https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117142
Bug ID: 117142
Summary: ICE: verify_flow_info failed: error: returns_twice
call is not first in basic block 2 at -O1 and above
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: iamanonymous.cs at gmail dot com
Target Milestone: ---
*******************************************************************************
OS and Platform:
$ uname -a:
Linux 65dac7c84719 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC
2023 x86_64 x86_64 x86_64 GNU/Linux
*******************************************************************************
gcc version:
Using built-in specs.
COLLECT_GCC=/home/software/gcc-trunk-3aa004f/bin/gcc
COLLECT_LTO_WRAPPER=/home/software/gcc-trunk-3aa004f/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/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-3aa004f
--enable-coverage
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240630 (experimental) (GCC)
*******************************************************************************
Program:
$ cat mutant.c
struct a {
int b;
} c();
void __attribute__((returns_twice)) bar() {
struct a d;
{
bar(d);
c(d.b, d.b);
}
}
*******************************************************************************
Command Lines:
$ gcc -O1 mutant.c
mutant.c: In function 'bar':
mutant.c:10:1: error: returns_twice call is not first in basic block 2
10 | }
| ^
bar (d);
during GIMPLE pass: esra
mutant.c:10:1: internal compiler error: verify_flow_info failed
0x5071bcf diagnostic_context::report_diagnostic(diagnostic_info*)
???:0
0x50724a1 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, int, char const*, __va_list_tag (*) [1],
diagnostic_t)
???:0
0x50924c7 internal_error(char const*, ...)
???:0
0x11b395c verify_flow_info()
???:0
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.
It can be compiled normally with -O0.
Also ICE on trunk.
Compiler Explorer: https://godbolt.org/z/c3YGen7hb
