ICE with CVS egcs-2.92.13 on m68k-motorola-sysv
Manfred Hollstein
manfred@s-direktnet.de
Wed Oct 7 08:48:00 GMT 1998
This happened during "make bootstrap" on m68k-motorola-sysv (aka "delta")
while compiling libgcc2.c with the just built stage1 compiler:
./xgcc -B./ -O2 -DIN_GCC -g -I./include -DUSE_GAS -g1 -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -I. -I../../egcs-19981006/gcc -I../../egcs-19981006/gcc/config -I../../egcs-19981006/gcc/../include -c -DL${name} \
../../egcs-19981006/gcc/libgcc2.c -o ${name}.o; \
if [ $? -eq 0 ] ; then true; else exit 1; fi; \
ar rc tmplibgcc2.a ${name}.o; \
rm -f ${name}.o; \
done
_muldi3
xgcc: Internal compiler error: program cc1 got fatal signal 11
I've attached a stack backtrace from inside gdb and the preprocessed
libgcc2.i.gz. The backtrace shows, that "free" is called from
"reload" with a NULL pointer; somehow, reload1.c is looking rather
strange here:
/* Indicate that we no longer have known memory locations or constants. */
reg_equiv_constant = 0;
reg_equiv_memory_loc = 0;
if (real_known_ptr)
free (real_known_ptr);
if (real_at_ptr)
free (real_at_ptr);
-> free (reg_equiv_constant);
free (reg_equiv_memory_loc);
Please note, some lines above "reg_equiv_constant" has been set to 0,
so why is "free" called here? One fix would be to simply drop the two
offending calls to "free", but I'm not sure if that's correct.
The problem with the m88k machine description (see
< http://www.cygnus.com/ml/egcs-bugs/1998-Sep/0683.html >) still persists;
Jeff Law identified it to be a bug in m88k.md, but this hasn't changed
since at least egcs-1.1b; and there it could be built.
Sources: - egcs from CVS last updated at 1998/10/06 11:37:00 +0200
- libg++-2.8.1.2 + some small patches, which will
become -2.8.1.2a soon.
Patches: [1]: `2nd PATCH to pre-select languages to be build'
from <manfred@s-direktnet.de>.
[2]: `PATCH to make g++ find its include files again'
from <manfred@s-direktnet.de>.
Environment: - GNU binutils 2.9.1 + Ian Lance Taylor's patch to gas/ehopt.c
- dejagnu-971028
- gperf-2.7
configure flags: --with-gcc-version-trigger=/phys/b60/data62/manfred-work/GNU/egcs-19981006/gcc/version.c --host=delta --srcdir=../egcs-19981006 --prefix=/u/b60/manfred/gnu/delta --with-gnu-as --with-gnu-ld --enable-version-specific-runtime-libs --with-local-prefix=/u/b60/manfred/gnu/delta --enable-languages=c,proto,gcov,c++ --disable-nls --verbose --norecursion
BOOT_CC: gcc version egcs-2.91.57 19980901 (egcs-1.1 release)
BOOT_CFLAGS: -O2 -g
CFLAGS: -O2 -g
CXXFLAGS: -O2 -g
manfred
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GDB 4.16 (delta), Copyright 1996 Free Software Foundation, Inc...
Breakpoint 1 at 0x1a3fb8
Breakpoint 2 at 0x1a1da8
Breakpoint 3 at 0x37338: file toplev.c, line 2129.
(gdb) r libgcc2.i -quiet -dumpbase libgcc2.c -g -g1 -O2 -version -o libgcc2.s
Starting program: /home/manfred/work/GNU/egcs-19981006-/gcc/cc1 libgcc2.i -quiet -dumpbase libgcc2.c -g -g1 -O2 -version -o libgcc2.s
GNU C version egcs-2.92.13 19981006 (gcc2 ss-980609 experimental) (delta) compiled by GNU C version egcs-2.91.57 19980901 (egcs-1.1 release).
Program received signal SIGSEGV, Segmentation fault.
0x1a2e00 in free ()
(gdb) bt
#0 0x1a2e00 in free ()
#1 0x13c2fc in reload (first=0x5c0818, global=1, dumpfile=0x0)
at reload1.c:1271
#2 0x127488 in global_alloc (file=0x0) at global.c:582
#3 0x39a62 in rest_of_compilation (decl=0x5def24) at toplev.c:3749
#4 0x1d254 in finish_function (nested=0) at c-decl.c:7181
#5 0x89aa in yyparse () at c-parse.c:313
#6 0x38396 in compile_file (name=0x3ffff75e "libgcc2.i") at toplev.c:2788
#7 0x3bde6 in main (argc=11, argv=0x3ffff614) at toplev.c:4862
(gdb) up
#1 0x13c2fc in reload (first=0x5c0818, global=1, dumpfile=0x0)
at reload1.c:1271
1271 free (reg_equiv_constant);
(gdb) p reg_equiv_constant
$1 = (struct rtx_def **) 0x0
(gdb)
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