > http://btorpey.github.io/blog/2015/01/02/building-clang/
>>
>> Seems a bit old, why not  https://clang.llvm.org/get_started.html
>>
>> >
>> > I'm using GCC 6.3.0 and Python 2.7.13, both also built from source
using
>> > these options:
>> >
>> > -DCMAKE_C_COMPILER=<gcc-6.3.0>/redhat6/bin/gcc
>> > -DCMAKE_CXX_COMPILER=<gcc-6.3.0>/redhat6/bin/g++
>> > -DCMAKE_CXX_LINK_FLAGS='-L<gcc-6.3.0>/redhat6/lib64
>> > -Wl,-rpath,<gcc-6.3.0>/redhat6/lib64'
>> > -DLLVM_ENABLE_ASSERTIONS=ON
>> > -DCMAKE_BUILD_TYPE=Release
>> > -DLLVM_TARGETS_TO_BUILD=X86
>> > -DGCC_INSTALL_PREFIX=<gcc-6.3.0>/redhat6
>> > -DPYTHON_EXECUTABLE:FILEPATH=<python-2.7.13>/redhat6/bin/python
>> > -DCMAKE_INSTALL_PREFIX=<clang-4.0.1>/redhat6
>> >
>> > The errors I'm seeing look like this (I used -j32):
>> >
>> > [  4%] Building CXX object
>> > lib/TableGen/CMakeFiles/LLVMTableGen.dir/Main.cpp.o
>> > [  4%] Building CXX object
>> > lib/Option/CMakeFiles/LLVMOption.dir/OptTable.cpp.o
>> > [  6%] Building C object
>> >
projects/compiler-rt/lib/builtins/CMakeFiles/clang_rt.builtins-x86_64.dir/absvdi2.c.o
>> > [  6%] Building CXX object
>> >
projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonLibc.x86_64.dir/sanitizer_coverage_mapping_libcdep.cc.o
>> > Scanning dependencies of target LLVMSupport
>> > g++: fatal error: no input files
>> > compilation terminated.
>> > make[2]: *** [bin/llvm-PerfectShuffle] Error 1
>> > make[1]: ***
[utils/PerfectShuffle/CMakeFiles/llvm-PerfectShuffle.dir/all]
>> > Error 2
>> (snip)
>> >
>> > Any thoughts about what else I need to do?
>>
>> For debugging purposes, build with
>>
>> make VERBOSE=1
>>
>> This would print the actual compiler invocation; the we'll have a
>> better chance figuring out what went wrong.
>>
>> Csaba
>> --
>> GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
>> The Tao of math: The numbers you can count are not the real numbers.
>> Life is complex, with real and imaginary parts.
>> "Ok, it boots. Which means it must be bug-free and perfect. " -- Linus
Torvalds
>> "People disagree with me. I just ignore them." -- Linus Torvalds
>
>
>
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--
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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