[Bug build/23442] New: New warning with GCC 8

["mliska at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23442

            Bug ID: 23442
           Summary: New warning with GCC 8
           Product: glibc
           Version: 2.27
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: mliska at suse dot cz
                CC: carlos at redhat dot com
  Target Milestone: ---

I see new warning being seen:

[  129s] gcc fnmatch.c -c -std=gnu11 -fgnu89-inline  -D_FORTIFY_SOURCE=2 -O2
-U_FORTIFY_SOURCE -Wall -Werror -Wundef -Wwrite-strings
-fasynchronous-unwind-tables -fmerge-all-constants -fmessage-length=0
-frounding-math -fstack-clash-protection -fstack-protector-strong
-funwind-tables -g -grecord-gcc-switches -Wstrict-prototypes
-Wold-style-definition      -ftls-model=initial-exec      -I../include
-I/home/abuild/rpmbuild/BUILD/glibc-2.27/cc-base/posix 
-I/home/abuild/rpmbuild/BUILD/glibc-2.27/cc-base 
-I../sysdeps/unix/sysv/linux/x86_64/64  -I../sysdeps/unix/sysv/linux/x86_64 
-I../sysdeps/unix/sysv/linux/x86  -I../sysdeps/x86/nptl 
-I../sysdeps/unix/sysv/linux/wordsize-64  -I../sysdeps/x86_64/nptl 
-I../sysdeps/unix/sysv/linux/include -I../sysdeps/unix/sysv/linux 
-I../sysdeps/nptl  -I../sysdeps/pthread  -I../sysdeps/gnu 
-I../sysdeps/unix/inet  -I../sysdeps/unix/sysv  -I../sysdeps/unix/x86_64 
-I../sysdeps/unix  -I../sysdeps/posix  -I../sysdeps/x86_64/64 
-I../sysdeps/x86_64/fpu/multiarch  -I../sysdeps/x86_64/fpu 
-I../sysdeps/x86/fpu/include -I../sysdeps/x86/fpu 
-I../sysdeps/x86_64/multiarch  -I../sysdeps/x86_64  -I../sysdeps/x86 
-I../sysdeps/ieee754/float128  -I../sysdeps/ieee754/ldbl-96/include
-I../sysdeps/ieee754/ldbl-96  -I../sysdeps/ieee754/dbl-64/wordsize-64 
-I../sysdeps/ieee754/dbl-64  -I../sysdeps/ieee754/flt-32 
-I../sysdeps/wordsize-64  -I../sysdeps/ieee754  -I../sysdeps/generic  -I..
-I../libio -I.   -D_LIBC_REENTRANT -include
/home/abuild/rpmbuild/BUILD/glibc-2.27/cc-base/libc-modules.h
-DMODULE_NAME=libc -include ../include/libc-symbols.h  -DPIC    
-DTOP_NAMESPACE=glibc -o
/home/abuild/rpmbuild/BUILD/glibc-2.27/cc-base/posix/fnmatch.o -MD -MP -MF
/home/abuild/rpmbuild/BUILD/glibc-2.27/cc-base/posix/fnmatch.o.dt -MT
/home/abuild/rpmbuild/BUILD/glibc-2.27/cc-base/posix/fnmatch.o

[  129s] In file included from fnmatch.c:243:
[  129s] fnmatch_loop.c: In function 'internal_fnwmatch':
[  129s] ../locale/weightwc.h:103:28: error: array subscript 1 is outside array
bounds of 'wint_t[1]' {aka 'unsigned int[1]'} [-Werror=array-bounds]
[  129s]     if (cp[nhere - 1] > usrc[nhere -1])
[  129s]                         ~~~~^~~~~~~~~~

It's seen on GCC trunk since r262893.

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