Hello,
> On Mon, 2006-06-19 at 12:31 -0400, Andrew MacLeod wrote:
> > OK, so I wasn't just wacko last week. Mainline fails to build on Fedora
> > Core 4 (with all the latest updates, kernel 2111) when built with
> > checking disabled. Diego verified this on a second FC4 box.
> >
>
> I've narrowed this down to the patch in revision 114674. (114673 works
> fine, 114674 exhibits the problem)
>
> ------------------------------------------------------------------------
> r114674 | rakdver | 2006-06-15 05:42:03 -0400 (Thu, 15 Jun 2006) | 10 lines
>
> * tree-ssa-loop-niter.c (implies_nonnegative_p): New function.
> (derive_constant_upper_bound): Derive more precise upper bound in
> common cases. Return type changed to double_int.
> (record_estimate): Reflect the changed return type of
> derive_constant_upper_bound.
> * double-int.c (double_int_zext, double_int_sext): Fix.
>
> * gcc.dg/tree-ssa/loop-18.c: New test.
>
>
>
> bitmap.o in stage 2 is miscompiled by the stage 1 compiler. If I replace
> bitmap.o with the bitmap.o produced by the stage 2 compiler from rev.
> 114673, everything proceeds and we get a failure in stage3.
>
> Thats as far as I've gotten today.
does this still fail? I have fixed one misscompilation due to this
patch yesterday:
2006-06-19 Zdenek Dvorak <[EMAIL PROTECTED]>
* tree-ssa-loop-niter.c (implies_ge_p): New function.
(derive_constant_upper_bound): Handle OP0 - CST in unsigned types
correctly.
> PS. The only configure options are --enable-languages=c,c++
> --disable-checking
>
> > The compile fails when building crtfastmath during stage2.
> >
> > It doesn't happen when checking is enabled, nor does it happen on FC5
> > under any circumstance I have found.
> >
> >
> > /build/gcc/2006-06-19-nc/./gcc/xgcc -B/build/gcc/2006-06-19-nc/./gcc/
> > -B/install/gcc-nc/i686-pc-linux-gnu/bin/
> > -B/install/gcc-nc/i686-pc-linux-gnu/lib/ -isystem
> > /install/gcc-nc/i686-pc-linux-gnu/include -isystem
> > /install/gcc-nc/i686-pc-linux-gnu/sys-include -O2 -O2 -g -O2 -DIN_GCC
> > -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
> > -Wold-style-definition -isystem ./include -fPIC -g -DHAVE_GTHR_DEFAULT
> > -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -msse -c \
> > /src/gcc/2006-06-19/gcc/gcc/config/i386/crtfastmath.c \
> > -o crtfastmath.o
> > /bin/sh /src/gcc/2006-06-19/gcc/gcc/../move-if-change tmp-macro_list
> > macro_list
> > *** glibc detected *** /build/gcc/2006-06-19-nc/./gcc/cc1: malloc(): memory
> > corruption: 0x08591630 ***
> > ======= Backtrace: =========
> > /lib/libc.so.6[0x5ee1a2]
> > /lib/libc.so.6(malloc+0x74)[0x5ef587]
> > /lib/libc.so.6[0x5af193]
> > /lib/libc.so.6[0x5ad498]
> > /lib/libc.so.6[0x5ace25]
> > /lib/libc.so.6(__dcgettext+0x43)[0x5abed7]
> > /lib/libc.so.6(strsignal+0x13c)[0x5f4a13]
> > /build/gcc/2006-06-19-nc/./gcc/cc1[0x830e5b2]
> > ======= Memory map: ========
> > 0055d000-0055e000 r-xp 0055d000 00:00 0 [vdso]
> > 0055e000-00578000 r-xp 00000000 fd:00 5499650 /lib/ld-2.3.6.so
> > 00578000-00579000 r-xp 00019000 fd:00 5499650 /lib/ld-2.3.6.so
> > 00579000-0057a000 rwxp 0001a000 fd:00 5499650 /lib/ld-2.3.6.so
> > 0058a000-006ad000 r-xp 00000000 fd:00 5499657 /lib/libc-2.3.6.so
> > 006ad000-006af000 r-xp 00122000 fd:00 5499657 /lib/libc-2.3.6.so
> > 006af000-006b1000 rwxp 00124000 fd:00 5499657 /lib/libc-2.3.6.so
> > 006b1000-006b3000 rwxp 006b1000 00:00 0
> > 00a29000-00a33000 r-xp 00000000 fd:00 16893261
> > /build/gcc/2006-06-19-nc/prev-gcc/libgcc_s.so.1
> > 00a33000-00a34000 rwxp 00009000 fd:00 16893261
> > /build/gcc/2006-06-19-nc/prev-gcc/libgcc_s.so.1
> > 08048000-084cf000 r-xp 00000000 fd:00 16926839
> > /build/gcc/2006-06-19-nc/gcc/cc1
> > 084cf000-084d4000 rw-p 00486000 fd:00 16926839
> > /build/gcc/2006-06-19-nc/gcc/cc1
> > 084d4000-085a0000 rw-p 084d4000 00:00 0 [heap]
> > b7b00000-b7b21000 rw-p b7b00000 00:00 0
> > b7b21000-b7c00000 ---p b7b21000 00:00 0
> > b7c87000-b7dd8000 rw-p b7c87000 00:00 0
> > b7dd8000-b7fd8000 r--p 00000000 fd:00 201117
> > /usr/lib/locale/locale-archive
> > b7fd8000-b7fd9000 rw-p b7fd8000 00:00 0
> > b7ffe000-b8000000 rw-p b7ffe000 00:00 0
> > bffe8000-bffff000 rw-p bffe8000 00:00 0 [stack]
> > xgcc: Internal error: Segmentation fault (program cc1)
> > Please submit a full bug report.
> > See <URL:http://gcc.gnu.org/bugs.html> for instructions.
> > make[3]: *** [crtfastmath.o] Error 1
> > make[3]: *** Waiting for unfinished jobs....
> > echo timestamp > s-macro_list
> > make[3]: *** Waiting for unfinished jobs....
> > rm fsf-funding.pod gcov.pod gfdl.pod cpp.pod gpl.pod gcc.pod
> > make[3]: Leaving directory `/build/gcc/2006-06-19-nc/gcc'
> > make[2]: *** [all-stage2-gcc] Error 2
> > make[2]: Leaving directory `/build/gcc/2006-06-19-nc'
> > make[1]: *** [stage2-bubble] Error 2
> > make[1]: Leaving directory `/build/gcc/2006-06-19-nc'
> > make: *** [all] Error 2
> >
> >
> >
> > Has anyone else encountered this? I'm checking back to see when/if this
> > suddenly appeared. It also happens with a much earlier version of the
> > kernel. If I recall from my poking around earlier last week, bitmap.o
> > get miscompiled in stage1, but take that with a grain of salt.. a lot of
> > things were going on last week and I don't know if that is still true
> > today.
> >
> > Andrew
> >
