[Bug c++/86672] New: Facing issue with gcc-4.9.0 while using with llvm-6.0.1

[abinaya.manikandan at wipro dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86672

            Bug ID: 86672
           Summary: Facing issue with gcc-4.9.0 while using with
                    llvm-6.0.1
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: abinaya.manikandan at wipro dot com
  Target Milestone: ---

Hi,

We are trying to build llvm-6.0.1 with gcc version 4.9.0.
Please find our machine and installed component details below:

**********************************************************************************
[root@abinaya-llvm6 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.9 (Santiago)

[root@abinaya-llvm6 ~]# gcc --version
gcc (GCC) 4.9.0
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************************

Please find below command which we are trying to install llvm with gcc:

********************************************************************************
cmake -DCMAKE_INSTALL_PREFIX=%{_prefix} -DCMAKE_BUILD_WITH_INSTALL_RPATH=1 \
            -DCMAKE_INSTALL_RPATH=$ORIGIN/../lib:%{gccpath}/lib64\
            -DCMAKE_CROSSCOMPILING=True -DCMAKE_BUILD_TYPE=Release  \
            -Wno-dev  --enable-zlib -DCMAKE_BUILD_TYPE=Release \
            --enable-gold --enable-plugins \
            -DLLVM_ENABLE_ZLIB:BOOL=ON ..

make

make install 
********************************************************************************
Only the cmake step getting success.
When we are trying to run "make" facing below issue:

*******************************************************************************
In file included from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/utility:198:0,
                 from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/algorithm:642,
                 from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/src/algorithm.cpp:10:
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__tuple: In
substitution of 'template<bool ..._Pred> using __all =
std::__1::is_same<std::__1::__all_dummy<_Pred ...>,
std::__1::__all_dummy<(void(_Pred), true)...> > [with bool ..._Pred =
{{true}...}]':
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__tuple:401:84:  
required from here
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__tuple:395:82:
internal compiler error: unexpected expression '(void({true}), true)...' of
kind expr_pack_expansion
 using __all = is_same<__all_dummy<_Pred...>, __all_dummy<((void)_Pred,
true)...>>;
                                                                               
  ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[2]: ***
[projects/libcxx/lib/CMakeFiles/cxx_objects.dir/__/src/algorithm.cpp.o] Error 1
In file included from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/utility:198:0,
                 from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/algorithm:642,
                 from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__bit_reference:15,
                 from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/vector:266,
                 from
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxxabi/src/cxa_demangle.cpp:20:
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__tuple: In
substitution of 'template<bool ..._Pred> using __all =
std::__1::is_same<std::__1::__all_dummy<_Pred ...>,
std::__1::__all_dummy<(void(_Pred), true)...> > [with bool ..._Pred =
{{true}...}]':
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__tuple:401:84:  
required from here
/root/rpmbuild/BUILD/llvm-6.0.0.src/projects/libcxx/include/__tuple:395:82:
internal compiler error: unexpected expression '(void({true}), true)...' of
kind expr_pack_expansion
 using __all = is_same<__all_dummy<_Pred...>, __all_dummy<((void)_Pred,
true)...>>;
                                                                               
  ^
*******************************************************************************

Can anyone help me to fix this issue.

Regards,
Abinaya