Re: gcc-4.6.2 fails to build on fedora 17

[Markus Trippelsdorf]

On 2012.01.23 at 16:45 +0100, Ralf Corsepius wrote:
> Hi,
> 
> Crossbuilding gcc-4.6.2 for rtems targets succeeds on Fedora 15, 16, 
> openSUSE-11.4 and 12.1, but fails with this error on Fedora rawhide 
> (aka. Fedora 17):
> 
> ...
> # gcc -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions 
> -fstack-protector --param=ssp-buffer-size=4  -m64 -mtune=generic -c   -g 
> -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wwrite-strings 
> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes 
> -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros 
> -Wno-overlength-strings -Wold-style-definition -Wc++-compat 
> -DHAVE_CONFIG_H -I. -I. -I../../gcc-4.6.2/gcc -I../../gcc-4.6.2/gcc/. 
> -I../../gcc-4.6.2/gcc/../include -I../../gcc-4.6.2/gcc/../libcpp/include 
>   -I../../gcc-4.6.2/gcc/../libdecnumber 
> -I../../gcc-4.6.2/gcc/../libdecnumber/dpd -I../libdecnumber 
> gtype-desc.c -o gtype-desc.o
> gtype-desc.c:8735:18: error: subscripted value is neither array nor 
> pointer nor vector
> gtype-desc.c:8854:36: error: subscripted value is neither array nor 
> pointer nor vector
> gtype-desc.c:8938:31: error: subscripted value is neither array nor 
> pointer nor vector
> gtype-desc.c:8959:31: error: subscripted value is neither array nor 
> pointer nor vector
> gtype-desc.c:8966:31: error: subscripted value is neither array nor 
> pointer nor vector
> gtype-desc.c:8973:31: error: subscripted value is neither array nor 
> pointer nor vector
> make[2]: *** [gtype-desc.o] Error 1
> 
> 
> 
> Poking around inside of the build-trees, I found this difference in the 
> GCC-generated sources between Fedora 16 and rawhide, which I am inclined 
> to believe to be related to this breakdown:
> 
> diff -u 
> /var/lib/mock/fedora-16-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4.6.2/build/gcc/gt-cp-mangle.h
>  
> /var/lib/mock/fedora-17-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc
> --- 
> /var/lib/mock/fedora-16-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4.6.2/build/gcc/gt-cp-mangle.h
>  
>         2012-01-23 08:26:19.056369396 +0100
> +++ 
> /var/lib/mock/fedora-17-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4.6.2/build/gcc/gt-cp-mangle.h
>  
>         2012-01-23 08:26:38.648665206 +0100
> @@ -39,7 +39,7 @@
>     {
>       &G.substitutions,
>       1,
> -    sizeof (G.substitutions),
> +    sizeof (G),
>       &gt_ggc_mx_VEC_tree_gc,
>       &gt_pch_nx_VEC_tree_gc
>     },
> diff -u 
> /var/lib/mock/fedora-16-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4.6.2/build/gcc/gtype-desc.c
>  
> /var/lib/mock/fedora-17-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4
> --- 
> /var/lib/mock/fedora-16-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4.6.2/build/gcc/gtype-desc.c
>  
>   2012-01-23 08:26:19.058369427 +0100
> +++ 
> /var/lib/mock/fedora-17-x86_64-rtems/root/builddir/build/BUILD/rtems-4.11-sparc-rtems4.11-gcc-4.6.2/build/gcc/gtype-desc.c
>  
>   2012-01-23 08:26:38.652665266 +0100
> @@ -8375,7 +8375,7 @@
>     {
>       &ipa_escaped_pt.vars,
>       1,
> -    sizeof (ipa_escaped_pt.vars),
> +    sizeof (ipa_escaped_pt),
>       &gt_ggc_mx_bitmap_head_def,
>       &gt_pch_nx_bitmap_head_def
>     },
> ...
> 
> 
> Any ideas about the cause?

I've opened a bug for this issue:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51969

It only happens if you try to build gcc-4.6 with gcc-4.7 on my machine.

-- 
Markus