[cfe-dev] libc++ fails to link

[Eric Fiselier via cfe-dev]

Are you trying to compile `libc++abi` as well?

On Fri, Apr 27, 2018 at 11:18 AM, Shoaib Meenai via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> The easiest way to fix this would be to also check out libc++abi. An
> alternative would be to configure libc++ to use an alternative ABI library
> (either -DLIBCXX_CXX_ABI=libstdc++ or -DLIBCXX_CXX_ABI=libsupc++ ought to
> work), but I think libc++abi is the simplest route to go.
>
>
>
> *From: *cfe-dev <cfe-dev-bounces at lists.llvm.org> on behalf of cfe-dev <
> cfe-dev at lists.llvm.org>
> *Reply-To: *Csaba Raduly <rcsaba at gmail.com>
> *Date: *Friday, April 27, 2018 at 7:09 AM
> *To: *cfe-dev <cfe-dev at lists.llvm.org>
> *Subject: *[cfe-dev] libc++ fails to link
>
>
>
> Hi all,
>
>
>
> I have LLVM + clang + clang extra tools + compiler-rt + libc++ checked
>
> out as suggested by https://urldefense.proofpoint.
> com/v2/url?u=https-3A__clang.llvm.org_get-5Fstarted.html&d=DwIBaQ&c=
> 5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=
> h1o5qmlDkLVbiL5yi4QdDFvsAnb-Mcm-C6ZFQyqk-1o&s=IddzUvTcPKuDha4YLYwQ3NXE1tC-
> 3h0oBw1mcNstI5E&e=
>
>
>
> After configuring with
>
>
>
> cmake -G Ninja \
>
>                 -DCMAKE_BUILD_TYPE=Release \
>
>                 -DCMAKE_C_COMPILER=gcc \
>
>                 -DCMAKE_CXX_COMPILER=g++ \
>
>                 -DLLVM_INCLUDE_GO_TESTS=OFF \
>
>                 -DLLVM_TARGETS_TO_BUILD=X86 \
>
>                 ../llvm
>
>
>
> and running "ninja all check-all" , I get a bunch of errors like:
>
>
>
> projects/libcxx/lib/CMakeFiles/cxx_objects.dir/__/src/locale.cpp.o: In
>
> function `std::__1::(anonymous
>
> namespace)::__throw_runtime_error(std::__1::basic_string<char,
>
> std::__1::char_traits<char>, std::__1::allocator<char> > const&)':
>
> locale.cpp:(.text.unlikely._ZNSt3__112_GLOBAL__N_1L21__
> throw_runtime_errorERKNS_12basic_stringIcNS_11char_
> traitsIcEENS_9allocatorIcEEEE+0xf):
>
> undefined reference to `__cxa_allocate_exception'
>
> locale.cpp:(.text.unlikely._ZNSt3__112_GLOBAL__N_1L21__
> throw_runtime_errorERKNS_12basic_stringIcNS_11char_
> traitsIcEENS_9allocatorIcEEEE+0x33):
>
> undefined reference to `__cxa_throw'
>
> locale.cpp:(.text.unlikely._ZNSt3__112_GLOBAL__N_1L21__
> throw_runtime_errorERKNS_12basic_stringIcNS_11char_
> traitsIcEENS_9allocatorIcEEEE+0x3e):
>
> undefined reference to `__cxa_free_exception'
>
> projects/libcxx/lib/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'
>
>
>
> (see the attachment)
>
>
>
> This used to work 2-3 months ago ; the build would finish with the
>
> unittests (of which five used to fail ; one got fixed since then).
>
>
>
> Platform: Ubuntu 17.10
>
> gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3.2)
>
>
>
>
>
> Csaba
>
> --
>
> You can get very substantial performance improvements by not doing the
>
> right thing.
>
>    - Scott Meyers, An Effective C++11/14 Sampler
>
> So if you're looking for a completely portable, 100% standards-conformat
> way
>
> to get the wrong information: this is what you want. - Scott Meyers
>
> (C++TDaWYK)
>
>
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>
>
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