digitalmars.D.learn - Linking objects built with MingW on windows
I tried linking an object built with MingW with the command ``` g++ -c libs/webview/webview.cc --std=c++14 -Ilibs/webview2 -DWEBVIEW_STATIC -mwindows -static-libgcc -static-libstdc++ -o webview.o ``` In my source root dir, I tried: ``` dmd app.d .\webview.d .\webview.o advapi32.lib ole32.lib shell32.lib shlwapi.lib user32.lib version.lib -extern-std=c++14 ``` But most of the errors I get (from lld-link.exe) seem to stem from undefined symbols from c++11: ``` lld-link: error: undefined symbol: _ZTVN10__cxxabiv117__class_type_infoElld-link: error: undefined symbol: _ZTVN10__cxxabiv120__si_class_type_infoEreferenced by .\webview.obj:(_ZTIZZ12webview_bindENKUlvE_clEvEUlRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES7_PvE_) referenced by .\webview.obj:(_ZTIZZ16webview_dispatchENKUlvE_clEvEUlvE_) referenced by .\webview.obj:(_ZTIZN7webview6detail11engine_base10on_messageERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEUlvE_) referenced by .\webview.obj:(_ZTIZN7webview6detail11engine_base28deplete_run_loop_event_queueEvEUlvE_) referenced by .\webview.obj:(_ZTIZN7webview6detail11engine_base28deplete_run_loop_event_queueEvEUlvE0_) referenced by .\webview.obj:(_ZTIZN7webview6detail11engine_base21dispatch_size_defaultEvEUlvE_) referenced by .\webview.obj:(_ZTIZN7webview6detail17win32_edge_engine20add_user_script_implERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEUllPKwE_) referenced by .\webview.obj:(_ZTIZN7webview6detail17win32_edge_engine20add_user_script_implERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEUlvE_) referenced by .\webview.obj:(_ZTIZN7webview6detail17win32_edge_engine20add_user_script_implERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEUlPNS0_11user_script4implEE_) referenced by .\webview.obj:(_ZTIZN7webview6detail17win32_edge_engine5embedEP6HWND__bSt8functionIFvNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEEEUlP23ICoreWebView2ControllerP13ICoreWebView2E_) referenced 7 more timesand much much more ... ``` ... and also from ldc2: ``` lld-link: error: undefined symbol: vtable for __cxxabiv1::__class_type_inforeferenced by .\webview.obj:(_ZTIN7webview9exceptionE) referenced by .\webview.obj:(_ZTISt5_BindIFZN7webview6detail11engine_base7resolveERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEiSA_EUlS8_E_S8_EE) referenced by .\webview.obj:(_ZTISt5_BindIFMN7webview6detail11engine_baseEFvRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEPNS1_17win32_edge_engineESt12_PlaceholderILi1EEEE) referenced by .\webview.obj:(_ZTIN7webview6detail10bad_accessE) referenced by .\webview.obj:(_ZTIN7webview6detail17win32_edge_engineE) referenced by .\webview.obj:(_ZTIN7webview6detail34webview2_user_script_added_handlerE) referenced by .\webview.obj:(_ZTI57ICoreWebView2CreateCoreWebView2ControllerCompletedHandler) referenced by .\webview.obj:(_ZTI58ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler) referenced by .\webview.obj:(_ZTI64ICoreWebView2AddScriptToExecuteOnDocumentCreatedCompletedHandler) referenced by .\webview.obj:(_ZTI43ICoreWebView2WebMessageReceivedEventHandler) referenced 5 more timeslld-link: error: undefined symbol: vtable for __cxxabiv1::__si_class_type_inforeferenced by .\webview.obj:(typeinfo for webview_bind::'lambda'()::operator()() const::'lambda'(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, void*)) referenced by .\webview.obj:(typeinfo for webview_dispatch::'lambda'()::operator()() const::'lambda'()) referenced by .\webview.obj:(typeinfo for webview::detail::engine_base::on_message(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&)::'lambda'()) referenced 14 more times... ``` I've tried changing extern-std to c++11 but it also fails. I've also tried linking with libstd++ from my local MingW installation but I get something along the lines of ``` duplicate symbol: ___xxx___xxxxx libstdc++ ``` Building the g++ as a standalone exe with the libs `advapi32.lib ole32.lib shell32.lib shlwapi.lib user32.lib version.lib` and `--std=c++14` produces an exe that works as expected. I'm probably doing the linking wrong.referenced by .\webview.obj:(typeinfo for webview::exception) referenced by .\webview.obj:(typeinfo for std::_Bind<webview::detail::engine_base::resolve(std::__cxx11 :basic_string<char, std::char_traits<char>, std::allocator<char>> const&, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&)::'lambda'(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>) (std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>)>) referenced by .\webview.obj:(typeinfo for std::_Bind<void (webview::detail::engine_base::* (webview::detail::win32_edge_engine*, std::_Placeholder<1>))(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&)>) referenced 12 more times
Apr 10
MinGW isn't supported by DMD and LDC. If you can't use an MS Visual C++ toolchain to build that webview.obj (and all libs it depends on), you could give GDC a try.
Apr 10
ronnie-w <mymail mail.com> On Thursday, 10 April 2025 at 13:44:19 UTC, kinke wrote:MinGW isn't supported by DMD and LDC. If you can't use an MS Visual C++ toolchain to build that webview.obj (and all libs it depends on), you could give GDC a try.This question was actually dumb, dmd and ldc do support MingW: I should have created a .lib file instead of using the object file directly: `g++ -c libs/webview/webview.cc -std=c++14 -Ilibs/webview2 -static-libstdc++ -static-libgcc -DWEBVIEW_STATIC -o webview.o` `ar r webview.lib webview.o` ... and used that with dmd/ldc instead. For the duplicate symbols in ldc adding the flag `--mscrtlib=<libcmt[d]|msvcrt[d]>` worked.
Apr 12