[Bug bootstrap/61763] New: [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[Bug bootstrap/61763] New: [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[dougmencken at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

            Bug ID: 61763
           Summary: [4.9 Regression] gcc-4.9.0 "Bootstrap comparison
                    failure!"
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dougmencken at gmail dot com

I tried to bootstrap gcc-4.9.0 release on OS X 10.5 (darwin9).
My host compiler is currently gcc-4.8.3.

That's what I've got:

make "DESTDIR=" "RPATH_ENVVAR=DYLD_LIBRARY_PATH"
"TARGET_SUBDIR=powerpc-unknown-darwin" "bindir=/usr/bin" "datadir=/usr/share"
"exec_prefix=/usr" "includedir=/usr/include" "datarootdir=/usr/share"
"docdir=/usr/share/doc/" "infodir=/usr/share/info" "pdfdir=/usr/share/doc/"
"htmldir=/usr/share/doc/" "libdir=/usr/lib" "libexecdir=/usr/libexec"
"lispdir=" "localstatedir=/usr/var" "mandir=/usr/share/man"
"oldincludedir=/usr/include" "prefix=/usr" "sbindir=/usr/sbin"
"sharedstatedir=/usr/com" "sysconfdir=/etc"
"tooldir=/usr/powerpc-unknown-darwin"
"build_tooldir=/usr/powerpc-unknown-darwin"
"target_alias=powerpc-unknown-darwin" "AWK=awk" "BISON=bison"
"CC_FOR_BUILD=powerpc-unknown-darwin-gcc" "CFLAGS_FOR_BUILD=-O3"
"CXX_FOR_BUILD=powerpc-unknown-darwin-g++" "EXPECT=expect" "FLEX=flex"
"INSTALL=/usr/bin/install -c" "INSTALL_DATA=/usr/bin/install -c -m 644"
"INSTALL_PROGRAM=/usr/bin/install -c" "INSTALL_SCRIPT=/usr/bin/install -c"
"LDFLAGS_FOR_BUILD=" "LEX=flex" "M4=gm4" "MAKE=make" "RUNTEST=runtest"
"RUNTESTFLAGS=" "SED=/usr/bin/sed" "SHELL=/bin/sh" "YACC=bison -y" "`echo
'ADAFLAGS=' | sed -e s'/[^=][^=]*=$/XFOO=/'`" "ADA_CFLAGS=" "AR_FLAGS=rc"
"`echo 'BOOT_ADAFLAGS=-gnatpg' | sed -e s'/[^=][^=]*=$/XFOO=/'`"
"BOOT_CFLAGS=-O3 -mdynamic-no-pic" "BOOT_LDFLAGS=" "CFLAGS=-O3" "CXXFLAGS=-O3"
"LDFLAGS=" "LIBCFLAGS=-O3" "LIBCXXFLAGS=-O3 -fno-implicit-templates"
"STAGE1_CHECKING=--enable-checking=yes" "STAGE1_LANGUAGES=c,c++" "GNATBIND=no"
"GNATMAKE=no" "AR_FOR_TARGET=ar" "AS_FOR_TARGET=as"
"CC_FOR_TARGET=/Volumes/hfsplushd/Development/gcc-toolchain/_gcc_build/./gcc/xgcc
-B/Volumes/hfsplushd/Development/gcc-toolchain/_gcc_build/./gcc/"
"CFLAGS_FOR_TARGET=-O3" "CPPFLAGS_FOR_TARGET=" "CXXFLAGS_FOR_TARGET=-O3"
"DLLTOOL_FOR_TARGET=dlltool"
"FLAGS_FOR_TARGET=-B/usr/powerpc-unknown-darwin/bin/
-B/usr/powerpc-unknown-darwin/lib/ -isystem /usr/powerpc-unknown-darwin/include
-isystem /usr/powerpc-unknown-darwin/sys-include" "GCJ_FOR_TARGET="
"GFORTRAN_FOR_TARGET=" "GOC_FOR_TARGET=" "GOCFLAGS_FOR_TARGET=-O3"
"LD_FOR_TARGET=ld" "LIPO_FOR_TARGET=lipo" "LDFLAGS_FOR_TARGET="
"LIBCFLAGS_FOR_TARGET=-O3" "LIBCXXFLAGS_FOR_TARGET=-O3 -fno-implicit-templates"
"NM_FOR_TARGET=nm" "OBJDUMP_FOR_TARGET=objdump" "RANLIB_FOR_TARGET=ranlib"
"READELF_FOR_TARGET=readelf" "STRIP_FOR_TARGET=strip"
"WINDRES_FOR_TARGET=windres" "WINDMC_FOR_TARGET=windmc"
"BUILD_CONFIG=bootstrap-debug" "`echo 'LANGUAGES=' | sed -e
s'/[^=][^=]*=$/XFOO=/'`" "LEAN=false" "STAGE1_CFLAGS=-mdynamic-no-pic"
"STAGE1_CXXFLAGS=-mdynamic-no-pic" "STAGE1_TFLAGS=" "STAGE2_CFLAGS=-O3
-mdynamic-no-pic -gtoggle" "STAGE2_CXXFLAGS=-O3 -mdynamic-no-pic -gtoggle"
"STAGE2_TFLAGS=" "STAGE3_CFLAGS=-O3 -mdynamic-no-pic" "STAGE3_CXXFLAGS=-O3
-mdynamic-no-pic" "STAGE3_TFLAGS=" "STAGE4_CFLAGS=-O3 -mdynamic-no-pic"
"STAGE4_CXXFLAGS=-O3 -mdynamic-no-pic" "STAGE4_TFLAGS="
"STAGEprofile_CFLAGS=-O3 -mdynamic-no-pic -gtoggle -fprofile-generate"
"STAGEprofile_CXXFLAGS=-O3 -mdynamic-no-pic -gtoggle -fprofile-generate"
"STAGEprofile_TFLAGS=" "STAGEfeedback_CFLAGS=-O3 -mdynamic-no-pic
-fprofile-use" "STAGEfeedback_CXXFLAGS=-O3 -mdynamic-no-pic -fprofile-use"
"STAGEfeedback_TFLAGS=" "CXX_FOR_TARGET= $r/./gcc/xg++ -B$r/./gcc/ -nostdinc++
`if test -f $r/powerpc-unknown-darwin/libstdc++-v3/scripts/testsuite_flags;
then /bin/sh $r/powerpc-unknown-darwin/libstdc++-v3/scripts/testsuite_flags
--build-includes; else echo -funconfigured-libstdc++-v3 ; fi`
-L$r/powerpc-unknown-darwin/libstdc++-v3/src
-L$r/powerpc-unknown-darwin/libstdc++-v3/src/.libs
-L$r/powerpc-unknown-darwin/libstdc++-v3/libsupc++/.libs" "TFLAGS="
"CONFIG_SHELL=/bin/sh" "MAKEINFO=makeinfo --split-size=5000000
--split-size=5000000"  compare
rm -f stage_current
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/tree-loop-distribution.o differs
make[2]: *** [compare] Error 1
make[1]: *** [stage3-bubble] Error 2
make: *** [all] Error 2

gcc-4.8.3 bootstraps perfectly (both with -O2 and -O3) on my side.

[Bug bootstrap/61763] [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.9.1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you check a recent 4.9.1 snapshot?

[Bug bootstrap/61763] [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[dougmencken at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

--- Comment #2 from Douglas Mencken <dougmencken at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> Can you check a recent 4.9.1 snapshot?

Just did it. gcc-4.9-20140709 snapshot.

...
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Comparison successful.
...

So... Closing bug?

[Bug bootstrap/61763] [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.1                       |4.9.2

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.1 has been released.

[Bug bootstrap/61763] [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[dougmencken at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

--- Comment #4 from Douglas Mencken <dougmencken at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> GCC 4.9.1 has been released.

With 4.9.1 release I got:

...
rm -f stage_current
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
Bootstrap comparison failure!
gcc/gengtype.o differs
make[2]: *** [compare] Error 1
make[1]: *** [stage3-bubble] Error 2
make: *** [all] Error 2

[Bug bootstrap/61763] [4.9 Regression] gcc-4.9.0 "Bootstrap comparison failure!"

[dougmencken at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

--- Comment #5 from Douglas Mencken <dougmencken at gmail dot com> ---
Re-tried without forcing -O3, and with default -O2 4.9.1 doesn't complain on
stages 2&3 comparison.

[Bug bootstrap/61763] [4.9 Regression] gcc-4.9.0 4.9.1 "Bootstrap comparison failure!" when bootstrapping with -O3

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.2                       |4.9.3

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.2 has been released.

[Bug bootstrap/61763] [4.9 Regression] bootstrap with -O3 gives comparison failure

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-11-09
                 CC|                            |fxcoudert at gcc dot gnu.org
            Summary|[4.9 Regression] gcc-4.9.0  |[4.9 Regression] bootstrap
                   |4.9.1 "Bootstrap comparison |with -O3 gives comparison
                   |failure!" when              |failure
                   |bootstrapping with -O3      |
     Ever confirmed|0                           |1

--- Comment #7 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
I'm not sure what we want to do here… on one hand, bootstrapping with -O3 is
asking for trouble, but on the other hand I'm not sure it's explicitly
unsupported.
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Subject: [Bug rtl-optimization/63620] RELOAD lost SET_GOT dependency on Darwin
Date: Sun, 09 Nov 2014 19:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63620

--- Comment #28 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Vladimir Makarov from comment #27)
> Author: vmakarov
> Date: Sun Nov  9 16:45:15 2014
> New Revision: 217265

Unfortunately, the patch does not fix the "Reproducer for linux" testcase when
the patch from comment 19 is reverted.
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Subject: [Bug tree-optimization/63798] New: [5.0 regression] FAIL: gcc.target/powerpc/ppc-fmadd-1.c scan-assembler-not f(add|sub|mul|neg)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc798

            Bug ID: 63798
           Summary: [5.0 regression] FAIL:
                    gcc.target/powerpc/ppc-fmadd-1.c scan-assembler-not
                    f(add|sub|mul|neg)
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: rguenther at suse dot de
            Target: powerpc*-*-*

$ gcc/xgcc -Bgcc/ ../gcc/gcc/testsuite/gcc.target/powerpc/ppc-fmadd-1.c
-ffast-math -O2 -ffat-lto-objects -S -m32 -o ppc-fmadd-1.s && grep -Ec
"f(add|sub|mul|neg)" ppc-fmadd-1.s
4

f619ecaed41d1487091098a0f4fdf4d6ed1fa379 is the first bad commit
commit f619ecaed41d1487091098a0f4fdf4d6ed1fa379
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Mon Oct 27 11:30:23 2014 +0000

    2014-10-27  Richard Biener  <rguenther@suse.de>

        * tree-ssa-forwprop.c: Include tree-cfgcleanup.h and tree-into-ssa.h.
        (lattice): New global.
        (fwprop_ssa_val): New function.
        (fold_all_stmts): Likewise.
        (pass_forwprop::execute): Finally fold all stmts.

[Bug bootstrap/61763] [4.9 Regression] bootstrap with -O3 gives comparison failure

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Well, priority to fix this bug is certainly low unless you provide a smaller
testcase than "GCC bootstrap".  Does --without-build-config work?  Or do
you use --with-build-config=bootstrap-O3?

That is, how do you actually compile with -O3?

[Bug bootstrap/61763] [4.9 Regression] bootstrap with -O3 gives comparison failure

[dougmencken at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

--- Comment #9 from Douglas Mencken <dougmencken at gmail dot com> ---
>How do you actually compile with -O3?

../../flags_O2_to_O3.sh
sed -i '/ CFLAGS_FOR_TARGET=/{n;N;N;N;N;N;N;N;d}' ./configure.ac
sed -i '/ CXXFLAGS_FOR_TARGET=/{n;N;N;N;N;N;N;N;d}' ./configure.ac
sed -i 's/-c -g conftest/-c conftest/' ./configure.ac
sed -i 's/stage1_cflags="-g/stage1_cflags="/' ./configure.ac

Where flags_O2_to_O3.sh script is
http://ftp.osuosl.org/pub/manulix/scripts/service-scripts/flags_O2_to_O3.sh

[Bug bootstrap/61763] [4.9 Regression] bootstrap with -O3 gives comparison failure

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.3 has been released.

[Bug bootstrap/61763] [4.9 Regression] bootstrap with -O3 gives comparison failure

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61763

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.3                       |4.9.4