Compiling kernel with gcc43 [SOLVED]

[Mario Lobo]

On Thursday 01 April 2010 16:53:36 Pegasus Mc Cleaft wrote:
> On Thursday 01 April 2010 15:27:41 Oliver Fromme wrote:
> > Mario Lobo <lobo at bsd.com.br> wrote:
> >  > [...]
> >  > It's compiling right now.
> >  >
> >  > I'll post my findings and impressions on results and performance right
> >  > after the next reboot.
> >
> > So, how is it going?  Any benchmarks yet?  I'm curious
> > if the new gcc version will really make a significant
> > difference.
> 
> 	I would love to see the /etc/make.conf,  /etc/src.conf and
> /etc/libmap.conf files that were used for the build. I have tried compiling
>  in VBox a current kernel and world, but it usually just bombs out for me.
>  I would like to give this a go as well.
> 
> Peg
> 

Well, to tell the truth I wasn't that thrilled with the results. I didn't 
benchmark anything by my impressions were that at least disk access was a bit 
slower not only during booting but it was more noticeable to me particularly  
on a burning DVD session. Of course this is ultra abstract. 

In all previous experiences I had in burning CD/DVD with k3b, I recollect that 
during burning, the software buffer and device buffer gouges were always 100%, 
with the software buffer gouge dropping down occasionally to 89/92%.

After recompiling the kernel with gcc43, the software buffer was always empty 
and the device buffer rarely reached 40/50%. I think (if not mistaken) this 
means that the device is asking "where is my data??" and the OS is not 
providing it fast enough.

I could not get world to build with gcc43 so I gave that up. Then I moved on 
to VirtualBox. I managed to have it compiled and running. After long trial and 
error sessions, I could pin point what was breaking compilation and fixed it. 
Here are the steps:

------------------------------------------------------------------------------

Compiling vbox/vbox-devel with gcc43

1) /usr/include/cam/cam.h needed #include <stdio.h> for FILE define, 
complained by: 

 work/VirtualBox-3.1.51.r27657_OSE/src/VBox/Main/freebsd/HostHardwareFreeBSD.cpp:47:
 /usr/include/cam/cam.h:246: error: 'FILE' has not been declared

2)/usr/ports/emulators/virtualbox-
ose/work/VirtualBox-3.1.6_OSE/src/VBox/Main/generic/NetIf-generic.cpp 
  needed #include <stdio.h> because of popen() (this step is ONLY for 
virtualbox-ose)

3)/usr/ports/emulators/virtualbox-ose(-
devel)/work/VirtualBox-3.1.6_OSE/src/VBox/Main/freebsd/NetIf-freebsd.cpp 
  needed #include <stdlib.h> because of malloc()/free()

4) Config.kmk needed some tweaks:

  a) line 1750 - $(APPEND) '$@' 'VBOX_GCC_mtune-generic         ?= $(call 
VBOX_GCC_CHECK_CC,-mtune=amdfam10 -D__FreeBSD_cc_version=0,)' 
     to use instructions closer to Phenom and avoid cc complains.
  b) took out all references to "-fformat-extensions" and "-fno_format-
extensions"
  c) Preceeded all relevant locations of "/usr/lib \" with 
"/usr/local/lib/gcc43 \" so kbuild searched there for libraries first.
    (except TEMPLATE_VBOXQT4GUIEXE_LIBPATH !)

  d) You can use the same Config.kmk for building kmods as well

5) took out -fformat-extensions from src/sys/conf/kern.mk

And I left /etc/libmap.conf 

libgcc_s.so.1   gcc43/libgcc_s.so.1
libgomp.so.1    gcc43/libgomp.so.1
libobjc.so.3    gcc43/libobjc.so.2
libssp.so.0     gcc43/libssp.so.0
libstdc++.so.6  gcc43/libstdc++.so.6

/etc/make.conf 

CC=/usr/local/bin/gcc43
CXX=/usr/local/bin/g++43
CPP=/usr/local/bin/cpp43
CFLAGS+=-mssse3 -D__FreeBSD_cc_version=0
CXXFLAGS+=-D__FreeBSD_cc_version=0
CPUTYPE=amdfam10
#MAKEOPTS+= -j4


and /etc/src.conf

NO_WERROR=
WERROR=


------------------------------------------------------------------------------

New problems started to come when I tried to extend this to other ports, 
breaking a lot of them, to point of making me revert everything back to what 
it was. In fact I am still in this process right now, and reving a lot of 
problems to rebuild kde4.

This is it for now, guys. If you find anything new, please post.

Best of luck,

-- 
Mario Lobo
http://www.mallavoodoo.com.br
FreeBSD since version 2.2.8 [not Pro-Audio.... YET!!] (99,7% winfoes FREE)