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Re: gcc-4.6.2 fails to build on fedora 17


On 01/23/2012 06:02 PM, Markus Trippelsdorf wrote:
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.

This applies in my case. rawhide's native gcc is a gcc-4.7 variant.

Ralf


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