[Bug c++/44108] New: [4.6 Regression] -Wunused-but-set-variable does not consider array sizing use of a const variable

["rubidium at openttd dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Like PR c/43981, but still happening with 4.6.0 20100513 (Last Changed Rev:
159356
), which is why I copied and editted the title.

In case a const variable is used for array sizing it is not considered to be
read whereas a non-const variable would be considered to be read. It does NOT
happen when using gcc on a .c file, but it happens when using g++ on a .cpp
file, as such component c++.

See the attached test case which shows that only the const variables are
affected by this.


-- 
           Summary: [4.6 Regression] -Wunused-but-set-variable does not
                    consider array sizing use of a const variable
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rubidium at openttd dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44108