https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63224
Bug ID: 63224
Summary: False Positive for -Wmaybe-uninitialized at -Os, not
-O2
Product: gcc
Version: 4.8.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: joel at gcc dot gnu.org
Target: arm-rtems sparc-rtems
This is for code from RTEMS. This warning appears to impact multiple targets. I
have only checked arm, i386, and sparc as doing this and powerpc as not. I can
follow up on all rtems targets if someone is interested and that helps debug.
I expect this is reproducible on other many targets.
Test code will be attached.
$ arm-rtems4.11-gcc -Wall -O2 -c unused.c
$ arm-rtems4.11-gcc -Wall -Os -c unused.c
../../../../../../rtems/c/src/../../cpukit/libfs/src/dosfs/msdos_conv.c: In
function 'msdos_filename_utf8_to_long_name_for_save':
../../../../../../rtems/c/src/../../cpukit/libfs/src/dosfs/msdos_conv.c:452:34:
warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
if ( name_size == UTF16_NULL_SIZE && c == UTF16_NULL ) {
^
