https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113132
Bug ID: 113132
Summary: [14 regression] --enable-checking=release build fails:
tree-vect-loop.cc:6221:34: error:
‘vec_stmts.vec<gimple*, va_heap, vl_ptr>::m_vec’ may
be used uninitialized [-Werror=maybe-uninitialized]
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
Target Milestone: ---
Noticed on today's build of master r14-6828-g0beeddd6b1b1cb :
$ ../gcc/configure --disable-multilib --enable-checking=release
$ make
...
/tmp/gb/./prev-gcc/xg++ -B/tmp/gb/./prev-gcc/
-B/usr/local/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
-I/home/slyfox/dev/git/gcc/libstdc++-v3/libsupc++
-L/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/tmp/gb/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs -fno-PIE -c
-g -O2 -fno-checking -gtoggle -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Wconditionally-supported
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -DHAVE_CONFIG_H -fno-PIE -I. -I.
-I/home/slyfox/dev/git/gcc/gcc -I/home/slyfox/dev/git/gcc/gcc/.
-I/home/slyfox/dev/git/gcc/gcc/../include
-I/home/slyfox/dev/git/gcc/gcc/../libcpp/include
-I/home/slyfox/dev/git/gcc/gcc/../libcody
-I/home/slyfox/dev/git/gcc/gcc/../libdecnumber
-I/home/slyfox/dev/git/gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/slyfox/dev/git/gcc/gcc/../libbacktrace -o tree-vect-loop.o -MT
tree-vect-loop.o -MMD -MP -MF ./.deps/tree-vect-loop.TPo
/home/slyfox/dev/git/gcc/gcc/tree-vect-loop.cc
/home/slyfox/dev/git/gcc/gcc/tree-vect-loop.cc: In function 'void
vect_create_epilog_for_reduction(loop_vec_info, stmt_vec_info, slp_tree,
slp_instance, edge)':
/home/slyfox/dev/git/gcc/gcc/tree-vect-loop.cc:6221:34: error:
'vec_stmts.vec<gimple*, va_heap, vl_ptr>::m_vec' may be used uninitialized
[-Werror=maybe-uninitialized]
6221 | def = gimple_get_lhs (vec_stmts[j]);
| ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
/home/slyfox/dev/git/gcc/gcc/tree-vect-loop.cc:6210:18: note:
'vec_stmts.vec<gimple*, va_heap, vl_ptr>::m_vec' was declared here
6210 | vec <gimple *> vec_stmts;
| ^~~~~~~~~
cc1plus: all warnings being treated as errors
make[3]: *** [Makefile:1198: tree-vect-loop.o] Error 1
make[3]: Leaving directory '/tmp/gb/gcc'
make[2]: *** [Makefile:5094: all-stage2-gcc] Error 2
make[2]: Leaving directory '/tmp/gb'
make[1]: *** [Makefile:26393: stage2-bubble] Error 2
make[1]: Leaving directory '/tmp/gb'
make: *** [Makefile:1096: all] Error 2
$ ./gcc/xgcc -v
Using built-in specs.
COLLECT_GCC=./gcc/xgcc
Target: x86_64-pc-linux-gnu
Configured with: /home/slyfox/dev/git/gcc/configure --disable-multilib
--enable-checking=release
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231225 (experimental) (GCC)
