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Re: [5/8] Tweak bitfield alignment handling
John David Anglin writes:
> On Sun, 18 Nov 2012, Richard Sandiford wrote:
>
> > HOST_WIDE_INT start = bitpos_ - (bitpos_ % unit);
> > if (bitregion_start_ && start < bitregion_start_)
> > break;
> > - if (bitregion_end_ && start + unit > bitregion_end_ + 1)
> > + if (start + unit > bitregion_end_ + 1)
>
> This causes:
>
> /home/dave/gnu/gcc/objdir/./prev-gcc/g++ -B/home/dave/gnu/gcc/objdir/./prev-gcc/ -B/home/dave/opt/gnu/gcc/gcc-4.8.0/hppa-linux-gnu/bin/ -nostdinc++ -B/home/dave/gnu/gcc/objdir/prev-hppa-linux-gnu/libstdc++-v3/src/.libs -B/home/dave/gnu/gcc/objdir/prev-hppa-linux-gnu/libstdc++-v3/libsupc++/.libs -I/home/dave/gnu/gcc/objdir/prev-hppa-linux-gnu/libstdc++-v3/include/hppa-linux-gnu -I/home/dave/gnu/gcc
> /objdir/prev-hppa-linux-gnu/libstdc++-v3/include -I/home/dave/gnu/gcc/gcc/libstdc++-v3/libsupc++ -L/home/dave/gnu/gcc/objdir/prev-hppa-linux-gnu/libstdc++-v3/sr
> c/.libs -L/home/dave/gnu/gcc/objdir/prev-hppa-linux-gnu/libstdc++-v3/libsupc++/.libs -c -g -O2 -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tabl
> es -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribut
> e -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
> -fno-common -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../g
> cc/gcc/../include -I../../gcc/gcc/../libcpp/include -I../../gcc/gcc/../libdecnu
> mber -I../../gcc/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc/gcc/../li
> bbacktrace ../../gcc/gcc/stor-layout.c -o stor-layout.o../../gcc/gcc/stor-layout.c: In member function ã??bool bit_field_mode_iterator::n
> ext_mode(machine_mode*)ã??:
> ../../gcc/gcc/stor-layout.c:2690:43: error: comparison between signed and unsign
> ed integer expressions [-Werror=sign-compare]
> if (start + unit > bitregion_end_ + 1)
> ^
> cc1plus: all warnings being treated as errors
This error also breaks m68k-linux bootstrap.
HWI32 issue?