https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109802
--- Comment #2 from Alejandro Colomar <colomar.6.4.3 at gmail dot com> ---
Here's a simplified version that will cause the same internal compiler error.
This one will probably cause less brain damage to readers,
as it has significantly less magic.
$ cat flexi2.c
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
struct s {
int x;
ptrdiff_t off[0];
};
int
main(void)
{
char *p;
struct s *s;
s = malloc(sizeof(struct s) +
sizeof(ptrdiff_t) * 2 +
sizeof("foo") + sizeof("bar"));
p = (void *) s + sizeof(struct s) + sizeof(ptrdiff_t) * 2;
s->off[0] = p - (char *) s;
p = stpcpy(p, "foo") + 1;
s->off[1] = p - (char *) s;
p = stpcpy(p, "bar") + 1;
puts((char *) s + s->off[0]);
puts((char *) s + s->off[1]);
}
$ gcc-12 -Wall -Wextra -Werror -fanalyzer -O3 flexi2.c
$ ./a.out
foo
bar
$ gcc-13 -Wall -Wextra -Werror -O3 flexi2.c
$ ./a.out
foo
bar
$ gcc-13 -Wall -Wextra -Werror -fanalyzer -O3 flexi2.c
during IPA pass: analyzer
flexi2.c: In function ‘main’:
flexi2.c:29:33: internal compiler error: in make, at analyzer/store.cc:132
29 | puts((char *) s + s->off[1]);
| ~~~~~~^~~
0xcec8a5 ana::binding_key::make(ana::store_manager*, ana::region const*)
../../src/gcc/analyzer/store.cc:132
0xcf9533 ana::binding_cluster::get_binding(ana::store_manager*, ana::region
const*) const
../../src/gcc/analyzer/store.cc:1567
0xcf95eb ana::binding_cluster::get_binding_recursive(ana::store_manager*,
ana::region const*) const
../../src/gcc/analyzer/store.cc:1604
0xd05e49 ana::binding_cluster::get_any_binding(ana::store_manager*, ana::region
const*) const
../../src/gcc/analyzer/store.cc:1627
0xcd45f7 ana::region_model::get_store_value(ana::region const*,
ana::region_model_context*) const
../../src/gcc/analyzer/region-model.cc:2407
0xcd4e72 ana::region_model::get_rvalue(ana::path_var,
ana::region_model_context*) const
../../src/gcc/analyzer/region-model.cc:2297
0xcd6a5c ana::region_model::on_assignment(gassign const*,
ana::region_model_context*)
../../src/gcc/analyzer/region-model.cc:1156
0xcdc2da ana::exploded_node::on_stmt(ana::exploded_graph&, ana::supernode
const*, gimple const*, ana::program_state*, ana::uncertainty_t*,
ana::path_context*)
../../src/gcc/analyzer/engine.cc:1471
0xcdc877 ana::exploded_graph::process_node(ana::exploded_node*)
../../src/gcc/analyzer/engine.cc:4063
0xcdd8b9 ana::exploded_graph::process_worklist()
../../src/gcc/analyzer/engine.cc:3466
0xcddc57 ana::impl_run_checkers(ana::logger*)
../../src/gcc/analyzer/engine.cc:6125
0xcde4ff ana::run_checkers()
../../src/gcc/analyzer/engine.cc:6213
0xcde54b execute
../../src/gcc/analyzer/analyzer-pass.cc:87
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-13/README.Bugs> for instructions.
I didn't attach the preprocessed source of this simplified example, since I
guess it would be repetitive with the previous one.
