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From: "michael.kenzel at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113580] New: -Wunused-parameter in template imported from
 module causes segmentation fault
Date: Wed, 24 Jan 2024 11:57:26 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: michael.kenzel at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113580

            Bug ID: 113580
           Summary: -Wunused-parameter in template imported from module
                    causes segmentation fault
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: michael.kenzel at gmail dot com
  Target Milestone: ---

The following example will reproduce the issue:

        // A.ixx
        export module A;

        export void fun(auto&& x) {}

        // main.cpp
        import A;

        int main()
        {
                fun(42);
        }


g++ -std=3Dc++23 -fmodules-ts -c -x c++ A.ixx
g++ -std=3Dc++23 -Wunused-parameter -fmodules-ts main.cpp A.o=20

results in

Segmentation fault
0x7ff37686550f ???
        ./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x7ff37697e159 __strlen_avx2
        ../sysdeps/x86_64/multiarch/strlen-avx2.S:76
0x7ff3768506c9 __libc_start_call_main
        ../sysdeps/nptl/libc_start_call_main.h:58
0x7ff376850784 __libc_start_main_impl
        ../csu/libc-start.c:360=