https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71573
Bug ID: 71573
Summary: ICE on invalid C code on x86_64-linux-gnu (tree check:
expected function_decl, have var_decl in
implicitly_declare)
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Target Milestone: ---
The following code crashes the trunk on on x86_64-linux-gnu in both 32-bit and
64-bit modes.
gcc-6.1 and all older versions do not crash. This should be a recent
regression.
$: gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160617 (experimental) [trunk revision 237557] (GCC)
$:
$: gcc-trunk small.c
small.c: In function ‘f2’:
small.c:4:3: internal compiler error: tree check: expected function_decl, have
var_decl in implicitly_declare, at c/c-decl.c:3313
t(g);
^
0xe6b3bc tree_check_failed(tree_node const*, char const*, int, char const*,
...)
../../gcc-source-trunk/gcc/tree.c:9752
0x64dc01 tree_check
../../gcc-source-trunk/gcc/tree.h:3030
0x64dc01 implicitly_declare(unsigned int, tree_node*)
../../gcc-source-trunk/gcc/c/c-decl.c:3313
0x66ba52 build_external_ref(unsigned int, tree_node*, int, tree_node**)
../../gcc-source-trunk/gcc/c/c-typeck.c:2728
0x6a1457 c_parser_postfix_expression
../../gcc-source-trunk/gcc/c/c-parser.c:7497
0x6a1c2a c_parser_unary_expression
../../gcc-source-trunk/gcc/c/c-parser.c:6942
0x6a2a3a c_parser_cast_expression
../../gcc-source-trunk/gcc/c/c-parser.c:6771
0x6a2c44 c_parser_binary_expression
../../gcc-source-trunk/gcc/c/c-parser.c:6580
0x6a38f5 c_parser_conditional_expression
../../gcc-source-trunk/gcc/c/c-parser.c:6351
0x6a3f70 c_parser_expr_no_commas
../../gcc-source-trunk/gcc/c/c-parser.c:6268
0x6a4672 c_parser_expression
../../gcc-source-trunk/gcc/c/c-parser.c:8463
0x6a50d9 c_parser_expression_conv
../../gcc-source-trunk/gcc/c/c-parser.c:8496
0x6bb408 c_parser_statement_after_labels
../../gcc-source-trunk/gcc/c/c-parser.c:5287
0x6bd2ab c_parser_compound_statement_nostart
../../gcc-source-trunk/gcc/c/c-parser.c:4861
0x6bdb3e c_parser_compound_statement
../../gcc-source-trunk/gcc/c/c-parser.c:4696
0x6bed67 c_parser_declaration_or_fndef
../../gcc-source-trunk/gcc/c/c-parser.c:2105
0x6c7f95 c_parser_external_declaration
../../gcc-source-trunk/gcc/c/c-parser.c:1549
0x6c8829 c_parser_translation_unit
../../gcc-source-trunk/gcc/c/c-parser.c:1430
0x6c8829 c_parse_file()
../../gcc-source-trunk/gcc/c/c-parser.c:17930
0x72b1b2 c_common_parse_file()
../../gcc-source-trunk/gcc/c-family/c-opts.c:1070
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$:
$: cat small.c
void f1() { extern int t; }
void f2() {
int g;
t(g);
}
$:
