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From: "m.cencora at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114868] New: [modules] func declared in GMF and exported
 via using-decl in module partition is not actually exported
Date: Fri, 26 Apr 2024 19:19:54 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: m.cencora at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114868

            Bug ID: 114868
           Summary: [modules] func declared in GMF and exported via
                    using-decl in module partition is not actually
                    exported
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: m.cencora at gmail dot com
  Target Milestone: ---

$ cat mod.cpp=20
export module mod;
export import :part;

export void foo()
{
}

$ cat mod-part.cpp=20
module;

#include "bar.hpp"

export module mod:part;

export using ::bar;

export void bar_non_gmf()
{
}

$ cat usage.cpp=20
import mod;

int main()
{
    foo();
    bar();
    bar_non_gmf();
}

$ g++ -std=3Dc++2b -fmodules-ts mod-part.cpp mod.cpp usage.cpp
usage.cpp: In function =E2=80=98int main()=E2=80=99:
usage.cpp:6:5: error: =E2=80=98bar=E2=80=99 was not declared in this scope
    6 |     bar();
      |     ^~~

When I compile mod-part.cpp on its own, it seems that bar symbol is not emi=
tted
in the object file:
$ g++ -std=3Dc++2b -fmodules-ts mod-part.cpp -c -o mod-part.o
$ readelf -s mod-part.o | c++filt

Symbol table '.symtab' contains 5 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT  UND=20
     1: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS mod-part.cpp
     2: 0000000000000000     0 SECTION LOCAL  DEFAULT    1 .text
     3: 0000000000000000    11 FUNC    GLOBAL DEFAULT    1 bar_non_gmf@mod()
     4: 000000000000000b    11 FUNC    GLOBAL DEFAULT    1 initializer for
module mod:part=