I tried something slightly different: I asked an x86 Debian machine
at work to cross-compile the gcc package for powerpc. It didn't have
any crosstools installed, so the compilation failed, but it did apply
the patches to the source tree so that I could copy it over to my PPC
machine.
I then ran configure with the same operations as the Debian build
(except different prefix and disabling all languages except C and C++)
and then make, but yet again GCC fails at building itself. Crash
during stage2 again:
/biggus/gcc-6-debian/build/./prev-gcc/xg++
-B/biggus/gcc-6-debian/build/./prev-gcc/ -B/opt/gcc6/powerpc-linux-gnu/bin/
-nostdinc++ -B/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libatomic/.libs
-B/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libstdc++-v3/src/.libs
-B/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libstdc++-v3/libsupc++/.libs
-I/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libstdc++-v3/include/powerpc-linux-gnu
-I/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libstdc++-v3/include
-I/biggus/gcc-6-debian/src/libstdc++-v3/libsupc++
-L/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libatomic/.libs
-L/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libstdc++-v3/src/.libs
-L/biggus/gcc-6-debian/build/prev-powerpc-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c -DIN_GCC_FRONTEND -g -O2 -gtoggle -DIN_GCC -fno-exceptions
-fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -DHAVE_CONFIG_H -I. -Icp
-I/biggus/gcc-6-debian/build/../src/gcc
-I/biggus/gcc-6-debian/build/../src/gcc/cp
-I/biggus/gcc-6-debian/build/../src/gcc/../include
-I/biggus/gcc-6-debian/build/../src/gcc/../libcpp/include
-I/biggus/gcc-6-debian/build/../src/gcc/../libdecnumber
-I/biggus/gcc-6-debian/build/../src/gcc/../libdecnumber/dpd -I../libdecnumber
-I/biggus/gcc-6-debian/build/../src/gcc/../libbacktrace -o
cp/cp-objcp-common.o -MT cp/cp-objcp-common.o -MMD -MP -MF
cp/.deps/cp-objcp-common.TPo
/biggus/gcc-6-debian/build/../src/gcc/cp/cp-objcp-common.c
/biggus/gcc-6-debian/build/../src/gcc/cp/cp-objcp-common.c: In function ¡void
init_shadowed_var_for_decl()¢:
/biggus/gcc-6-debian/build/../src/gcc/cp/cp-objcp-common.c:202:1: internal
compiler error: Segmentation fault
init_shadowed_var_for_decl (void)
^~~~~~~~~~~~~~~~~~~~~~~~~~
0x10c39317 crash_signal
/biggus/gcc-6-debian/build/../src/gcc/toplev.c:333
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-6/README.Bugs> for instructions.
Makefile:1088: recipe for target 'cp/cp-objcp-common.o' failed
make[3]: *** [cp/cp-objcp-common.o] Error 1
make[3]: *** Waiting for unfinished jobs....
