seen with the gcc-10 branch and the trunk, gcc configured with --enable-checking=yes,extra,rtl
gcc-9 configured here with --enable-checking=release, so I don't know if that's a regression.
$ cat qq.i int m(int a) { return sizeof((char[a])); };
$ gcc-9 -c qq.i qq.i: In function ‘m’: qq.i:1:39: error: expected expression before ‘)’ token 1 | int m(int a) { return sizeof((char[a])); }; | ^
$ gcc-10 -c qq.i qq.i: In function ‘m’: qq.i:1:39: error: expected expression before ‘)’ token 1 | int m(int a) { return sizeof((char[a])); }; | ^ qq.i:1:39: internal compiler error: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in c_expr_sizeof_expr, at c/c-typeck.c:2946 0x7602ef tree_class_check_failed(tree_node const*, tree_code_class, char const*, int, char const*) ../../src/gcc/tree.c:9780 0x5c2697 tree_class_check(tree_node*, tree_code_class, char const*, int, char const*) ../../src/gcc/tree.h:3417 0x5c2697 c_expr_sizeof_expr(unsigned int, c_expr) ../../src/gcc/c/c-typeck.c:2946 0xa274b7 c_parser_sizeof_expression ../../src/gcc/c/c-parser.c:8348 0xa274b7 c_parser_unary_expression ../../src/gcc/c/c-parser.c:8245 0xa280fd c_parser_cast_expression ../../src/gcc/c/c-parser.c:8115 0xa28389 c_parser_binary_expression ../../src/gcc/c/c-parser.c:7918 0xa29365 c_parser_conditional_expression ../../src/gcc/c/c-parser.c:7652 0xa29980 c_parser_expr_no_commas ../../src/gcc/c/c-parser.c:7569 0xa29be1 c_parser_expression ../../src/gcc/c/c-parser.c:10644 0xa2a387 c_parser_expression_conv ../../src/gcc/c/c-parser.c:10677 0xa20861 c_parser_statement_after_labels ../../src/gcc/c/c-parser.c:6212 0xa21d11 c_parser_compound_statement_nostart ../../src/gcc/c/c-parser.c:5805 0xa407c4 c_parser_compound_statement ../../src/gcc/c/c-parser.c:5617 0xa42281 c_parser_declaration_or_fndef ../../src/gcc/c/c-parser.c:2505 0xa4a3f3 c_parser_external_declaration ../../src/gcc/c/c-parser.c:1745 0xa4aef1 c_parser_translation_unit ../../src/gcc/c/c-parser.c:1618 0xa4aef1 c_parse_file() ../../src/gcc/c/c-parser.c:21752 0xaa21fb c_common_parse_file() ../../src/gcc/c-family/c-opts.c:1190 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report.
seen with the gcc-10 branch and the trunk, gcc configured with checking= yes,extra, rtl
--enable-
gcc-9 configured here with --enable- checking= release, so I don't know if that's a regression.
$ cat qq.i
int m(int a) { return sizeof((char[a])); };
$ gcc-9 -c qq.i
qq.i: In function ‘m’:
qq.i:1:39: error: expected expression before ‘)’ token
1 | int m(int a) { return sizeof((char[a])); };
| ^
$ gcc-10 -c qq.i check_failed( tree_node const*, tree_code_class, char const*, int, char const*)
../../ src/gcc/ tree.c: 9780 check(tree_ node*, tree_code_class, char const*, int, char const*)
../../ src/gcc/ tree.h: 3417 sizeof_ expr(unsigned int, c_expr)
../../ src/gcc/ c/c-typeck. c:2946 sizeof_ expression
../../ src/gcc/ c/c-parser. c:8348 unary_expressio n
../../ src/gcc/ c/c-parser. c:8245 cast_expression
../../ src/gcc/ c/c-parser. c:8115 binary_ expression
../../ src/gcc/ c/c-parser. c:7918 conditional_ expression
../../ src/gcc/ c/c-parser. c:7652 expr_no_ commas
../../ src/gcc/ c/c-parser. c:7569
../../ src/gcc/ c/c-parser. c:10644 expression_ conv
../../ src/gcc/ c/c-parser. c:10677 statement_ after_labels
../../ src/gcc/ c/c-parser. c:6212 compound_ statement_ nostart
../../ src/gcc/ c/c-parser. c:5805 compound_ statement
../../ src/gcc/ c/c-parser. c:5617 declaration_ or_fndef
../../ src/gcc/ c/c-parser. c:2505 external_ declaration
../../ src/gcc/ c/c-parser. c:1745 translation_ unit
../../ src/gcc/ c/c-parser. c:1618
../../ src/gcc/ c/c-parser. c:21752 parse_file( )
../../ src/gcc/ c-family/ c-opts. c:1190
qq.i: In function ‘m’:
qq.i:1:39: error: expected expression before ‘)’ token
1 | int m(int a) { return sizeof((char[a])); };
| ^
qq.i:1:39: internal compiler error: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in c_expr_sizeof_expr, at c/c-typeck.c:2946
0x7602ef tree_class_
0x5c2697 tree_class_
0x5c2697 c_expr_
0xa274b7 c_parser_
0xa274b7 c_parser_
0xa280fd c_parser_
0xa28389 c_parser_
0xa29365 c_parser_
0xa29980 c_parser_
0xa29be1 c_parser_expression
0xa2a387 c_parser_
0xa20861 c_parser_
0xa21d11 c_parser_
0xa407c4 c_parser_
0xa42281 c_parser_
0xa4a3f3 c_parser_
0xa4aef1 c_parser_
0xa4aef1 c_parse_file()
0xaa21fb c_common_
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.