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Srikanth Bemineni via llvm-dev

2015-Sep-27 00:04 UTC

[llvm-dev] libcxx build error.

Hi,

I am trying to build llvm 3.4.2 on Centos 6.6. I am getting this below
build error , while building the libcxx. I followed the build procedure
based of http://clang.llvm.org/get_started.html. I cannot move to a higher
version, Since we need to develop on CentOS 6.6  and LLVM 3.4.2 ,is the
last version that supports gcc 3.4.2. Starting from LLVM 3.5.0, there has
been a huge  jump to gcc 4.7.0.

I am just starting to get acquainted to LLVM. So please bare with my
questions.

Linking CXX executable ../../bin/not
[ 52%] Built target not
Scanning dependencies of target yaml-bench
[ 52%] Building CXX object
utils/yaml-bench/CMakeFiles/yaml-bench.dir/YAMLBench.cpp.o
Linking CXX executable ../../bin/yaml-bench
[ 52%] Built target yaml-bench
Scanning dependencies of target cxx
[ 52%] Building CXX object
projects/libcxx-3.4.2/lib/CMakeFiles/cxx.dir/__/src/string.cpp.o
In file included from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/algorithm:624,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/string:439,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/src/string.cpp:12:
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/type_traits:3280:
error: expected primary-expression before ‘decltype’
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/type_traits:3280:
error: expected ‘;’ before ‘decltype’
In file included from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/algorithm:626,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/string:439,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/src/string.cpp:12:
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/utility:320:
error: ‘std::__1::pair<_T1, _T2>::pair(std::__1::pair<_T1,
_T2>&&)’ cannot
be defaulted
In file included from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/memory:603,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/algorithm:627,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/string:439,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/src/string.cpp:12:
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/tuple:461:
error: ‘std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx ...>,
_Tp
...>::__tuple_impl(std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx
...>, _Tp ...>&&)’ cannot be defaulted
make[2]: ***
[projects/libcxx-3.4.2/lib/CMakeFiles/cxx.dir/__/src/string.cpp.o] Error 1
make[1]: *** [projects/libcxx-3.4.2/lib/CMakeFiles/cxx.dir/all] Error 2
make: *** [all] Error 2



With Regards
Srikanth Bemineni
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Srikanth Bemineni via llvm-dev

2015-Sep-27 01:45 UTC

head link

[llvm-dev] libcxx build error.

Hi,

Is libcxx supported on gcc 4.4.7 which comes with CentOS 6.6. Are LLVM
releases very much constrained to the gcc version specified in the software
requirements ?
I followed the patch mentioned in this link
http://comments.gmane.org/gmane.comp.compilers.clang.scm/87139

Index: include/__config
==================================================================---
include/__config	(revision 194869)
+++ include/__config	(working copy)
 <at>  <at>  -389,9 +389,7  <at>  <at>
 #endif

 #if _GNUC_VER < 404
-#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
 #define _LIBCPP_HAS_NO_DECLTYPE
-#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
 #define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
 #define _LIBCPP_HAS_NO_UNICODE_CHARS
 #define _LIBCPP_HAS_NO_VARIADICS
 <at>  <at>  -402,6 +400,11  <at>  <at>
 #define _LIBCPP_HAS_NO_NULLPTR
 #endif

+#if _GNUC_VER < 407
+#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
+#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#endif
+
 #endif  // __GXX_EXPERIMENTAL_*CXX0X*__

 #define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { namespace
_LIBCPP_NAMESPACE {




To get rid of the type_traits:3280 error. But I am now stuck with





[ 54%] Building CXX object
projects/libcxx/lib/CMakeFiles/cxx.dir/__/src/string.cpp.o
In file included from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx/include/memory:603,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx/include/algorithm:627,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx/include/string:439,
                 from
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx/src/string.cpp:12:
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx/include/tuple:461:
error: ‘std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx ...>,
_Tp
...>::__tuple_impl(std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx
...>, _Tp ...>&&)’ cannot be defaulted
make[2]: *** [projects/libcxx/lib/CMakeFiles/cxx.dir/__/src/string.cpp.o]
Error 1
make[1]: *** [projects/libcxx/lib/CMakeFiles/cxx.dir/all] Error 2
make: *** [all] Error 2

Srikanth Bemineni


On Sat, Sep 26, 2015 at 5:04 PM, Srikanth Bemineni <
bemineni.srikanth at gmail.com> wrote:
> Hi,
>
> I am trying to build llvm 3.4.2 on Centos 6.6. I am getting this below
> build error , while building the libcxx. I followed the build procedure
> based of http://clang.llvm.org/get_started.html. I cannot move to a
> higher version, Since we need to develop on CentOS 6.6  and LLVM 3.4.2 ,is
> the last version that supports gcc 3.4.2. Starting from LLVM 3.5.0, there
> has been a huge  jump to gcc 4.7.0.
>
> I am just starting to get acquainted to LLVM. So please bare with my
> questions.
>
> Linking CXX executable ../../bin/not
> [ 52%] Built target not
> Scanning dependencies of target yaml-bench
> [ 52%] Building CXX object
> utils/yaml-bench/CMakeFiles/yaml-bench.dir/YAMLBench.cpp.o
> Linking CXX executable ../../bin/yaml-bench
> [ 52%] Built target yaml-bench
> Scanning dependencies of target cxx
> [ 52%] Building CXX object
> projects/libcxx-3.4.2/lib/CMakeFiles/cxx.dir/__/src/string.cpp.o
> In file included from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/algorithm:624,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/string:439,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/src/string.cpp:12:
>
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/type_traits:3280:
> error: expected primary-expression before ‘decltype’
>
/home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/type_traits:3280:
> error: expected ‘;’ before ‘decltype’
> In file included from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/algorithm:626,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/string:439,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/src/string.cpp:12:
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/utility:320:
> error: ‘std::__1::pair<_T1, _T2>::pair(std::__1::pair<_T1,
_T2>&&)’ cannot
> be defaulted
> In file included from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/memory:603,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/algorithm:627,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/string:439,
>                  from
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/src/string.cpp:12:
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx-3.4.2/include/tuple:461:
> error: ‘std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx
...>, _Tp
>
...>::__tuple_impl(std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx
> ...>, _Tp ...>&&)’ cannot be defaulted
> make[2]: ***
> [projects/libcxx-3.4.2/lib/CMakeFiles/cxx.dir/__/src/string.cpp.o] Error 1
> make[1]: *** [projects/libcxx-3.4.2/lib/CMakeFiles/cxx.dir/all] Error 2
> make: *** [all] Error 2
>
>
>
> With Regards
> Srikanth Bemineni
>
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Tim Northover via llvm-dev

2015-Sep-27 02:01 UTC

head link

[llvm-dev] libcxx build error.

On 26 September 2015 at 18:45, Srikanth Bemineni via llvm-dev
<llvm-dev at lists.llvm.org> wrote:> Is libcxx supported on gcc 4.4.7 which comes with CentOS 6.6. Are LLVM
> releases very much constrained to the gcc version specified in the software
> requirements ?
It's probably quite a stretch to say that LLVM 3.4 is still supported
in any sense. We're not going to release another point fix for it, so
you're going to be relying on anyone who happens to have a vague
memory from that era (I don't). As for whether it compiles on CentOS
6, apparently not.

Generally we write to the C++ standard, with hacks reluctantly added
for popular compilers at any given release's time. Releases of CentOS
and RHEL in long-term support are not usually viewed favourably (they
tend to be ridiculously ancient).
> I followed the patch mentioned in this link
> http://comments.gmane.org/gmane.comp.compilers.clang.scm/87139
Thanks for reporting that on the list (honestly), it could be useful
for others coming along after you at least.
> /home/bemineni/llvm/llvm-3.4.2/projects/libcxx/include/tuple:461: error:
> ‘std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx ...>, _Tp
>
...>::__tuple_impl(std::__1::__tuple_impl<std::__1::__tuple_indices<_Indx
> ...>, _Tp ...>&&)’ cannot be defaulted
This looks like something that's not guarded by
_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS (after your patch) but should be.
This one seems fairly easy to fix, but judging by "grep '= default'
|
wc" vs "grep LIBCPP_... | wc" you might be in for a tedious
afternoon
if you want to fix all instances. If you're lucky, GCC 4.4 will
support *most* instances of "= default".

Cheers.

Tim.

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