https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121111
Bug ID: 121111
Summary: ICE on x86_64-linux-gnu: Segmentation fault with
vector_size on array
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jiangchangwu at smail dot nju.edu.cn
Target Milestone: ---
Compiler Explorer: https://gcc.godbolt.org/z/Gz5nTebWP
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gcc version:
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++ --prefix=/home/software/gcc-trunk --enable-coverage
--disable-werror --enable-checking=yes
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20250613 (experimental) (GCC)
*******************************************************************************
Program:
$ cat mutant.c
int a[][0] __attribute__((vector_size(16))) = {2};
*******************************************************************************
Command Lines:
$ gcc mutant.c
mutant.c:1:1: internal compiler error: Segmentation fault
1 | int a[][0] __attribute__((vector_size(16))) = {2};
| ^~~
0x5554b38 internal_error(char const*, ...)
../../gcc/gcc/diagnostic-global-context.cc:517
0x21651ec crash_signal
../../gcc/gcc/toplev.cc:321
0xec7bd3 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
../../gcc/gcc/tree.h:3856
0x16e64a3 size_binop_loc(unsigned long, tree_code, tree_node*, tree_node*)
../../gcc/gcc/fold-const.cc:2086
0xeefb0b add_flexible_array_elts_to_size
../../gcc/gcc/c/c-decl.cc:5425
0xef2dcf finish_decl(tree_node*, unsigned long, tree_node*, tree_node*,
tree_node*)
../../gcc/gcc/c/c-decl.cc:5919
0xff97a3 c_parser_declaration_or_fndef
../../gcc/gcc/c/c-parser.cc:2939
0xff59fd c_parser_external_declaration
../../gcc/gcc/c/c-parser.cc:2155
0xff4ea2 c_parser_translation_unit
../../gcc/gcc/c/c-parser.cc:2009
0x10a17ee c_parse_file()
../../gcc/gcc/c/c-parser.cc:30153
0x11d7aeb c_common_parse_file()
../../gcc/gcc/c-family/c-opts.cc:1385
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
