Re: [head tinderbox] failure on arm/arm

On Sun, Nov 12, 2006 at 05:00:10PM +0300, Ruslan Ermilov wrote:
> On Sun, Nov 12, 2006 at 08:39:29AM -0500, FreeBSD Tinderbox wrote:
> > >>> stage 4.2: building libraries
> > [...]
> > cc -O2 -pipe  -I/obj/arm/src/lib/libelf -I/src/lib/libelf -DLIBELF_TEST_HOOKS=1 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c /src/lib/libelf/elf_getident.c
> > cc -O2 -pipe  -I/obj/arm/src/lib/libelf -I/src/lib/libelf -DLIBELF_TEST_HOOKS=1 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c /src/lib/libelf/elf_hash.c
> > cc -O2 -pipe  -I/obj/arm/src/lib/libelf -I/src/lib/libelf -DLIBELF_TEST_HOOKS=1 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c /src/lib/libelf/elf_kind.c
> > cc -O2 -pipe  -I/obj/arm/src/lib/libelf -I/src/lib/libelf -DLIBELF_TEST_HOOKS=1 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c /src/lib/libelf/elf_memory.c
> > cc -O2 -pipe  -I/obj/arm/src/lib/libelf -I/src/lib/libelf -DLIBELF_TEST_HOOKS=1 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c /src/lib/libelf/elf_next.c
> > cc -O2 -pipe  -I/obj/arm/src/lib/libelf -I/src/lib/libelf -DLIBELF_TEST_HOOKS=1 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c /src/lib/libelf/elf_rand.c
> > /src/lib/libelf/elf_rand.c: In function `elf_rand':
> > /src/lib/libelf/elf_rand.c:47: warning: cast increases required alignment of target type
> > *** Error code 1
> > 
> > Stop in /src/lib/libelf.
> > *** Error code 1
> > 
> This looks like a GCC bug to me.  The following code snippet,
> when compiled on FreeBSD/arm, causes a -Wcast-align warning
> which doesn't look right:
> 
> %%%
> $ cat a.c
> struct foo {
> 	char x;
> };
> 
> struct foo *
> bubu(char *s)
> {
> 
> 	return (struct foo *)s;
> }
> $ cc -c -Wcast-align a.c
> a.c: In function `bubu':
> a.c:9: warning: cast increases required alignment of target type
> %%%
> 
> (None of other supported architecutes see the issue here.)

What is sizeof(struct foo)?  If it's > 1 it makes sense.

Stefan