It's getting worse.

Okay, so I used touch to fix up the two problems I reported before.
Now, (a) it modifies the source tree (gnu/dist/toolchain/gcc/cp/parse.h
has as its last line "#define YYEMPTY		-2", and after this
failed build, it's got five more identical #define lines appended to
it) and (b) cc1 falls over while rebuilding libc:

dependall ===> libc
...
/altroot/obj/tools/tools.NetBSD-1.6D-sparc64/bin/sparc64--netbsd-gcc -O -ffixed-g4 -DALL_STATE -DUSG_COMPAT  -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wno-uninitialized -Wreturn-type -Wswitch -Wshadow  -Werror  -D_LIBC -DLIBC_SCCS -DSYSLIBC_SCCS -D_REENTRANT -I/usr/src/lib/libc/include -DHESIOD -DINET6 -DNLS -DYP -DSOFTFLOATSPARC64_FOR_GCC -I/usr/src/lib/libc/arch/sparc64/softfloat -I/usr/src/lib/libc/softfloat  -I/usr/src/lib/libc/softfloat/bits64 -D__DBINTERFACE_PRIVATE -I/usr/src/lib/libc/../../libexec/ld.elf_so -I/usr/src/lib/libc/dlfcn -DI18NMODULE_MAJOR=4 -DWITH_RUNE -I/usr/src/lib/libc -DRESOLVSORT -I. -DPOSIX_MISTAKE -DPORTMAP -DFLOATING_POINT -nostdinc -isystem /altroot/build/usr/include  -c /usr/src/lib/libc/locale/___runetype_mb.c
sparc64--netbsd-gcc: Internal compiler error: program cc1 got fatal signal 11
*** Error code 1

Stop.
nbmake: stopped in /usr/src/lib/libc

It's done this "fatal signal 11" thing thrice now.  I fumble-fingered a
change and lost the first logfile, so I can't be certain about that
one.  But the other two failed at exactly the same place, so I feel
sure there's something problematic going on.

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