https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110698
Bug ID: 110698
Summary: Bootstrap fails with [-Werror=unused-but-set-variable]
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: juergen.reuter at desy dot de
Target Milestone: ---
This seems to be a very recent problem: last week (as of July 10) the bootstrap
did still work with the gcc master, and now it is failing, cf. below.
That should be pretty easy to find.
#11 3096.5 /usr/src/gcc/gcc/expmed.cc: In function 'rtx_def*
extract_bit_field_1(rtx, poly_uint64, poly_uint64, int, rtx, machine_mode,
machine_mode, bool, bool, rtx_def**)':
#11 3096.5 /usr/src/gcc/gcc/expmed.cc:1838:45: warning: '*(unsigned
int*)((char*)&imode + offsetof(scalar_int_mode, scalar_int_mode::m_mode))' may
be used uninitialized [-Wmaybe-uninitialized]
#11 3096.5 1838 | rtx sub = extract_bit_field_as_subreg (mode1, op0,
imode,
#11 3096.5 |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
#11 3096.5 1839 | bitsize,
bitnum);
#11 3096.5 |
~~~~~~~~~~~~~~~~
#11 3096.5 /usr/src/gcc/gcc/expmed.cc:1798:19: note: '*(unsigned
int*)((char*)&imode + offsetof(scalar_int_mode, scalar_int_mode::m_mode))' was
declared here
#11 3096.5 1798 | scalar_int_mode imode;
#11 3096.5 | ^~~~~
#11 3754.2 /usr/src/gcc/gcc/tree-ssa-loop-ivcanon.cc: In function 'bool
try_peel_loop(loop*, edge, tree, bool, long int)':
#11 3754.2 /usr/src/gcc/gcc/tree-ssa-loop-ivcanon.cc:1170:17: error: variable
'entry_count' set but not used [-Werror=unused-but-set-variable]
#11 3754.2 1170 | profile_count entry_count = profile_count::zero ();
#11 3754.2 | ^~~~~~~~~~~
#11 3758.5 cc1plus: all warnings being treated as errors
