From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 70E523857C5F; Wed, 24 Mar 2021 11:46:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 70E523857C5F From: "patrick.kox at commandoregel dot be" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/99749] New: Error when using std::string in a module (versions 11.0.1 20210307, 11.0.1 20210314, and 11.0.1 20210321) Date: Wed, 24 Mar 2021 11:46:03 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: patrick.kox at commandoregel dot be X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Mar 2021 11:46:03 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99749 Bug ID: 99749 Summary: Error when using std::string in a module (versions 11.0.1 20210307, 11.0.1 20210314, and 11.0.1 20210321) Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: patrick.kox at commandoregel dot be Target Milestone: --- Created attachment 50468 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50468&action=3Dedit AirlineTicket example code from Professional C++ 5th Edition When trying to compile the "AirlineTicket" example/exercise from the book Professional C++ (5th edition by Marc Gregoire) I'm getting the following e= rror message when I use a std::string in my module. The complete error is: --------------------- In file included from /opt/gcc-11/include/c++/11.0.1/string:55, of module /opt/gcc-11/include/c++/11.0.1/string, imported at AirlineTicket.cpp:3, of module airline_ticket, imported at main.cpp:2: /opt/gcc-11/include/c++/11.0.1/bits/basic_string.h: In function =E2=80=98in= t main()=E2=80=99: /opt/gcc-11/include/c++/11.0.1/bits/basic_string.h:431:7: error: =E2=80=98std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(= ) [with _CharT =3D char; _Traits =3D std::char_traits; _Alloc =3D std::allocator]=E2=80=99 cannot be overloaded with =E2=80=98std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(= ) [with _CharT =3D char; _Traits =3D std::char_traits; _Alloc =3D std::allocator]=E2=80=99 431 | basic_string() | ^~~~~~~~~~~~ In file included from /opt/gcc-11/include/c++/11.0.1/string:55, from /opt/gcc-11/include/c++/11.0.1/bits/locale_classes.h:= 40, from /opt/gcc-11/include/c++/11.0.1/bits/ios_base.h:41, from /opt/gcc-11/include/c++/11.0.1/ios:42, from /opt/gcc-11/include/c++/11.0.1/ostream:38, from /opt/gcc-11/include/c++/11.0.1/iostream:39, of module /opt/gcc-11/include/c++/11.0.1/iostream, imported at main.cpp:1: /opt/gcc-11/include/c++/11.0.1/bits/basic_string.h:431:7: note: previous declaration =E2=80=98std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT =3D char; _Traits =3D std::char_traits= ; _Alloc =3D std::allocator]=E2=80=99 431 | basic_string() | ^~~~~~~~~~~~ In file included from /opt/gcc-11/include/c++/11.0.1/string:55, of module /opt/gcc-11/include/c++/11.0.1/string, imported at AirlineTicket.cpp:3, of module airline_ticket, imported at main.cpp:2: /opt/gcc-11/include/c++/11.0.1/bits/basic_string.h:431:7: error: =E2=80=98std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(= ) [with _CharT =3D char; _Traits =3D std::char_traits; _Alloc =3D std::allocator]=E2=80=99 cannot be overloaded with =E2=80=98std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(= ) [with _CharT =3D char; _Traits =3D std::char_traits; _Alloc =3D std::allocator]=E2=80=99 431 | basic_string() | ^~~~~~~~~~~~ In file included from /opt/gcc-11/include/c++/11.0.1/string:55, from /opt/gcc-11/include/c++/11.0.1/bits/locale_classes.h:= 40, from /opt/gcc-11/include/c++/11.0.1/bits/ios_base.h:41, from /opt/gcc-11/include/c++/11.0.1/ios:42, from /opt/gcc-11/include/c++/11.0.1/ostream:38, from /opt/gcc-11/include/c++/11.0.1/iostream:39, of module /opt/gcc-11/include/c++/11.0.1/iostream, imported at main.cpp:1: /opt/gcc-11/include/c++/11.0.1/bits/basic_string.h:431:7: note: previous declaration =E2=80=98std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT =3D char; _Traits =3D std::char_traits= ; _Alloc =3D std::allocator]=E2=80=99 431 | basic_string() | ^~~~~~~~~~~~ main.cpp:6:9: note: during load of binding =E2=80=98::AirlineTicket@airline= _ticket=E2=80=99 6 | AirlineTicket myTicket; | ^~~~~~~~~~~~~ make: *** [Makefile:76: debug] Error 1 --------------------- The code that I'm using is: --------------------- export module airline_ticket; import; export class AirlineTicket{ public: AirlineTicket(); ~AirlineTicket(); double calculatePriceInDollars()const; std::string getPassengerName()const; void setPassengerName(std::string name); int getNumberOfMiles() const; void setNumberOfMiles(int miles); bool hasEliteSuperRewardsStatus() const; void setHasEliteSuperRecardsStatus(bool status); private: std::string m_passengerName{}; int m_numberOfMiles{}; bool m_hasEliteSuperRewardsStatus{}; }; AirlineTicket::AirlineTicket() : m_passengerName{"Unknown Passenger"}, m_numberOfMiles{0},m_hasEliteSuperRewardsStatus{false}{} AirlineTicket::~AirlineTicket() {} double AirlineTicket::calculatePriceInDollars() const { if (hasEliteSuperRewardsStatus()) { // Elite Super Rewards Customers fly for free. return 0;=20=20=20=20=20=20=20 } // The cost of a ticket is the number of miles times 0.1. // Real airlines probably have a more complicated // formula! return getNumberOfMiles() * 0.1; } std::string AirlineTicket::getPassengerName()const { return m_passengerName; } void AirlineTicket::setPassengerName(std::string name) { m_passengerName =3D name; } void AirlineTicket::setPassengerInitial(char initial) { m_passengerInitial =3D initial; } int AirlineTicket::getNumberOfMiles() const { return m_numberOfMiles; } void AirlineTicket::setNumberOfMiles(int miles) { m_numberOfMiles =3D miles; } bool AirlineTicket::hasEliteSuperRewardsStatus() const { return m_hasEliteSuperRewardsStatus; } void AirlineTicket::setHasEliteSuperRecardsStatus(bool status) { m_hasEliteSuperRewardsStatus =3D status; } --------------------- When I remove the string from the code, it compiles without problem, also w= hen I use a string in main() there is no error. Also the following 2 compile commands run without problem: g++ -Wall -Wextra -fmodules-ts -std=3Dgnu++20 -pedantic -c -x c++-system-h= eader iostream string and g++ -Wall -Wextra -fmodules-ts -std=3Dgnu++20 -pedantic -c AirlineTicket.cpp I've attached a tarball with the AirlineTicket.cpp and main.cpp files=