Re: [head tinderbox] failure on arm/arm

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.)


Cheers,
-- 
Ruslan Ermilov
ru_at_FreeBSD.org
FreeBSD committer