"Dual" refers to libstdc++ here, i.e. you only have one standard library
supporting both abi's.
Other libraries generally are only one or the other, this is what is
controlled by the -D_GLIBCXX_USE_CXX11_ABI; Theoretically you could make
your own dual-abi library but you'd have to plaster
__attribute__((abi_tag("cxx11"))) everywhere, so hell no.
What I'm saying is: if you provide the same value for
-D_GLIBCXX_USE_CXX11_ABI as what was used for the system givaro then you
should be able to link them together.
On Monday, May 10, 2021 at 2:27:44 PM UTC+2 dim...@gmail.com wrote:
> On Sunday, May 9, 2021 at 11:24:23 AM UTC+1 Volker Braun wrote:
>
>> This is c++11 dual abi, see
>> https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html
>>
>> IMHO we just shouldn't use the system version then, but building Sage
>> with -D_GLIBCXX_USE_CXX11_ABI=0 should allow you to link with old-style abi
>> libraries.
>>
>> The default value of _GLIBCXX_USE_CXX11_ABI can be changed by the distro,
>> which is probably what accounts for the differences seen in this thread.
>>
>
> Are you saying it's a bug in Fedora 32, they should have provided dual
> ABI, like Gentoo does, but they don't?
> Or that they provide an old-style ABI, and we can use `
> -D_GLIBCXX_USE_CXX11_ABI=0` to make this work for Sage?
> Isn't c++11 "old" nowadays?
>
> I tried to write a short C++ code do produce this error, so that we can
> put it into our gcc/spkg-configure.m4, but I cannot
> figure it out.
>
>
>
>
>>
>>
>> On Saturday, May 8, 2021 at 7:01:13 PM UTC+2 Steven Trogdon wrote:
>>
>>> Building Givaro on Gentoo I have
>>>
>>> CXXFLAGS=-O2 -pipe -march=native -O2 -pipe -fabi-version=6 -msse
>>> -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mavx
>>>
>>> Your Redhat has
>>>
>>> CXXFLAGS=-O2 -g -pipe -Wall -Werror=format-security
>>> -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions
>>> -fstack-protector-strong -grecord-gcc-switches
>>> -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
>>> -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
>>> -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
>>>
>>> Could the abi-version=6 be the issue?
>>>
>>> On Saturday, May 8, 2021 at 6:01:02 AM UTC-6 dim...@gmail.com wrote:
>>>
>>>> one has
>>>> https://kojipkgs.fedoraproject.org//packages/givaro/4.1.1/1.fc32/data/logs/x86_64/build.log
>>>> and other logs there
>>>>
>>>> On Saturday, May 8, 2021 at 12:45:07 PM UTC+1 Dima Pasechnik wrote:
>>>>
>>>>> On Saturday, May 8, 2021 at 12:34:11 PM UTC+1 François Bissey wrote:
>>>>>
>>>>>> What compiler and flags have used to compile fedora 32 givaro? Can we
>>>>>> easily find out?
>>>>>
>>>>>
>>>>> the compiler used to build Sage is g++ 10.2.1
>>>>>
>>>>> $ g++ -v
>>>>> Using built-in specs.
>>>>> COLLECT_GCC=/usr/bin/g++
>>>>> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper
>>>>> OFFLOAD_TARGET_NAMES=nvptx-none
>>>>> OFFLOAD_TARGET_DEFAULT=1
>>>>> Target: x86_64-redhat-linux
>>>>> Configured with: ../configure --enable-bootstrap
>>>>> --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr
>>>>> --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=
>>>>> http://bugzilla.redhat.com/bugzilla --enable-shared
>>>>> --enable-threads=posix --enable-checking=release --enable-multilib
>>>>> --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
>>>>> --enable-gnu-unique-object --enable-linker-build-id
>>>>> --with-gcc-major-version-only --with-linker-hash-style=gnu
>>>>> --enable-plugin
>>>>> --enable-initfini-array --with-isl --enable-offload-targets=nvptx-none
>>>>> --without-cuda-driver --enable-gnu-indirect-function --enable-cet
>>>>> --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
>>>>> Thread model: posix
>>>>> Supported LTO compression algorithms: zlib zstd
>>>>> gcc version 10.2.1 20201125 (Red Hat 10.2.1-9) (GCC)
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>>
>>>>>> > On 8/05/2021, at 23:31, Dima Pasechnik <dim...@gmail.com> wrote:
>>>>>> >
>>>>>> > With system Givaro, one gets
>>>>>> >
>>>>>> > [dochtml] ImportError:
>>>>>> /home/scratch2/dimpase/sage/sage/local/lib64/python3.8/site-packages/sage/matrix/
>>>>>> matrix_modn_sparse.cpython-38-x86_64-linux-gnu.so: undefined symbol:
>>>>>> _ZNK6Givaro7IntegercvNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEB5cxx11Ev
>>>>>>
>>>>>>
>>>>>> > make[3]: *** [Makefile:2280: doc-html] Error 1
>>>>>> >
>>>>>> > which demangled says
>>>>>> >
>>>>>> > $ c++filt
>>>>>> _ZNK6Givaro7IntegercvNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEB5cxx11Ev
>>>>>>
>>>>>>
>>>>>> > Givaro::Integer::operator std::__cxx11::basic_string<char,
>>>>>> std::char_traits<char>, std::allocator<char> >[abi:cxx11]() const
>>>>>> >
>>>>>> > The system library has Givaro::Integer::operator
>>>>>> std::__cxx11::basic_string<char, std::char_traits<char>,
>>>>>> std::allocator<char> >() const
>>>>>> >
>>>>>> > (no of that weird [abi:cxx11] qualifier)
>>>>>> >
>>>>>> > Any ideas how to fix this? (besides not using system Givaro) ?
>>>>>> >
>>>>>> > Dima
>>>>>> >
>>>>>> > --
>>>>>> > You received this message because you are subscribed to the Google
>>>>>> Groups "sage-devel" group.
>>>>>> > To unsubscribe from this group and stop receiving emails from it,
>>>>>> send an email to sage-devel+...@googlegroups.com.
>>>>>> > To view this discussion on the web visit
>>>>>> https://groups.google.com/d/msgid/sage-devel/b187faf3-50c4-42c4-ae37-77c5a3902bbcn%40googlegroups.com.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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