[cfe-dev] Troubles building libcxx from svn source

Wed Oct 11 10:07:54 PDT 2017

After digging through makefiles, the issue is that on a new Linux install
there is only libstdc++, and the CMakeLists file was sticking
-nodefaultlibs in the link instructions.

So no c++ abi was present as you pointed out Jon (and that you for taking
the time to respond, I appreciate it!)

Adding -DLIBCXX_CXX_ABI=libstdc++ to the top-level cmake invocation seems
to have fixed the problem; I'm building now so we'll see.

On Wed, Oct 11, 2017 at 12:53 PM, Jonathan Roelofs <
jonathan at codesourcery.com> wrote:

>
>
> On 10/11/17 7:36 AM, Derrick Johnson via cfe-dev wrote:
>
>> up vote0down votefavorite <https://stackoverflow.com/que
>> stions/46687323/linker-errors-building-libcxx-on-fresh-ubuntu-install#>
>> <https://stackoverflow.com/questions/46687323/linker-errors-
>> building-libcxx-on-fresh-ubuntu-install#>
>>
>>
>> The directions I followed are here: https://clang.llvm.org/get_sta
>> rted.html (steps 1-7, including the optional ones).
>>
>> I was very careful to type everything EXACTLY as specified (so all
>> projects are in the correct directories).
>>
>> After I ran 'cmake', everything looked fine, no error messages.
>>
>> But when I try to build with 'make', when it gets to libcxx it has linker
>> errors:
>>
>> |. . . [100%] Built target cxx_objects [100%] Linking CXX shared library
>> ../../../lib/libc++.so CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o:
>> In function `std::__1::(anonymous namespace)::__throw_runtime_er
>> ror(std::__1::basic_string<char, std::__1::char_traits<char>,
>> std::__1::allocator<char> > const&)': locale.cpp:(.text.unlikely._ZN
>> St3__112_GLOBAL__N_1L21__throw_runtime_errorERKNS_12basic_
>> stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+0xf): undefined
>> reference to `__cxa_allocate_exception' locale.cpp:(.text.unlikely._ZN
>> St3__112_GLOBAL__N_1L21__throw_runtime_errorERKNS_12basic_
>> stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+0x33): undefined
>> reference to `__cxa_throw' locale.cpp:(.text.unlikely._ZN
>> St3__112_GLOBAL__N_1L21__throw_runtime_errorERKNS_12basic_
>> stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE+0x3e): undefined
>> reference to `__cxa_free_exception' CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o:
>> In function `std::__1::ctype_byname<wchar_t>::do_widen(char) const':
>> locale.cpp:(.text._ZNKSt3__112ctype_bynameIwE8do_widenEc+0x43):
>> undefined reference to `__cxa_call_unexpected'
>> CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o: In function
>> `std::__1::ctype_byname<wchar_t>::do_widen(char const*, char const*,
>> wchar_t*) const': locale.cpp:(.text._ZNKSt3__112
>> ctype_bynameIwE8do_widenEPKcS3_Pw+0x7a): undefined reference to
>> `__cxa_call_unexpected' CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o:
>> In function `std::__1::ctype_byname<wchar_t>::do_narrow(wchar_t, char)
>> const': locale.cpp:(.text._ZNKSt3__112ctype_bynameIwE9do_narrowEwc+0x46):
>> undefined reference to `__cxa_call_unexpected'
>> CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o: In function
>> `std::__1::ctype_byname<wchar_t>::do_narrow(wchar_t const*, wchar_t
>> const*, char, char*) const': locale.cpp:(.text._ZNKSt3__112
>> ctype_bynameIwE9do_narrowEPKwS3_cPc+0x8d): undefined reference to
>> `__cxa_call_unexpected' CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o:
>> In function `std::__1::locale::__imp::use_facet(long) const [clone
>> .part.18]': locale.cpp:(.text.unlikely._ZNKSt3__16locale5__imp9use_facetEl.part.18+0x7):
>> undefined reference to `__cxa_allocate_exception'
>> locale.cpp:(.text.unlikely._ZNKSt3__16locale5__imp9use_facetEl.part.18+0x28):
>> undefined reference to `__cxa_throw' CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o:
>> In function `std::__1::__time_get_c_storage<char>::__weeks() const':
>> locale.cpp:(.text._ZNKSt3__120__time_get_c_storageIcE7__weeksEv+0x21):
>> undefined reference to `__cxa_guard_acquire' locale.cpp:(.text._ZNKSt3__120
>> __time_get_c_storageIcE7__weeksEv+0x167): undefined reference to
>> `__cxa_guard_release' locale.cpp:(.text._ZNKSt3__120
>> __time_get_c_storageIcE7__weeksEv+0x178): undefined reference to
>> `__cxa_guard_acquire' locale.cpp:(.text._ZNKSt3__120
>> __time_get_c_storageIcE7__weeksEv+0x35a): undefined reference to
>> `__cxa_guard_release' locale.cpp:(.text._ZNKSt3__120
>> __time_get_c_storageIcE7__weeksEv+0x383): undefined reference to
>> `__cxa_guard_abort' . . . |'
>>
>
> These missing symbols are things from the c++ abi library, i.e. either
> libcxxabi, libcxxrt, or libsupc++, depending on your platform.
>
>
> Jon
>
>
>> Fresh Ubuntu 17.04 install (X86) with the preinstalled gcc being used to
>> build.
>>
>> (neither clang nor libc++ are present in the default 17.04 release).
>>
>>
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>>
> --
> Jon Roelofs
> jonathan at codesourcery.com
> CodeSourcery / Mentor Embedded / Siemens
>

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