[Bug c/47882] New: Incorrect "array subscript is above array bounds" warning

2011-02-24 Thread anders at 0x63 dot nu 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47882

   Summary: Incorrect "array subscript is above array bounds"
warning
   Product: gcc
   Version: 4.4.5
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: and...@0x63.nu


Created attachment 23454
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23454
testcase

$ gcc-4.4 -Wall -Werror -O2 -c -o bounds2.o bounds2.c
cc1: warnings being treated as errors
bounds2.c: In function ‘entry’:
bounds2.c:18: error: array subscript is above array bounds


$ gcc-4.4 -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.5-8'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.4 --enable-shared --enable-multiarch
--enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
--enable-targets=all --with-arch-32=i586 --with-tune=generic
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.4.5 (Debian 4.4.5-8) 



Also happens with debian's gcc-4.3:

$ gcc-4.3 -Wall -Werror -O2 -c -o bounds2.o bounds2.c
cc1: warnings being treated as errors
bounds2.c: In function ‘entry’:
bounds2.c:18: error: array subscript is above array bounds

$ gcc-4.3 -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.3.5-4'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3
--enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr
--enable-targets=all --with-tune=generic --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.5 (Debian 4.3.5-4)

[Bug c/47882] Incorrect "array subscript is above array bounds" warning

2011-02-25 Thread anders at 0x63 dot nu 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47882

--- Comment #2 from Anders Waldenborg  2011-02-25 
08:51:47 UTC ---
Is there a specific patch that fixes this problem? So I can backport the fix to
4.3.