[Bug c++/97033] New: g++ hangs on valid code

[tangyixuan at mail dot dlut.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97033

            Bug ID: 97033
           Summary: g++ hangs on valid code
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tangyixuan at mail dot dlut.edu.cn
  Target Milestone: ---

Hi, g++ hangs when executing the following code with -Os, while clang++ is ok.

$ cat s.cpp

namespace A { 
    inline int F1 (){}
} 
int F2 ( int (* p )()){ 
    return p ();
}
 int main (){ 
    return F2 ( A :: F1 );
}

$ g++ -Os s.cpp && ./a.out
<hang>

$ g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc-20200906/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/gcc-20200906/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-11-20200906/configure --prefix=/usr/local/gcc-20200906
--enable-checking=release --enable-languages=c,c++ --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20200906 (experimental) (GCC)