[Bug sanitizer/67867] New: UBSan bootstrap fails with error: ‘otype’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

[chefmax at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67867

            Bug ID: 67867
           Summary: UBSan bootstrap fails with error: ‘otype’ may be used
                    uninitialized in this function
                    [-Werror=maybe-uninitialized]
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chefmax at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org,
                    mpolacek at gcc dot gnu.org, y.gribov at samsung dot com
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu
             Build: x86_64-pc-linux-gnu

$ /home/max/build/master-ref/./prev-gcc/xg++
-B/home/max/build/master-ref/./prev-gcc/
-B/home/max/install/master-ref/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/home/max/build/master-ref/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/home/max/build/master-ref/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs

-I/home/max/build/master-ref/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu

-I/home/max/build/master-ref/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
 -I/home/max/workspace/downloads/gcc/libstdc++-v3/libsupc++
-L/home/max/build/master-ref/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/home/max/build/master-ref/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c  -DIN_GCC_FRONTEND -g -O2 -fsanitize=undefined -DIN_GCC    
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common  -DHAVE_CONFIG_H -I. -Icp -I/home/max/workspace/downloads/gcc/gcc
-I/home/max/workspace/downloads/gcc/gcc/cp
-I/home/max/workspace/downloads/gcc/gcc/../include
-I/home/max/workspace/downloads/gcc/gcc/../libcpp/include 
-I/home/max/workspace/downloads/gcc/gcc/../libdecnumber
-I/home/max/workspace/downloads/gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I/home/max/workspace/downloads/gcc/gcc/../libbacktrace   -o cp/search.o -MT
cp/search.o -MMD -MP -MF cp/.deps/search.TPo
/home/max/workspace/downloads/gcc/gcc/cp/search.c
/home/max/workspace/downloads/gcc/gcc/cp/search.c: In function ‘int
accessible_p(tree, tree, bool)’:
/home/max/workspace/downloads/gcc/gcc/cp/search.c:1011:41: error: ‘otype’ may
be used uninitialized in this function [-Werror=maybe-uninitialized]
   dfs_accessible_data d = { decl, otype };
                                         ^

$ /home/max/build/master-ref/./prev-gcc/xg++ -v
Using built-in specs.
COLLECT_GCC=/home/max/build/master-ref/./prev-gcc/xg++
Target: x86_64-unknown-linux-gnu
Configured with: /home/max/workspace/downloads/gcc/configure --enable-multilib
--enable-checking --target=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu
--prefix=/home/max/install/master-ref --enable-languages=c,c++,lto
--enable-bootstrap --with-build-config=bootstrap-ubsan
Thread model: posix
gcc version 6.0.0 20151006 (experimental) (GCC)

I'm also attaching preprocessed source as bug.i.