[Bug bootstrap/78985] New: [7 Regression] profiledbootstrap failure by -Wuninitialized

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78985

            Bug ID: 78985
           Summary: [7 Regression] profiledbootstrap failure by
                    -Wuninitialized
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: build, diagnostic
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---
            Target: s390x-*-*

profiledbootstrap fails for me on s390x-linux for quite some time now
(also on aarch64-linux in a similar way, but re-checking with current trunk
didn't finish/fail yet).  lab_over is obviously not uninitialized
(but eventually jump threading gets in the way - I did not analyze this yet
as I lack a way to extract a testcase at the moment).


../configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man
--libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,go --enable-checking=release
--with-gxx-include-dir=/usr/include/c++/7 --enable-ssp --disable-libssp
--disable-libvtv --disable-libmpx --disable-libcc1 --enable-plugin
--with-bugurl=http://bugs.opensuse.org/ '--with-pkgversion=SUSE Linux'
--with-slibdir=/lib64 --with-system-zlib --enable-__cxa_atexit
--enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--enable-version-specific-runtime-libs --enable-linker-build-id
--enable-linux-futex --enable-gnu-indirect-function --program-suffix=-7
--disable-multilib --without-system-libunwind --with-tune=zEC12
--with-arch=z196 --with-long-double-128 --enable-decimal-float
--build=s390x-suse-linux --host=s390x-suse-linux
...
[ 4042s] ../../gcc/config/s390/s390.c: In function 'tree_node*
s390_gimplify_va_
arg(tree, tree, gimple**, gimple**)':
[ 4042s] ../../gcc/config/s390/s390.c:12296:52: error: 'lab_over' may be used
un
initialized in this function [-Werror=maybe-uninitialized]
[ 4042s]      gimple_seq_add_stmt (pre_p, gimple_build_label (lab_over));
[ 4042s]                                  ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
...
[ 4044s] cc1plus: all warnings being treated as errors
[ 4044s] make[3]: *** [Makefile:2221: s390.o] Error 1
[ 4044s] make[3]: *** Waiting for unfinished jobs....
[ 4045s] rm fsf-funding.pod gcov.pod gfdl.pod cpp.pod gpl.pod gfortran.pod
gcc.pod gccgo.pod gcov-tool.pod
[ 4045s] make[3]: Leaving directory
'/home/abuild/rpmbuild/BUILD/gcc-7.0.0-r244052/obj-s390x-suse-linux/gcc'
[ 4045s] make[2]: *** [Makefile:4725: all-stagefeedback-gcc] Error 2
[ 4045s] make[2]: Leaving directory
'/home/abuild/rpmbuild/BUILD/gcc-7.0.0-r244052/obj-s390x-suse-linux'