[Bug c++/86905] New: g++ ICE on valid code: verify_cgraph_node failed

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86905

            Bug ID: 86905
           Summary: g++ ICE on valid code: verify_cgraph_node failed
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: helloqirun at gmail dot com
  Target Milestone: ---

It appears to be a recent regression. g++-8.1 compiles.

$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 9.0.0 20180809 (experimental) [trunk revision 263445] (GCC)

$ g++-trunk abc.C
abc.C: In function ‘int pthread_equal()’:
abc.C:1:42: warning: no return statement in function returning non-void
[-Wreturn-type]
 extern "C" __inline int pthread_equal() {}
                                          ^
abc.C: At global scope:
abc.C:3:17: error: comdat-local function called by void b() outside its comdat
 void b() { a(); }
                 ^
_ZL1av/1 (int a()) @0x7f1523464420
  Type: function definition analyzed alias transparent_alias weakref
  Visibility: weak comdat_group:pthread_equal
  Same comdat group as: pthread_equal/0
  References: pthread_equal/0 (alias)
  Referring:
  First run: 0
  Function flags:
  Called by: void b()/2 (can throw external)
  Calls:
abc.C:3:17: internal compiler error: verify_cgraph_node failed
0xaf69ec cgraph_node::verify_node()
        ../../gcc/gcc/cgraph.c:3433
0xaeae8c symtab_node::verify()
        ../../gcc/gcc/symtab.c:1218
0xaeaf57 symtab_node::verify_symtab_nodes()
        ../../gcc/gcc/symtab.c:1238
0xafe434 symtab_node::checking_verify_symtab_nodes()
        ../../gcc/gcc/cgraph.h:625
0xafe434 symbol_table::compile()
        ../../gcc/gcc/cgraphunit.c:2520
0xb00399 symbol_table::compile()
        ../../gcc/gcc/cgraphunit.c:2517
0xb00399 symbol_table::finalize_compilation_unit()
        ../../gcc/gcc/cgraphunit.c:2698
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.




$ cat abc.C
extern "C" __inline int pthread_equal() {}
static __typeof(pthread_equal) a __attribute__((__weakref__("pthread_equal")));
void b() { a(); }