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rhill
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PostPosted: Wed May 12, 2010 2:40 am    Post subject: Reply with quote

Colt45 wrote:
binutils is failing the same way. For some reason it feels the need to strip my -mno-movbe out of CFLAGS. Any ideas how to force it to take that CFLAG?


This should work now, I added the new -mno-* flags to the strip-flags exception list last weekish.

I haven't tried LTO yet. I'm waiting for proper libtool support. Any success stories?
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Genewb
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PostPosted: Wed May 12, 2010 2:24 pm    Post subject: Reply with quote

cruzki123 wrote:
What problems will I have with -lto enable build? Have anyone a list of "problematic" packages?
[...]

There are relatively few packages that fail. The list I gave earlier in the thread was based on appending -flto to LDFLAGS, which isn't necessary (this results in error to the effect of 'invalid lto mode').

Two other types of error are ${path}/${name}.lto.o not found (Makefile error?) and some sort of wrong-order problem (to the effect of 'future versions of POSIX will require...').

libtool doesn't fail as such, but for some reason gnome-panel uses a symbol in libtool which is for some reason removed by lto.

Most packages are fine with whole-program, ipa-matrix-reorg and ipa-struct-reorg too. whole-program is ignored for shared libraries.

An example of a package which doesn't like whole-program is gnome-settings-daemon (modules require symbols from the main programme), which doesn't run after compilation.

Build failures caused by whole-program end with a barrage of 'undefined' errors.
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ComaWhite
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PostPosted: Fri May 14, 2010 6:10 am    Post subject: Reply with quote

I've ran in to some issues. So far for me what breaks is

* mysql 5.1.46 fails to compile
* qt-core 4.7.9999 :(
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PuckPoltergeist
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PostPosted: Fri May 14, 2010 10:40 am    Post subject: Reply with quote

On compiling krita I get an ICE:
Code:

[ 70%] Building CXX object krita/plugins/extensions/tonemapping/CMakeFiles/kritatonemapping.dir/operators/trilateral/tmo_trilateral.o
[ 70%] Built target kritadefaultdockers
In file included from /var/tmp/portage/app-office/krita-2.1.2/work/krita-2.1.2/krita/plugins/extensions/tonemapping/operators/trilateral/tmo_trilateral.cpp:54:0:
/var/tmp/portage/app-office/krita-2.1.2/work/krita-2.1.2/krita/plugins/extensions/tonemapping/operators/trilateral/memory.h: In function 'double build_stack(double**, double**, double***, double***, int, double)':
/var/tmp/portage/app-office/krita-2.1.2/work/krita-2.1.2/krita/plugins/extensions/tonemapping/operators/trilateral/memory.h:100:8: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.
make[2]: *** [krita/plugins/extensions/tonemapping/CMakeFiles/kritatonemapping.dir/operators/trilateral/tmo_trilateral.o] Error 1
make[1]: *** [krita/plugins/extensions/tonemapping/CMakeFiles/kritatonemapping.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
Scanning dependencies of target kritasmallcolorselector
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/kritasmallcolorselector_automoc.o
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/smallcolorselector.o
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/smallcolorselector_dock.o
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/kis_small_color_widget.o
Linking CXX shared module ../../../../../lib/kritasmallcolorselector.so
[ 70%] Built target kritasmallcolorselector
make: *** [all] Error 2

Will try if this is CFLAGS-related. I'm using a very heavy mixture here:
Code:

CFLAGS="-O2 -march=atom -mfpmath=sse -fweb -ftracer -funswitch-loops -fpredictive-commoning -fgcse-after-reload -ftree-vectorize -fomit-frame-pointer -fgraphite-identity -ftree-loop-distribution -ftree-loop-im -fvect-cost-model -pipe"
CXXFLAGS="${CFLAGS}"

LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,-z,combreloc"

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Genewb
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PostPosted: Sun May 16, 2010 1:12 pm    Post subject: Reply with quote

PuckPoltergeist wrote:
On compiling krita I get an ICE:
Will try if this is CFLAGS-related. I'm using a very heavy mixture here:
Code:

CFLAGS="-O2 -march=atom -mfpmath=sse -fweb -ftracer -funswitch-loops -fpredictive-commoning -fgcse-after-reload -ftree-vectorize -fomit-frame-pointer -fgraphite-identity -ftree-loop-distribution -ftree-loop-im -fvect-cost-model -pipe"
CXXFLAGS="${CFLAGS}"

LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,-z,combreloc"

vect-cost-model is enabled by default and IIRC, combreloc is too.
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Genewb
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PostPosted: Sun May 16, 2010 4:02 pm    Post subject: Reply with quote

cruzki123 wrote:
EDIT: Don't try to compile a kernel with gcc-4.5. Compile fine, but when udev it is trying to do it's magic you obtain a nice kernel panic.

I've hit this with 2.6.34 (but not 2.6.33). init segfaults, kernel tries to kill init and oopses.

Compiling with O2 instead of Os stops init from segfaulting, but sh fails to allocate memory when compiling anything and segfaults, which makes it sort of useless.

Here's the relevant tracker ticket, I think.
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PuckPoltergeist
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PostPosted: Sun May 16, 2010 8:42 pm    Post subject: Reply with quote

Genewb wrote:
PuckPoltergeist wrote:
On compiling krita I get an ICE:
Will try if this is CFLAGS-related. I'm using a very heavy mixture here:
Code:

CFLAGS="-O2 -march=atom -mfpmath=sse -fweb -ftracer -funswitch-loops -fpredictive-commoning -fgcse-after-reload -ftree-vectorize -fomit-frame-pointer -fgraphite-identity -ftree-loop-distribution -ftree-loop-im -fvect-cost-model -pipe"
CXXFLAGS="${CFLAGS}"

LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,-z,combreloc"

vect-cost-model is enabled by default and IIRC, combreloc is too.

By Gentoo or by gcc? At least the first one isn't mentioned this way in the docs.
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PuckPoltergeist
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PostPosted: Sun May 16, 2010 8:43 pm    Post subject: Reply with quote

Genewb wrote:
cruzki123 wrote:
EDIT: Don't try to compile a kernel with gcc-4.5. Compile fine, but when udev it is trying to do it's magic you obtain a nice kernel panic.

I've hit this with 2.6.34 (but not 2.6.33). init segfaults, kernel tries to kill init and oopses.

Compiling with O2 instead of Os stops init from segfaulting, but sh fails to allocate memory when compiling anything and segfaults, which makes it sort of useless.

Here's the relevant tracker ticket, I think.

Can't confirm this. I'm using 2.6.34-rc7 with gcc-4.5 and CPU type atom here with no problems.
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Genewb
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PostPosted: Sun May 16, 2010 9:11 pm    Post subject: Reply with quote

PuckPoltergeist wrote:

By Gentoo or by gcc? At least the first one isn't mentioned this way in the docs.

by gcc. The docs aren't always up to date.
Code:

cc -O2 -Q --help=optimizers | grep cost
  -fvect-cost-model                 [enabled]

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Genewb
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PostPosted: Sun May 16, 2010 9:46 pm    Post subject: Reply with quote

PuckPoltergeist wrote:

Can't confirm this. I'm using 2.6.34-rc7 with gcc-4.5 and CPU type atom here with no problems.

64 or 32 bit and have you compiled system world with 4.5?
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rhill
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PostPosted: Sun May 16, 2010 10:03 pm    Post subject: Reply with quote

Are you using -Os? (CONFIG_CC_OPTIMIZE_FOR_SIZE)
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Genewb
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PostPosted: Sun May 16, 2010 10:11 pm    Post subject: Reply with quote

dirtyepic wrote:
Are you using -Os? (CONFIG_CC_OPTIMIZE_FOR_SIZE)

In case you're asking me, I've tried with and without. Last time I tested, no.

This is what happens when trying to build something:
Code:

>>> Compiling source in /var/tmp/portage/x11-libs/cairo-1.8.8-r1/work/cairo-1.8.8 ...
make -j6
/bin/sh: xmalloc: hashlib.c:264: cannot allocate 32 bytes (98304 bytes allocated)
make: *** [config.h] Segmentation

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PuckPoltergeist
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PostPosted: Sun May 16, 2010 11:27 pm    Post subject: Reply with quote

dirtyepic wrote:
Are you using -Os? (CONFIG_CC_OPTIMIZE_FOR_SIZE)

Yes I do so, but I've didn't compiled "world" with gcc-4.5.0
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PuckPoltergeist
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PostPosted: Sun May 16, 2010 11:31 pm    Post subject: Reply with quote

Genewb wrote:
PuckPoltergeist wrote:

By Gentoo or by gcc? At least the first one isn't mentioned this way in the docs.

by gcc. The docs aren't always up to date.
Code:

cc -O2 -Q --help=optimizers | grep cost
  -fvect-cost-model                 [enabled]


Thanks, I wasn't aware of this. :D
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mack1
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PostPosted: Mon May 17, 2010 12:29 pm    Post subject: Reply with quote

What is the right way to enable lto globally?
It is suitable to rebuild "world"?


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Shining Arcanine
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PostPosted: Mon May 17, 2010 12:57 pm    Post subject: Reply with quote

mack1 wrote:
What is the right way to enable lto globally?
It is suitable to rebuild "world"?


Cheers


emerge --jobs --keep-going -ave world
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tranquilcool
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PostPosted: Mon May 17, 2010 2:11 pm    Post subject: Reply with quote

Shining Arcanine wrote:
mack1 wrote:
What is the right way to enable lto globally?
It is suitable to rebuild "world"?


Cheers


emerge --jobs --keep-going -ave world


i think the question was if lto could be used globally.
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mack1
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PostPosted: Mon May 17, 2010 3:05 pm    Post subject: Reply with quote

@tranquilcool yes, you are right :D !

Thanks
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tranquilcool
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PostPosted: Mon May 17, 2010 3:07 pm    Post subject: Reply with quote

mack1 wrote:
@tranquilcool yes, you are right :D !

Thanks


i tried it but too many packages failed to build. i think
we have to wait.
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PostPosted: Mon May 17, 2010 3:20 pm    Post subject: Reply with quote

Ok, thanks for the information!
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PuckPoltergeist
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PostPosted: Mon May 17, 2010 8:52 pm    Post subject: Reply with quote

PuckPoltergeist wrote:
On compiling krita I get an ICE:
Code:

[ 70%] Building CXX object krita/plugins/extensions/tonemapping/CMakeFiles/kritatonemapping.dir/operators/trilateral/tmo_trilateral.o
[ 70%] Built target kritadefaultdockers
In file included from /var/tmp/portage/app-office/krita-2.1.2/work/krita-2.1.2/krita/plugins/extensions/tonemapping/operators/trilateral/tmo_trilateral.cpp:54:0:
/var/tmp/portage/app-office/krita-2.1.2/work/krita-2.1.2/krita/plugins/extensions/tonemapping/operators/trilateral/memory.h: In function 'double build_stack(double**, double**, double***, double***, int, double)':
/var/tmp/portage/app-office/krita-2.1.2/work/krita-2.1.2/krita/plugins/extensions/tonemapping/operators/trilateral/memory.h:100:8: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.
make[2]: *** [krita/plugins/extensions/tonemapping/CMakeFiles/kritatonemapping.dir/operators/trilateral/tmo_trilateral.o] Error 1
make[1]: *** [krita/plugins/extensions/tonemapping/CMakeFiles/kritatonemapping.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
Scanning dependencies of target kritasmallcolorselector
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/kritasmallcolorselector_automoc.o
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/smallcolorselector.o
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/smallcolorselector_dock.o
[ 70%] Building CXX object krita/plugins/extensions/dockers/smallcolorselector/CMakeFiles/kritasmallcolorselector.dir/kis_small_color_widget.o
Linking CXX shared module ../../../../../lib/kritasmallcolorselector.so
[ 70%] Built target kritasmallcolorselector
make: *** [all] Error 2

Will try if this is CFLAGS-related. I'm using a very heavy mixture here:
Code:

CFLAGS="-O2 -march=atom -mfpmath=sse -fweb -ftracer -funswitch-loops -fpredictive-commoning -fgcse-after-reload -ftree-vectorize -fomit-frame-pointer -fgraphite-identity -ftree-loop-distribution -ftree-loop-im -fvect-cost-model -pipe"
CXXFLAGS="${CFLAGS}"

LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,-z,combreloc"


Yes it is CFLAGS-related. -fgraphite-identit is the one that causes the segfault. :evil:
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PuckPoltergeist
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PostPosted: Fri May 21, 2010 9:52 pm    Post subject: Reply with quote

Compiling OpenOffice with gcc-4.5 gives also an ICE. And again -fgraphite-identity is responsible. Seems it is still not mature enough. :(
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PostPosted: Tue Jun 01, 2010 8:05 pm    Post subject: Reply with quote

I'm also trying out the new link time optimization, but I'm having some trouble.
In particular I want to try to compile ffmpeg & mplayer with lto. It seems some
people have managed to compile ffmpeg (Genewb), while others report that it
fails to compile (cruzki123).
So my question is, did anyone (and if so, how?) manage to compile ffmpeg?

What I have done is to create a file like such:
/etc/portage/env/media-video/ffmpeg:
CFLAGS="${CFLAGS} -flto -flto-report"
LDFLAGS="${CFLAGS} -Wl,-flto,--as-needed"
and then attempt to emerge ffmpeg.
However this fails with lots of undefined references. However compiling media-libs/x264
using the same approach does work as expected.
One thing I am not sure about is setting CFLAGS as LDFLAGS (the second line of
/etc/portage/env/media-video/ffmpeg), however without this the compilation aborts
at link time with 'error: invalid LTO mode'.
Is this the proper way to set LDFLAGS for link time optimization?

Also, can anyone please explain how to use -fwhopr? Is it just a matter of replacing
'lto' with 'whopr' everywhere? I.e. does it need to be specified at the linking stage also,
or do I then use only lto? Or do you always need to specify both -flto and -fwhopr?
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Genewb
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PostPosted: Tue Jun 01, 2010 9:58 pm    Post subject: Reply with quote

Da Fox wrote:

One thing I am not sure about is setting CFLAGS as LDFLAGS (the second line of
/etc/portage/env/media-video/ffmpeg), however without this the compilation aborts
at link time with 'error: invalid LTO mode'.
Is this the proper way to set LDFLAGS for link time optimization?

No, no LDFLAGS are required for lto.

Da Fox wrote:

Also, can anyone please explain how to use -fwhopr? Is it just a matter of replacing
'lto' with 'whopr' everywhere? I.e. does it need to be specified at the linking stage also,
or do I then use only lto? Or do you always need to specify both -flto and -fwhopr?

Just -fwhopr.
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cruzki123
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PostPosted: Wed Jun 02, 2010 6:34 am    Post subject: Reply with quote

/etc/portage/env/media-video/ffmpeg:
CFLAGS="${CFLAGS} -flto -flto-report"
LDFLAGS="${CFLAGS} -Wl,-flto,--as-needed"


I think that you have a typo here. Is LDFLAGS="${_LD_FLAGS} -Wl,-flto,--as-needed" (without _)
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