[CFT]: ClangBSD is selfhosting, we need testers now
Alexander Best
alexbestms at wwu.de
Wed Apr 21 17:22:12 UTC 2010
Roman Divacky schrieb am 2010-04-21:
> On Wed, Apr 21, 2010 at 05:20:57PM +0200, Alexander Best wrote:
> > i might have stumbled upon a problem with clang. i've compiled a
> > kernel from
> > the clang branch using `make kernel INSTKERNNAME=clang` and booted
> > from it.
> > i'm now experiencing audio problems with mp3s and certain video
> > files.
> > playback is awfully slow and the audio output gets distorted
> > massively. `top`
> > however reports no high cpu load and `vmstat -i` doesn't report
> > anything
> > unusual either.
> > this problem doesn't occur with a regular gcc-kernel.
> > both kernels are running under a regular (gcc) world.
> > i thought it might be a problem with acpi, but disabling acpi
> > (hint.acpi.0.disabled=1) gives me a system freeze.
> I've heard about this problem but did not manage to reproduce that.
> can you try to bisect what file is being miscompiled? ie. compile
> half of the kernel with gcc and half with clang and bisect this
> way to a single file.
> we can work from there...
i've identified the problem to be somewhere in sys/dev/sound. i've removed
"device sound" and "device hda_snd" from my kernel config and
rebuild/reinstalled both kernels (gcc and clang). i then booted the clang
kernel and loaded various sound.ko and snd_hda.ko combination. here're the
results:
sound.ko (clang) snd_hda.ko (clang) => BROKEN
sound.ko (clang) snd_hda.ko (gcc) => BROKEN
sound.ko (gcc) snd_hda.ko (gcc) => OK
sound.ko (gcc) snd_hda.ko (clang) => OK
i've attached a log documenting all clang warnings that get issued when
building sys/modules/sound.
in addition to those warnings i get a lot of these, but i guess they aren't
harmful:
clang: warning: argument unused during compilation: '-funroll-loops'
clang: warning: argument unused during compilation: '-finline-limit=8000'
clang: warning: argument unused during compilation: '--param
inline-unit-growth=100'
clang: warning: argument unused during compilation: '--param
large-function-growth=1000'
clang: warning: argument unused during compilation: '-mfpmath=387'
clang: warning: argument unused during compilation: '-fformat-extensions'
clang: warning: argument unused during compilation: '-funroll-loops'
clang: warning: argument unused during compilation: '-finline-limit=8000'
clang: warning: argument unused during compilation: '--param
inline-unit-growth=100'
clang: warning: argument unused during compilation: '--param
large-function-growth=1000'
clang: warning: argument unused during compilation: '-mfpmath=387'
--
Alexander Best
-------------- next part --------------
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_rate.c:163:1: warning: initializing 'char const (*)[36]' discards qualifiers, expected 'void *' [-pedantic]
SYSCTL_STRING(_hw_snd, OID_AUTO, feeder_rate_presets, CTLFLAG_RD,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_rate.c:55:
In file included from @/dev/sound/pcm/sound.h:67:
@/sys/sysctl.h:243:2: note: instantiated from:
SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \
^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_rate.c:163:1: note: instantiated from:
SYSCTL_STRING(_hw_snd, OID_AUTO, feeder_rate_presets, CTLFLAG_RD,
^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_rate.c:164:5: note: instantiated from:
&feeder_rate_presets, 0, "compile-time rate presets");
^~~~~~~~~~~~~~~~~~~~
1 diagnostic generated.
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_eq.c:97:1: warning: initializing 'char const (*)[74]' discards qualifiers, expected 'void *' [-pedantic]
SYSCTL_STRING(_hw_snd, OID_AUTO, feeder_eq_presets, CTLFLAG_RD,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_eq.c:40:
In file included from @/dev/sound/pcm/sound.h:67:
@/sys/sysctl.h:243:2: note: instantiated from:
SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \
^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_eq.c:97:1: note: instantiated from:
SYSCTL_STRING(_hw_snd, OID_AUTO, feeder_eq_presets, CTLFLAG_RD,
^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/feeder_eq.c:98:5: note: instantiated from:
&feeder_eq_presets, 0, "compile-time eq presets");
^~~~~~~~~~~~~~~~~~
1 diagnostic generated.
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:73:1: warning: initializing 'char const (*)[17]' discards qualifiers, expected 'void *' [-pedantic]
SYSCTL_STRING(_hw_snd, OID_AUTO, version, CTLFLAG_RD, &snd_driver_version,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:34:
In file included from @/dev/sound/pcm/sound.h:67:
@/sys/sysctl.h:243:2: note: instantiated from:
SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \
^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:73:1: note: instantiated from:
SYSCTL_STRING(_hw_snd, OID_AUTO, version, CTLFLAG_RD, &snd_driver_version,
^ ~~~~~~~~~~~~~~~~~~~
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:73:55: note: instantiated from:
SYSCTL_STRING(_hw_snd, OID_AUTO, version, CTLFLAG_RD, &snd_driver_version,
^~~~~~~~~~~~~~~~~~~
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:85:19: warning: invalid conversion specifier 'b' [-Wformat]
SNDSTAT_PREPARE_PCM_END();
^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:38:
@/dev/sound/pcm/sndstat.h:69:34: note: instantiated from:
sbuf_printf(s, "snddev flags=0x%b", d->flags, SD_F_BITS); \
~~~~~~~~~~~~~~~~^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:85:2: warning: data argument not used by format string [-Wformat-extra-args]
SNDSTAT_PREPARE_PCM_END();
^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:38:
@/dev/sound/pcm/sndstat.h:69:48: note: instantiated from:
sbuf_printf(s, "snddev flags=0x%b", d->flags, SD_F_BITS); \
~~~~~~~~~~~~~~~~~~~ ^
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:34:
@/dev/sound/pcm/sound.h:167:20: note: instantiated from:
#define SD_F_BITS "\020" \
^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:85:20: warning: invalid conversion specifier 'b' [-Wformat]
SNDSTAT_PREPARE_PCM_END();
^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:38:
@/dev/sound/pcm/sndstat.h:125:36: note: instantiated from:
sbuf_printf(s, "channel flags=0x%b", c->flags, \
~~~~~~~~~~~~~~~~~^
/usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:85:2: warning: data argument not used by format string [-Wformat-extra-args]
SNDSTAT_PREPARE_PCM_END();
^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:38:
@/dev/sound/pcm/sndstat.h:126:7: note: instantiated from:
CHN_F_BITS); \
^
In file included from /usr/local/src/clangbsd/sys/modules/sound/sound/../../../dev/sound/pcm/sound.c:34:
In file included from @/dev/sound/pcm/sound.h:88:
@/dev/sound/pcm/channel.h:373:21: note: instantiated from:
#define CHN_F_BITS "\020" \
^
5 diagnostics generated.
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