[Bug c++/96162] New: [11 Regression] ICE in discriminator_for_local_entity, at cp/mangle.c:1910

["haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96162

            Bug ID: 96162
           Summary: [11 Regression] ICE in discriminator_for_local_entity,
                    at cp/mangle.c:1910
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

Hi, all.

This code, test.cc, is an invalid code, makes GCC-trunk ICE. Interestingly,
this code does not trigger other released GCC-10 or GCC-9 ICE (confused by
earlier errors, bailing out). I guess this is a special regression
error-recovery case that is different from others.

$cat test.cc
#include <iostream>
void foo() {  
    for (thread_local int * a ){}
}

$g++ test.cc
test.cc: In function ‘void foo()’:
test.cc:3:30: error: expected ‘;’ before ‘)’ token
    3 |     for (thread_local int * a ){}
      |                              ^~
      |                              ;
test.cc:3:31: error: expected primary-expression before ‘)’ token
    3 |     for (thread_local int * a ){}
      |                               ^
test.cc:3:30: error: expected ‘;’ before ‘)’ token
    3 |     for (thread_local int * a ){}
      |                              ^~
      |                              ;
test.cc: At global scope:
test.cc:3:29: internal compiler error: in discriminator_for_local_entity, at
cp/mangle.c:1910
    3 |     for (thread_local int * a ){}
      |                             ^
0x69e943 discriminator_for_local_entity
        ../../gcc/cp/mangle.c:1910
0x9cdee8 write_local_name
        ../../gcc/cp/mangle.c:2019
0x9cdee8 write_name
        ../../gcc/cp/mangle.c:973
0x9d05a7 write_encoding
        ../../gcc/cp/mangle.c:825
0x9d5981 mangle_decl_string
        ../../gcc/cp/mangle.c:3858
0x9d5ba6 get_mangled_id
        ../../gcc/cp/mangle.c:3879
0x9d5ba6 mangle_decl(tree_node*)
        ../../gcc/cp/mangle.c:3917
0x12fca7d decl_assembler_name(tree_node*)
        ../../gcc/tree.c:708
0xbf17d9 symbol_table::insert_to_assembler_name_hash(symtab_node*, bool)
        ../../gcc/symtab.c:174
0xbf193c symbol_table::symtab_initialize_asm_name_hash()
        ../../gcc/symtab.c:266
0xbf2334 symbol_table::symtab_initialize_asm_name_hash()
        ../../gcc/symtab.c:1033
0xbf2334 symtab_node::get_for_asmname(tree_node const*)
        ../../gcc/symtab.c:1021
0xc02e60 handle_alias_pairs
        ../../gcc/cgraphunit.c:1512
0xc08ccc symbol_table::finalize_compilation_unit()
        ../../gcc/cgraphunit.c:2962
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.

$g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/haoxin/compilers/gcc/build/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure CC=gcc-10 CXX=g++-10
--prefix=/home/haoxin/compilers/gcc/build/ --enable-languages=c,c++
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20200708 (experimental) (GCC) 

Thanks,
Haoxin