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From: "nickbegg at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/114229] New: [modules] duplicate symbols when including stl in submodule Date: Mon, 04 Mar 2024 16:42:58 +0000 [thread overview] Message-ID: <bug-114229-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114229 Bug ID: 114229 Summary: [modules] duplicate symbols when including stl in submodule Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: nickbegg at gmail dot com Target Milestone: --- using the same test src code as PR113930 - // submod.mpp module; #include <iostream> export module modA:submod; // modA.mpp module; export module modA; export import :submod; // main.cpp #include <string> import modA; std::string test_func() { return ""; } Note that this test code causes #113930 to check in a GCC debug build. With a GCC release build, at link time numerous STL symbols become duplicated - % /home/nick/inst/gcc-trunk-release/bin/g++ -freport-bug -g CMakeFiles/moduleMin.dir/main.cpp.o CMakeFiles/moduleMin.dir/submod.mpp.o CMakeFiles/moduleMin.dir/modA.mpp.o -o moduleMin /usr/bin/ld: CMakeFiles/moduleMin.dir/modA.mpp.o:(.rodata+0x40): multiple definition of `vtable for std::basic_ios<wchar_t, std::char_traits<wchar_t> >'; CMakeFiles/moduleMin.dir/main.cpp.o:(.rodata+0x950): first defined here /usr/bin/ld: CMakeFiles/moduleMin.dir/modA.mpp.o:(.rodata+0x60): multiple definition of `vtable for std::basic_ostream<wchar_t, std::char_traits<wchar_t> >'; CMakeFiles/moduleMin.dir/main.cpp.o:(.rodata+0x8f0): first defined here /usr/bin/ld: CMakeFiles/moduleMin.dir/modA.mpp.o:(.rodata+0xb0): multiple definition of `VTT for std::basic_ostream<wchar_t, std::char_traits<wchar_t> >'; CMakeFiles/moduleMin.dir/main.cpp.o:(.rodata+0x940): first defined here /usr/bin/ld: CMakeFiles/moduleMin.dir/modA.mpp.o:(.rodata+0xc0): multiple definition of `vtable for std::basic_istream<wchar_t, std::char_traits<wchar_t> >'; CMakeFiles/moduleMin.dir/main.cpp.o:(.rodata+0x740): first defined here [snip] Note that #including <iostream> in both places (rather than string in main.cpp) resolves the issue - Is the include guard mechanism failing?
next reply other threads:[~2024-03-04 16:43 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-03-04 16:42 nickbegg at gmail dot com [this message] 2024-03-04 16:48 ` [Bug c++/114229] " nickbegg at gmail dot com 2024-03-05 19:52 ` ppalka at gcc dot gnu.org 2024-03-05 20:25 ` [Bug c++/114229] [modules] duplicate vtable " ppalka at gcc dot gnu.org 2024-03-07 22:02 ` cvs-commit at gcc dot gnu.org 2024-03-07 22:05 ` nshead at gcc dot gnu.org 2024-03-07 23:04 ` nickbegg at gmail dot com 2024-03-08 15:49 ` ppalka at gcc dot gnu.org
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