[Bug c/32207] New: inconsistent/missed warnings about address of 'x'.

["pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>]

the following testcase express one condition in three different ways.
in fact, gcc produces only two different warnings.

extern void z();
void f() { if ( z ) z(); }
void g() { if ( z != 0 ) z(); }
void h() { if ( z != (void*)0 ) z(); }

t.c: In function 'f':
t.c:2: warning: the address of 'z' will always evaluate as 'true'
t.c: In function 'g':
t.c:3: warning: the address of 'z' will never be NULL


-- 
           Summary: inconsistent/missed warnings about address of 'x'.
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pluto at agmk dot net
GCC target triplet: x86_64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32207