Those are Clang bugs [0]. Multiple definitions error has been fixed in [1] and probably (just guessing) made it to Clang 6.0.0 release.
Undefined references bug happens when you link code compiled by Clang to static libstdc++ (and probably other static libs too) compiled by GCC. I think there is still no solution for this one. [0] https://lists.llvm.org/pipermail/cfe-dev/2017-April/053530.html [1] https://reviews.llvm.org/D33620 śr., 2 maj 2018 o 18:16 Sukhbir Singh <yamailingl...@riseup.net> napisał(a): > Hi, > > I have a question about C++ ABI compatibility (or lack thereof) between > mingw-w64 and clang. > > I am trying to cross-compile go-webrtc > [https://github.com/keroserene/go-webrtc] with mingw-w64 (cgo), which has > webrtc as its dependency (compiled with clang). I am running into errors > during the linking stage: > > /var/tmp/dist/mingw-w64/x86_64-w64-mingw32/include/malloc.h:183:0: > note: this is the location of the previous definition > #define alloca(x) __builtin_alloca((x)) > ^ > # github.com/keroserene/go-webrtc > > /var/tmp/dist/mingw-w64/lib/gcc/x86_64-w64-mingw32/5.4.0/../../../../x86_64-w64-mingw32/lib/../lib/libstdc++.a(cow-stdexcept.o): > In function `std::string::_M_data() const': > > /var/tmp/build/gcc/x86_64-w64-mingw32/libstdc++-v3/src/c++11/../../../../gcc-5.4.0/libstdc++-v3/src/c++11/cow-stdexcept.cc:44: > multiple definition of `std::logic_error::logic_error(std::logic_error > const&)' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/peerconnection.cc.o:peerconnection.cc:(.text$_ZNSt11logic_errorC2ERKS_[_ZNSt11logic_errorC2ERKS_]+0x0) > <http://github.com/keroserene/go-webrtc/_obj/peerconnection.cc.o:peerconnection.cc:(.text$_ZNSt11logic_errorC2ERKS_%5B_ZNSt11logic_errorC2ERKS_%5D+0x0)>: > first defined here > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x5a9): > undefined reference to `cricket::AudioCodec::ToString() const' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x6de): > undefined reference to `webrtc::RtpExtension::ToString() const' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x813): > undefined reference to `cricket::DataCodec::ToString() const' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x8f5): > undefined reference to `rtc::FatalMessage::FatalMessage(char const*, int)' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x96a): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xa1b): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xbf8): > undefined reference to `rtc::FatalMessage::FatalMessage(char const*, int)' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xc6d): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xd20): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xdb1): > undefined reference to `rtc::FatalMessage::FatalMessage(char const*, int)' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xe26): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xed5): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xf6d): > undefined reference to `rtc::FatalMessage::FatalMessage(char const*, int)' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0xfe2): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x1094): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x112c): > undefined reference to `rtc::FatalMessage::FatalMessage(char const*, int)' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x11a1): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > /tmp/go-build868110800/ > github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o:ctestenums.cc:(.text+0x1254): > undefined reference to `rtc::FatalMessage::~FatalMessage()' > > /var/tmp/dist/mingw-w64/lib/gcc/x86_64-w64-mingw32/5.4.0/../../../../x86_64-w64-mingw32/bin/ld: > $WORK/github.com/keroserene/go-webrtc/_obj/ctestenums.cc.o: bad reloc > address 0xc0 in section `.rdata' > collect2: error: ld returned 1 exit status > > The webrtc library has the missing symbols and so I was wondering if this > error stems from incompatibility between mingw-w64 and clang, and if yes, > what's the possible fix for it? > > -- > Sukhbir > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Mingw-w64-public mailing list > Mingw-w64-public@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mingw-w64-public > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
