[Bug bootstrap/18972] New: Regression: bootstrap failure of gcc-4.0-20041212 on OpenDarwin 7.2.1/x86 (i686-apple-darwin7.2.1): Bootstrap comparison failure

["lars dot sonchocky-helldorf at hamburg dot de" <gcc-bugzilla at gcc dot gnu dot org>]

The system:
===========

uname -a
Darwin localhost 7.2.1 Darwin Kernel Version 7.2.1: Wed Jul 14 03:00:02 
PDT 2004; root:tmp/xnu-7.2.1-1-root.obj/RELEASE_I386  x86 i386

gcc -v
Reading specs from /usr/libexec/gcc/darwin/i386/3.3/specs
Thread model: posix
gcc version 3.3 20030304 (Apple Computer, Inc. build 1495)


Prerequisites:
==============

# link libmx to libSystem

# this is necessary because some libraries are missing 
# from OpenDarwin, in this case the -lmx argument results in:
# /usr/bin/ld: can't locate file for: -lmx
# see http://www.opendarwin.org/bugzilla/show_bug.cgi?id=2194
#
# note: this is just enough to bootstrap the compiler, 
# some floating point compiliations might fail

sudo ln -s /usr/lib/libSystem.B.dylib /usr/lib/libmx.dylib

# install new cctools

# according to: http://gcc.gnu.org/ml/gcc-patches/2004-08/msg00104.html
# and: http://gcc.gnu.org/ml/gcc-patches/2004-10/msg01222.html
# newer cctools are needed to build HEAD of gcc
# Since building Apples cctools is somewhat complicated and
# won't work on (Open)Darwin/x86 better use OpenDarwin cctools (odcctools)
# see: http://www.opendarwin.org/projects/odcctools/
# and: http://www.opendarwin.org/projects/odcctools/usingodcctools.html 
# and: 
http://www.opendarwin.org/pipermail/odcctools/2004-October/000033.html

ftp http://www.opendarwin.org/downloads/odcctools-20041018.tar.bz2
tar -jxf odcctools-20041018.tar.bz2
mkdir odcctools-build
cd odcctools-build/
../odcctools-20041018/configure --prefix=/usr
make
sudo make install
cd ..


Bootstrapped like:
==================

# bootstrap the compiler

# note: those STAGE1_CFLAGS are needed to avoid
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14780

ftp 
ftp://gcc.gnu.org/pub/gcc/snapshots/4.0-20041212/gcc-4.0-20041212.tar.bz2
openssl md5 gcc-4.0-20041212.tar.bz2
tar -jxf gcc-4.0-20041212.tar.bz2
cd gcc-build/
rm -rf *
../gcc-4.0-20041212/configure --prefix=/tmp/gcc
make bootstrap STAGE1_CFLAGS="-no-cpp-precomp -Wa,-force_cpusubtype_ALL"



Result of attempted bootstrap:
==============================

Comparing stage2 and stage3 of the compiler
rm -f .bad_compare
case "gnucompare" in *compare | *compare-lean ) stage=2 ;; * ) stage=`echo 
gnucompare | sed -e 's,^[a-z]*compare\([0-9][0-9]*\).*,\1,'` ;; esac; \
for dir in . cp java objc build; do \
  if [ "`echo $dir/*.o`" != "$dir/*.o" ] ; then \
    for file in $dir/*.o; do \
      case "gnucompare" in \
        slowcompare* ) \
          tail +16c ./$file > tmp-foo1; \
          tail +16c stage$stage/$file > tmp-foo2 \
            && (cmp tmp-foo1 tmp-foo2 > /dev/null 2>&1 || echo $file 
differs >> .bad_compare) || true; \
          ;; \
        fastcompare* ) \
          cmp $file stage$stage/$file 16 16 > /dev/null 2>&1; \
          test $? -eq 1 && echo $file differs >> .bad_compare || true; \
          ;; \
        gnucompare* ) \
          cmp --ignore-initial=16 $file stage$stage/$file > /dev/null 
2>&1; \
          test $? -eq 1 && echo $file differs >> .bad_compare || true; \
          ;; \
      esac ; \
    done; \
  else true; fi; \
done
rm -f tmp-foo*
case "gnucompare" in *compare | *compare-lean ) stage=2 ;; * ) stage=`echo 
gnucompare | sed -e 's,^[a-z]*compare\([0-9][0-9]*\).*,\1,'` ;; esac; \
if [ -f .bad_compare ]; then \
  echo "Bootstrap comparison failure!"; \
  cat .bad_compare; \
  exit 1; \
else \
  case "gnucompare" in \
    *-lean ) rm -rf stage$stage ;; \
    *) ;; \
  esac; true; \
fi
Bootstrap comparison failure!
./reload.o differs
make[1]: *** [gnucompare] Error 1
make: *** [bootstrap] Error 2




This is a regression since bootstrap worked for 4.0.0 20041205. 
See: http://gcc.gnu.org/ml/gcc-testresults/2004-12/msg00276.html


Steps taken to isolate the bug
==============================

the only occurrences of reload.o during bootstrapping were:

gcc -c   -no-cpp-precomp -Wa,-force_cpusubtype_ALL -DENABLE_CHECKING -
DENABLE_ASSERT_CHECKING -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-
prototypes  -fno-common   -DHAVE_CONFIG_H    -I. -I. -I../../gcc-4.0-20041212/gcc -I../../gcc-4.0-
20041212/gcc/. -I../../gcc-4.0-20041212/gcc/../include -I./../intl -I../../gcc-4.0-20041212/gcc/../
libcpp/include  ../../gcc-4.0-20041212/gcc/reload.c -o reload.o

stage1/xgcc -Bstage1/ -B/tmp/gcc/i686-apple-darwin7.2.1/bin/ -c   -O2 -g -fomit-frame-pointer -
DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-
long -Wno-variadic-macros -Wold-style-definition -Werror -fno-common   -DHAVE_CONFIG_H    -I. -
I. -I../../gcc-4.0-20041212/gcc -I../../gcc-4.0-20041212/gcc/. -I../../gcc-4.0-20041212/gcc/../
include -I./../intl -I../../gcc-4.0-20041212/gcc/../libcpp/include  ../../gcc-4.0-20041212/gcc/
reload.c -o reload.o

stage2/xgcc -Bstage2/ -B/tmp/gcc/i686-apple-darwin7.2.1/bin/ -c   -O2 -g -fomit-frame-pointer -
DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-
long -Wno-variadic-macros -Wold-style-definition -Werror -fno-common   -DHAVE_CONFIG_H    -I. -
I. -I../../gcc-4.0-20041212/gcc -I../../gcc-4.0-20041212/gcc/. -I../../gcc-4.0-20041212/gcc/../
include -I./../intl -I../../gcc-4.0-20041212/gcc/../libcpp/include  ../../gcc-4.0-20041212/gcc/
reload.c -o reload.o

whereby the last both commands differ only in the compiler that's used, at first stage1/xgcc and later 
stage2/xgcc. Those commands were the ones which results differed in the comparison, so I reissued 
them (in the gcc subdirectory) with a '-save-temps' option added:

localhost:~/GCC/FSF/gcc-build/gcc lars$ stage1/xgcc -Bstage1/ -B/tmp/gcc/i686-apple-
darwin7.2.1/bin/ -c   -O2 -g -fomit-frame-pointer -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-
prototypes -Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros -Wold-style-
definition -Werror -fno-common   -DHAVE_CONFIG_H    -I. -I. -I../../gcc-4.0-20041212/gcc -I../../
gcc-4.0-20041212/gcc/. -I../../gcc-4.0-20041212/gcc/../include -I./../intl -I../../gcc-4.0-
20041212/gcc/../libcpp/include -save-temps ../../gcc-4.0-20041212/gcc/reload.c -o reload.o
localhost:~/GCC/FSF/gcc-build/gcc lars$ mv reload.i stage2-reload.i
localhost:~/GCC/FSF/gcc-build/gcc lars$ mv reload.s stage2-reload.s
localhost:~/GCC/FSF/gcc-build/gcc lars$ stage2/xgcc -Bstage2/ -B/tmp/gcc/i686-apple-
darwin7.2.1/bin/ -c   -O2 -g -fomit-frame-pointer -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-
prototypes -Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros -Wold-style-
definition -Werror -fno-common   -DHAVE_CONFIG_H    -I. -I. -I../../gcc-4.0-20041212/gcc -I../../
gcc-4.0-20041212/gcc/. -I../../gcc-4.0-20041212/gcc/../include -I./../intl -I../../gcc-4.0-
20041212/gcc/../libcpp/include -save-temps ../../gcc-4.0-20041212/gcc/reload.c -o reload.o
localhost:~/GCC/FSF/gcc-build/gcc lars$ mv reload.i stage3-reload.i
localhost:~/GCC/FSF/gcc-build/gcc lars$ mv reload.s stage3-reload.s

I found out that the .i files and .s files don't differ, so I attached them only once

regards, Lars

-- 
           Summary: Regression: bootstrap failure of gcc-4.0-20041212 on
                    OpenDarwin 7.2.1/x86 (i686-apple-darwin7.2.1): Bootstrap
                    comparison failure
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: lars dot sonchocky-helldorf at hamburg dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-apple-darwin7.2.1
  GCC host triplet: i686-apple-darwin7.2.1
GCC target triplet: i686-apple-darwin7.2.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18972