<div dir="ltr">Are you trying to compile `libc++abi` as well?</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 27, 2018 at 11:18 AM, Shoaib Meenai via cfe-dev <span dir="ltr"><<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">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.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">cfe-dev <<a href="mailto:cfe-dev-bounces@lists.llvm.org" target="_blank">cfe-dev-bounces@lists.llvm.<wbr>org</a>> on behalf of cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>><br>
<b>Reply-To: </b>Csaba Raduly <<a href="mailto:rcsaba@gmail.com" target="_blank">rcsaba@gmail.com</a>><br>
<b>Date: </b>Friday, April 27, 2018 at 7:09 AM<br>
<b>To: </b>cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>><br>
<b>Subject: </b>[cfe-dev] libc++ fails to link<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-left:.5in"><a name="m_8675053745185393112__MailOriginalBody">Hi all,<u></u><u></u></a></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>I have LLVM + clang + clang extra tools + compiler-rt + libc++ checked<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>out as suggested by
</span><a href="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=" target="_blank"><span>https://urldefense.proofpoint.<wbr>com/v2/url?u=https-3A__clang.<wbr>llvm.org_get-5Fstarted.html&d=<wbr>DwIBaQ&c=<wbr>5VD0RTtNlTh3ycd41b3MUw&r=<wbr>o3kDXzdBUE3ljQXKeTWOMw&m=<wbr>h1o5qmlDkLVbiL5yi4QdDFvsAnb-<wbr>Mcm-C6ZFQyqk-1o&s=<wbr>IddzUvTcPKuDha4YLYwQ3NXE1tC-<wbr>3h0oBw1mcNstI5E&e=</span><span></span></a><span><u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>After configuring with<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>cmake -G Ninja \<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><span class="m_8675053745185393112apple-tab-span">
</span></span><span>-DCMAKE_BUILD_TYPE=Release \<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><span class="m_8675053745185393112apple-tab-span">
</span></span><span>-DCMAKE_C_COMPILER=gcc \<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><span class="m_8675053745185393112apple-tab-span">
</span></span><span>-DCMAKE_CXX_COMPILER=g++ \<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><span class="m_8675053745185393112apple-tab-span">
</span></span><span>-DLLVM_INCLUDE_GO_TESTS=OFF \<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><span class="m_8675053745185393112apple-tab-span">
</span></span><span>-DLLVM_TARGETS_TO_BUILD=X86 \<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><span class="m_8675053745185393112apple-tab-span">
</span></span><span>../llvm<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>and running "ninja all check-all" , I get a bunch of errors like:<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>projects/libcxx/lib/<wbr>CMakeFiles/cxx_objects.dir/__/<wbr>src/locale.cpp.o: In<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>function `std::__1::(anonymous<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>namespace)::__throw_runtime_<wbr>error(std::__1::basic_string<<wbr>char,<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>std::__1::char_traits<char>, std::__1::allocator<char> > const&)':<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>locale.cpp:(.text.unlikely._<wbr>ZNSt3__112_GLOBAL__N_1L21__<wbr>throw_runtime_errorERKNS_<wbr>12basic_stringIcNS_11char_<wbr>traitsIcEENS_9allocatorIcEEEE+<wbr>0xf):<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>undefined reference to `__cxa_allocate_exception'<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>locale.cpp:(.text.unlikely._<wbr>ZNSt3__112_GLOBAL__N_1L21__<wbr>throw_runtime_errorERKNS_<wbr>12basic_stringIcNS_11char_<wbr>traitsIcEENS_9allocatorIcEEEE+<wbr>0x33):<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>undefined reference to `__cxa_throw'<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>locale.cpp:(.text.unlikely._<wbr>ZNSt3__112_GLOBAL__N_1L21__<wbr>throw_runtime_errorERKNS_<wbr>12basic_stringIcNS_11char_<wbr>traitsIcEENS_9allocatorIcEEEE+<wbr>0x3e):<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>undefined reference to `__cxa_free_exception'<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>projects/libcxx/lib/<wbr>CMakeFiles/cxx_objects.dir/__/<wbr>src/locale.cpp.o: In<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>function `std::__1::ctype_byname<wchar_<wbr>t>::do_widen(char) const':<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>locale.cpp:(.text._ZNKSt3__<wbr>112ctype_bynameIwE8do_widenEc+<wbr>0x43):<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>undefined reference to `__cxa_call_unexpected'<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>(see the attachment)<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>This used to work 2-3 months ago ; the build would finish with the<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>unittests (of which five used to fail ; one got fixed since then).<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>Platform: Ubuntu 17.10<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3.2)<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>Csaba<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>--
<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>You can get very substantial performance improvements by not doing the<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>right thing.<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span> - Scott Meyers, An Effective C++11/14 Sampler<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>So if you're looking for a completely portable, 100% standards-conformat way<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>to get the wrong information: this is what you want. - Scott Meyers<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span>(C++TDaWYK)<u></u><u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span><u></u> <u></u></span></p>
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