Date: Sun, 12 Nov 2006 15:27:10 +0100 From: Stefan Farfeleder <stefan@fafoe.narf.at> To: Ruslan Ermilov <ru@freebsd.org> Cc: arm@freebsd.org, FreeBSD Tinderbox <tinderbox@freebsd.org>, current@freebsd.org Subject: Re: [head tinderbox] failure on arm/arm Message-ID: <20061112142710.GE91556@wombat.fafoe.narf.at> In-Reply-To: <20061112140010.GA47660@rambler-co.ru> References: <20061112133929.9194773068@freebsd-current.sentex.ca> <20061112140010.GA47660@rambler-co.ru>
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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
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