[Bug c/98198] New: [11 Regression] internal compiler error: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in decl_or_type_attrs

["anbu1024.me at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98198

            Bug ID: 98198
           Summary: [11 Regression] internal compiler error: tree check:
                    expected class ‘type’, have ‘exceptional’ (error_mark)
                    in decl_or_type_attrs
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anbu1024.me at gmail dot com
  Target Milestone: ---

$ cat test-6951.c 

static inline void sub_1 ( ) { 
        struct struct_1 var_9 , var_10
}

static int var_9[1] __attribute__ ( ( section ( ".data" ) ) ) ; 

--------------------------------------------------------------------------------

$ gcc-11 --version
gcc (GCC) 11.0.0 20201129 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

--------------------------------------------------------------------------------

$ gcc-11 test-6951.c 
test-6951.c: In function ‘sub_1’:
test-6951.c:3:25: error: storage size of ‘var_9’ isn’t known
    3 |         struct struct_1 var_9 , var_10
      |                         ^~~~~
test-6951.c:4:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before
‘}’ token
    4 | }
      | ^
test-6951.c:6:1: internal compiler error: tree check: expected class ‘type’,
have ‘exceptional’ (error_mark) in decl_or_type_attrs, at
c-family/c-attribs.c:775
    6 | static int var_9[1] __attribute__ ( ( section ( ".data" ) ) ) ;
      | ^~~~~~
0x753c11 tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        ../../gcc-11-20201129/gcc/tree.c:9860
0x642f30 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        ../../gcc-11-20201129/gcc/tree.h:3454
0x642f30 decl_or_type_attrs
        ../../gcc-11-20201129/gcc/c-family/c-attribs.c:775
0x642f30 validate_attr_args
        ../../gcc-11-20201129/gcc/c-family/c-attribs.c:803
0x90691d validate_attr_arg
        ../../gcc-11-20201129/gcc/c-family/c-attribs.c:889
0x90691d handle_section_attribute
        ../../gcc-11-20201129/gcc/c-family/c-attribs.c:2132
0x80d0dc decl_attributes(tree_node**, tree_node*, int, tree_node*)
        ../../gcc-11-20201129/gcc/attribs.c:723
0x8295f2 start_decl(c_declarator*, c_declspecs*, bool, tree_node*, unsigned
int*)
        ../../gcc-11-20201129/gcc/c/c-decl.c:5188
0x884e32 c_parser_declaration_or_fndef
        ../../gcc-11-20201129/gcc/c/c-parser.c:2302
0x867ef0 c_parser_compound_statement_nostart
        ../../gcc-11-20201129/gcc/c/c-parser.c:5700
0x8848f5 c_parser_compound_statement
        ../../gcc-11-20201129/gcc/c/c-parser.c:5597
0x886378 c_parser_declaration_or_fndef
        ../../gcc-11-20201129/gcc/c/c-parser.c:2539
0x88dbe3 c_parser_external_declaration
        ../../gcc-11-20201129/gcc/c/c-parser.c:1777
0x88e629 c_parser_translation_unit
        ../../gcc-11-20201129/gcc/c/c-parser.c:1650
0x88e629 c_parse_file()
        ../../gcc-11-20201129/gcc/c/c-parser.c:21877
0x8ebdfd c_common_parse_file()
        ../../gcc-11-20201129/gcc/c-family/c-opts.c:1198
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.

--------------------------------------------------------------------------------

$ gcc-10 --version
gcc (GCC) 10.2.1 20201128
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

--------------------------------------------------------------------------------

$ gcc-10 test-6951.c 
test-6951.c: In function ‘sub_1’:
test-6951.c:3:18: error: storage size of ‘var_9’ isn’t known
    3 |  struct struct_1 var_9 , var_10
      |                  ^~~~~
test-6951.c:4:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before
‘}’ token
    4 | }
      | ^
test-6951.c:6:1: error: expected declaration or statement at end of input
    6 | static int var_9[1] __attribute__ ( ( section ( ".data" ) ) ) ;
      | ^~~~~~