------- Comment #1 from bugs at nospam dot pz dot podzone dot net 2009-08-21
13:31 -------
$ cat foo.c
unsigned char foo;
Also note the inconsistency between x86 gcc and avr-gcc:
void test(void)
{
foo &= ~0xff; /* warning */
foo &= ~0xfe; /* no warning */
foo &= 65280; /* warning */
foo &= 65280L; /* warning */
foo &= 65280U; /* no warning */
foo &= 65280LU; /* no warning */
foo &= 0xff00; /* warning only with x86 gcc */
foo &= 0xff00L; /* warning */
foo &= 0xff00U; /* no warning */
foo &= 0xff00LU; /* no warning */
foo &= 65281; /* no warning */
foo &= 65281L; /* no warning */
foo &= 65281U; /* no warning */
foo &= 65281LU; /* no warning */
foo &= 0xff01; /* no warning */
foo &= 0xff01L; /* no warning */
foo &= 0xff01U; /* no warning */
foo &= 0xff01LU; /* no warning */
}
$ avr-gcc -c foo.c
foo.c: In function 'test':
foo.c:5: warning: overflow in implicit constant conversion
foo.c:8: warning: overflow in implicit constant conversion
foo.c:9: warning: overflow in implicit constant conversion
foo.c:14: warning: overflow in implicit constant conversion
$ gcc-4 -c foo.c
foo.c: In function 'test':
foo.c:5: warning: overflow in implicit constant conversion
foo.c:8: warning: overflow in implicit constant conversion
foo.c:9: warning: overflow in implicit constant conversion
foo.c:13: warning: overflow in implicit constant conversion
foo.c:14: warning: overflow in implicit constant conversion
$ avr-gcc --version
avr-gcc.exe (WinAVR 20090313) 4.3.2
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc-4 --version
gcc-4 (GCC) 4.3.2 20080827 (beta) 2
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$
--
bugs at nospam dot pz dot podzone dot net changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bugs at nospam dot pz dot
| |podzone dot net
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41138
