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From: "niko.lecam at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/48795] New: -Warray-bounds false positive
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D48795

           Summary: -Warray-bounds false positive
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: niko.lecam@gmail.com


$ gcc -v
Utilisation des specs internes.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/usr/lib/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapp=
er
Target: x86_64-unknown-linux-gnu
Configur=C3=A9 avec: /build/src/gcc-4.6-20110415/configure --prefix=3D/usr
--libdir=3D/usr/lib --libexecdir=3D/usr/lib --mandir=3D/usr/share/man
--infodir=3D/usr/share/info --with-bugurl=3Dhttps://bugs.archlinux.org/
--enable-languages=3Dc,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=3Dposix --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=3Dgnu --enable-gnu-unique-o=
bject
--enable-linker-build-id --with-ppl --enable-cloog-backend=3Disl --enable-l=
to
--enable-gold --enable-ld=3Ddefault --enable-plugin --with-plugin-ld=3Dld.g=
old
--enable-multilib --disable-libstdcxx-pch --enable-checking=3Drelease
Mod=C3=A8le de thread: posix
gcc version 4.6.0 20110415 (prerelease) (GCC)

$ cat t.c=20
/* testcase (derived from wine) */
typedef struct
{
  int len;
  char data[1];
} rec;

int
p(rec *r, int len);

int
f (char prm1, char prm2)
{
  char buf[10];

  rec *r1 =3D (rec *)&buf;

  r1->len =3D 10;
  r1->data[0] =3D prm1;
  r1->data[1] =3D prm2;

  return p(r1, r1->len);
}

$ gcc -S -O2 -Wall t.c -save-temps
t.c: In function =E2=80=98f=E2=80=99:
t.c:19:11: attention : array subscript is above array bounds [-Warray-bound=
s]