Target: i686-pc-linux-gnulibc2
Configured with: ../configure --prefix=/tmp/gcc-4.3.1 --disable-nls
--enable-shared --with-sysroot=/usr/i686-pc-linux-gnulibc2/
i686-pc-linux-gnulibc2
gcc version 4.3.1 (GCC)
$ gcc -O -Wall -Wuninitialized -c -o t.o t.c
$ gcc -O -Wall -Wuninitialized -fno-unit-at-a-time -c -o t.o t.c
t.c: In function 'f1':
t.c:14: warning: 'pp' may be used uninitialized in this function
$ cat t.c
struct a
{ struct a *n;
struct b *b;
};
struct b
{ struct b *n;
};
extern struct a *a;
static int
f1 (struct b *b)
{ struct b *pp;
struct b *p;
for (p = b; p; p = p->n) pp = p;
return (!pp);
}
int
f2 (void)
{ struct a *p;
for (p = a; p; p = p->n) if (f1 (p->b)) return 0;
return 1;
}
An older version of gcc (gcc (GCC) 3.3.3) works as expected.
A current version of gcc from Debian Unstable (gcc (Debian 4.3.1-6) 4.3.1)
shows the same failure
--
Summary: Fails to warn about possibly uninitialized variables
Product: gcc
Version: 4.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: heide-gcc at bfw-online dot de
GCC build triplet: i686-pc-linux-gnulibc2
GCC host triplet: i686-pc-linux-gnulibc2
GCC target triplet: i686-pc-linux-gnulibc2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36823
