https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102764
Bug ID: 102764
Summary: -fcompare-debug failure (length) at -O3
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: cnsun at uwaterloo dot ca
Target Milestone: ---
(Really do not know what is the best summary for this bug.)
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.gzh6IUhxke-gcc-builder/gcc/configure
--enable-languages=c,c++,lto --enable-checking-yes --enable-multiarch
--prefix=/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20211014 (experimental) [master -gee9fa8a57] (GCC)
$ cat mutant.c
volatile a;
main() {
int i;
for (i = 0; i < 1000; i++)
if (i % 17)
a++;
}
$ gcc-trunk -w -fcompare-debug -O3 mutant.c
gcc-trunk: error: mutant.c: ‘-fcompare-debug’ failure (length)
