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From: "frank.mehnert at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99508] New: Asm labels declared inside a function are ignored
Date: Wed, 10 Mar 2021 08:22:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99508

            Bug ID: 99508
           Summary: Asm labels declared inside a function are ignored
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: frank.mehnert at googlemail dot com
  Target Milestone: ---

This is apparently a gcc-11 regression. Following example:

#include <cstdio>
void foo()
{
  void bar() asm ("bar_assembler");
  extern unsigned buzz asm("buzz_assembler");
  bar();
  printf("%d\n", buzz);
}

Compile this C++ source code with -c and look at the generated symbols with
'objdump -tC'.=20

g++-10:
0000000000000000         *UND*  0000000000000000 bar_assembler
0000000000000000         *UND*  0000000000000000 buzz_assembler
0000000000000000         *UND*  0000000000000000 printf

g++-11: (Debian experimental 20210306):
0000000000000000         *UND*  0000000000000000 bar()
0000000000000000         *UND*  0000000000000000 buzz
0000000000000000         *UND*  0000000000000000 printf

g++11 produces the same result as g++10 if 'bar' and 'buzz' are declared
outside foo().=