[Vm-dev] linux build stability

[David T. Lewis]

On Tue, Feb 01, 2011 at 10:17:35PM -0800, Eliot Miranda wrote:
> 
> I wonder
> - do you see the same effect?
> - does this happen with gcc versions other than 4.1.2?
> - does it happen on non-RHEL-derived distros?

Yes, yes, and yes. I get similar results reproducing your tests on
SuSE 64, gcc 4.5.0 (see below).

> - is this a meaningful signal or just harmless noise?

Given that the following are all identical I would somewhat favor
the harmless noise theory:
  vm/sqTicker.o
  vm/gcc3x-cointerp.o
  vm/sqTicker.o
  vm/sqUnixMemory.o
  vm/sqUnixThreads.o
  vm/sqUnixVMProfile.o

Test results on my system:

$ uname -a
Linux linux-jh8m 2.6.34.7-0.7-desktop #1 SMP PREEMPT 2010-12-13 11:13:53 +0100 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/version
Linux version 2.6.34.7-0.7-desktop (geeko at buildhost) (gcc version 4.5.0 20100604 [gcc-4_5-branch revision 160292] (SUSE Linux) ) #1 SMP PREEMPT 2010-12-13 11:13:53 +0100
$  gcc --version
gcc (SUSE Linux) 4.5.0 20100604 [gcc-4_5-branch revision 160292]
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The configuration is:
../../platforms/unix/config/configure CC="gcc -m32" CFLAGS="-g -O2 -msse2 -D_GNU_SOURCE -DNDEBUG -DITIMER_HEARTBEAT=1 -DNO_VM_PROFILE=1 -DCOGMTVM=0 -DDEBUGVM=0" LDFLAGS="-m32" LIBS=-lpthread

I manually edited ALSA out of the Makefiles (libtool problem, probably missing the 32-bit libraries).

Generated new sources from using image/VMMaker-Squeak4.1.image (from SVN).

Built three times in blda, bldb, bldc with the same configure/make.

Ran script from blda:
for f in *.o vm/*.o
do
  echo $f
  cmp $f ../bldb/$f
  cmp $f ../bldc/$f
done

Results:
disabledPlugins.o
disabledPlugins.o ../bldb/disabledPlugins.o differ: byte 197, line 4
disabledPlugins.o ../bldc/disabledPlugins.o differ: byte 197, line 4
version.o
version.o ../bldb/version.o differ: byte 158, line 2
version.o ../bldc/version.o differ: byte 158, line 2
vm/aio.o
vm/cogit.o
vm/debug.o
vm/debug.o ../bldb/vm/debug.o differ: byte 776, line 8
vm/debug.o ../bldc/vm/debug.o differ: byte 776, line 8
vm/gcc3x-cointerp.o
vm/osExports.o
vm/sqExternalSemaphores.o
vm/sqHeapMap.o
vm/sqHeapMap.o ../bldb/vm/sqHeapMap.o differ: byte 2400, line 7
vm/sqHeapMap.o ../bldc/vm/sqHeapMap.o differ: byte 803, line 5
vm/sqNamedPrims.o
vm/sqNamedPrims.o ../bldb/vm/sqNamedPrims.o differ: byte 7343, line 21
vm/sqNamedPrims.o ../bldc/vm/sqNamedPrims.o differ: byte 7343, line 21
vm/sqTicker.o
vm/sqUnixCharConv.o
vm/sqUnixCharConv.o ../bldb/vm/sqUnixCharConv.o differ: byte 2804, line 20
vm/sqUnixCharConv.o ../bldc/vm/sqUnixCharConv.o differ: byte 2804, line 20
vm/sqUnixExternalPrims.o
vm/sqUnixHeartbeat.o
vm/sqUnixMain.o
vm/sqUnixMain.o ../bldb/vm/sqUnixMain.o differ: byte 12285, line 46
vm/sqUnixMain.o ../bldc/vm/sqUnixMain.o differ: byte 12294, line 46
vm/sqUnixMemory.o
vm/sqUnixThreads.o
vm/sqUnixVMProfile.o
vm/sqVirtualMachine.o