[Bug bootstrap/46050] New: gcc/c-parser.c fails to build with -O2 -finline-functions

[Bug bootstrap/46050] New: gcc/c-parser.c fails to build with -O2 -finline-functions

[baryluk at smp dot if.uj.edu.pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46050

           Summary: gcc/c-parser.c fails to build with -O2
                    -finline-functions
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: baryluk@smp.if.uj.edu.pl


gcc-4.6-20101009 snapshot. I think it was working in previous snapshot (there
were other errors, but this no). With only -O2 build is ok. So inlineing is a
problem?



root@tytus:/scratch/obiekty# export FLAGS="-O2 -finline-functions"
root@tytus:/scratch/obiekty# export CFLAGS=$FLAGS
root@tytus:/scratch/obiekty# export CXXFLAGS=$FLAGS
root@tytus:/scratch/obiekty#  /scratch/gcc-4.6-20101009/configure \
    --enable-languages=c,c++,java \
    --enable-checking=yes \
    CFLAGS="$CFLAGS" CXXFLAGS="$CXXFLAGS"
root@tytus:/scratch/obiekty# make "BOOT_CFLAGS=$CFLAGS" bootstrap


...

/scratch/obiekty/./prev-gcc/xgcc -B/scratch/obiekty/./prev-gcc/
-B/usr/local/i686-pc-linux-gnu/bin/ -B/usr/local/i686-pc-linux-gnu/bin/
-B/usr/local/i686-pc-linux-gnu/lib/ -isystem
/usr/local/i686-pc-linux-gnu/include -isystem
/usr/local/i686-pc-linux-gnu/sys-include    -c  -DIN_GCC_FRONTEND -O2
-finline-functions -gtoggle -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual
-Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-Wold-style-definition -Wc++-compat -fno-common  -DHAVE_CONFIG_H -I. -I.
-I/scratch/gcc-4.6-20101009/gcc -I/scratch/gcc-4.6-20101009/gcc/.
-I/scratch/gcc-4.6-20101009/gcc/../include
-I/scratch/gcc-4.6-20101009/gcc/../libcpp/include 
-I/scratch/gcc-4.6-20101009/gcc/../libdecnumber
-I/scratch/gcc-4.6-20101009/gcc/../libdecnumber/bid -I../libdecnumber 
-DCLOOG_PPL_BACKEND  -I/usr/include/libelf 
/scratch/gcc-4.6-20101009/gcc/c-parser.c -o c-parser.o
/scratch/gcc-4.6-20101009/gcc/c-parser.c: In function
‘c_parser_statement_after_labels’:
/scratch/gcc-4.6-20101009/gcc/c-parser.c:4672:19: error: ‘incr’ may be used
uninitialized in this function [-Werror=uninitialized]
/scratch/gcc-4.6-20101009/gcc/c-parser.c:4525:21: note: ‘incr’ was declared
here
cc1: all warnings being treated as errors

make[3]: *** [c-parser.o] Błąd 1
make[3]: Opuszczenie katalogu `/scratch/obiekty/gcc'
make[2]: *** [all-stage2-gcc] Błąd 2
make[2]: Opuszczenie katalogu `/scratch/obiekty'
make[1]: *** [stage2-bubble] Błąd 2
make[1]: Opuszczenie katalogu `/scratch/obiekty'
make: *** [bootstrap] Błąd 2
root@tytus:/scratch/obiekty#


Thanks.

[Bug bootstrap/46050] gcc/c-parser.c fails to build with -O2 -finline-functions

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46050

--- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2010-10-16 16:23:14 UTC ---
Created attachment 22063
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22063
move some initializations

Does attached patch fix the failure for you?

[Bug bootstrap/46050] gcc/c-parser.c fails to build with -O2 -finline-functions

[baryluk at smp dot if.uj.edu.pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46050

--- Comment #2 from Witold Baryluk <baryluk at smp dot if.uj.edu.pl> 2010-10-17 12:16:25 UTC ---
Not exactly your patch. In true-branch of if, there is no assigment to incr (so
error is correct).

But moving else assigments, before if, resolves problem. Modified patch agains
snapshot 20101009 attached.

If you have been genereting against SVN trunk, that it is possible that it is
already fixed there (as comment in your patch indicates also).

[Bug bootstrap/46050] gcc/c-parser.c fails to build with -O2 -finline-functions

[baryluk at smp dot if.uj.edu.pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46050

--- Comment #3 from Witold Baryluk <baryluk at smp dot if.uj.edu.pl> 2010-10-17 12:18:15 UTC ---
Created attachment 22069
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22069
Move initializations patch of incr and cond (against gcc-4.6-20101009)

[Bug bootstrap/46050] gcc/c-parser.c fails to build with -O2 -finline-functions

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46050

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Uros Bizjak <ubizjak at gmail dot com> 2010-10-17 18:00:58 UTC ---
(In reply to comment #2)
> Not exactly your patch. In true-branch of if, there is no assigment to incr (so
> error is correct).
> 
> But moving else assigments, before if, resolves problem. Modified patch agains
> snapshot 20101009 attached.
> 
> If you have been genereting against SVN trunk, that it is possible that it is
> already fixed there (as comment in your patch indicates also).

Yeah, my patch was against latest SVN trunk. But anyway, an assignment in both
arms on an if can surely be CSE'd out of the "if" entirely.

So, fixed in latest SVN.