[Bug middle-end/110697] New: [14 Regression] bootstrap failure on

[slyfox at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110697

            Bug ID: 110697
           Summary: [14 Regression] bootstrap failure on
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at gcc dot gnu.org
  Target Milestone: ---

Noticed bootstrap build failure today on r14-2553-ga5088dc3f5ef73 :

$ ~/dev/git/gcc/configure --disable-multilib
$ 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 -fno-common  -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-ssa-loop-ivcanon.o -MT
tree-ssa-loop-ivcanon.o -MMD -MP -MF ./.deps/tree-ssa-loop-ivcanon.TPo
/home/slyfox/dev/git/gcc/gcc/tree-ssa-loop-ivcanon.cc
/home/slyfox/dev/git/gcc/gcc/tree-ssa-loop-ivcanon.cc: In function 'bool
try_peel_loop(loop*, edge, tree, bool, long int)':
/home/slyfox/dev/git/gcc/gcc/tree-ssa-loop-ivcanon.cc:1170:17: error: variable
'entry_count' set but not used [-Werror=unused-but-set-variable]
 1170 |   profile_count entry_count = profile_count::zero ();
      |                 ^~~~~~~~~~~

$ prev-gcc/xg++ -Bprev-gcc -v
Reading specs from prev-gcc/specs
COLLECT_GCC=prev-gcc/xg++
COLLECT_LTO_WRAPPER=prev-gcc/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /home/slyfox/dev/git/gcc/configure --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230717 (experimental) (GCC)