Date: Sun, 12 Nov 2006 17:46:18 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: FreeBSD Tinderbox <tinderbox@freebsd.org>, arm@freebsd.org, current@freebsd.org Subject: Re: [head tinderbox] failure on arm/arm Message-ID: <20061112144618.GB49703@rambler-co.ru> In-Reply-To: <20061112142710.GE91556@wombat.fafoe.narf.at> References: <20061112133929.9194773068@freebsd-current.sentex.ca> <20061112140010.GA47660@rambler-co.ru> <20061112142710.GE91556@wombat.fafoe.narf.at>
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On Sun, Nov 12, 2006 at 03:27:10PM +0100, Stefan Farfeleder wrote:
> 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_TE=
ST_HOOKS=3D1 -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-p=
arameter -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_TE=
ST_HOOKS=3D1 -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-p=
arameter -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_TE=
ST_HOOKS=3D1 -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-p=
arameter -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_TE=
ST_HOOKS=3D1 -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-p=
arameter -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_TE=
ST_HOOKS=3D1 -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-p=
arameter -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_TE=
ST_HOOKS=3D1 -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-p=
arameter -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 align=
ment of target type
> > > *** Error code 1
> > >=20
> > > Stop in /src/lib/libelf.
> > > *** Error code 1
> > >=20
> > 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:
> >=20
> > %%%
> > $ cat a.c
> > struct foo {
> > char x;
> > };
> >=20
> > struct foo *
> > bubu(char *s)
> > {
> >=20
> > 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
> > %%%
> >=20
> > (None of other supported architecutes see the issue here.)
>=20
> What is sizeof(struct foo)? If it's > 1 it makes sense.
>=20
Yes, it's four bytes on ARM. But why?
Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer
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