------- Comment #1 from lucier at math dot purdue dot edu 2006-05-31 04:42
-------
Subject: Re: New: ICE building darwin-crt2.c in 64-bit darwin bootstrap
I ran cc1 a bit through gdb; perhaps real.c has been miscompiled.
[lindv2:mainline/objdir64/gcc] lucier% gdb /Users/lucier/programs/gcc/
mainline/objdir64/./gcc/cc1
GNU gdb 6.3.50-20050815 (Apple version gdb-477) (Sun Apr 30 20:06:22
GMT 2006)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
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details.
This GDB was configured as "powerpc-apple-darwin"...Reading symbols
for shared libraries .. done
Breakpoint 1 at 0x44e55c: file ../../gcc/diagnostic.c, line 642.
Breakpoint 2 at 0x44e3e0: file ../../gcc/diagnostic.c, line 586.
Breakpoint 3 at 0x906f4
Breakpoint 4 at 0xf4e38
(gdb) run -quiet -v -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/../
include -I./../intl -I../../gcc/../libcpp/include -I../../gcc/../
libdecnumber -I../libdecnumber -iprefix /Users/lucier/programs/gcc/
mainline/objdir64/gcc/../lib/gcc/powerpc-apple-darwin8.6.0/4.2.0/ -
isystem /Users/lucier/programs/gcc/mainline/objdir64/./gcc/include -
D__DYNAMIC__ -DIN_GCC -isystem /pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/include -isystem /pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/sys-include -isystem ./include ../../gcc/config/darwin-
crt2.c -feliminate-unused-debug-symbols -fPIC -quiet -dumpbase darwin-
crt2.c -auxbase-strip crt2.o -g -O2 -O2 -W -Wall -Wwrite-strings -
Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -
version -o /var/tmp//ccti7FKQ.s
Starting program: /Users/lucier/programs/gcc/mainline/objdir64/gcc/
cc1 -quiet -v -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/../
include -I./../intl -I../../gcc/../libcpp/include -I../../gcc/../
libdecnumber -I../libdecnumber -iprefix /Users/lucier/programs/gcc/
mainline/objdir64/gcc/../lib/gcc/powerpc-apple-darwin8.6.0/4.2.0/ -
isystem /Users/lucier/programs/gcc/mainline/objdir64/./gcc/include -
D__DYNAMIC__ -DIN_GCC -isystem /pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/include -isystem /pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/sys-include -isystem ./include ../../gcc/config/darwin-
crt2.c -feliminate-unused-debug-symbols -fPIC -quiet -dumpbase darwin-
crt2.c -auxbase-strip crt2.o -g -O2 -O2 -W -Wall -Wwrite-strings -
Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -
version -o /var/tmp//ccti7FKQ.s
Reading symbols for shared libraries .+ done
Breakpoint 3 at 0x42695718
Breakpoint 4 at 0x426f9e58
ignoring nonexistent directory "/pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/include"
ignoring nonexistent directory "/pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/sys-include"
ignoring duplicate directory "./include"
ignoring nonexistent directory "/Users/lucier/programs/gcc/mainline/
objdir64/gcc/../lib/gcc/powerpc-apple-darwin8.6.0/4.2.0/include"
ignoring nonexistent directory "/Users/lucier/programs/gcc/mainline/
objdir64/gcc/../lib/gcc/powerpc-apple-darwin8.6.0/4.2.0/../../../../
powerpc-apple-darwin8.6.0/include"
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/pkgs/gcc-4.2.0/include"
ignoring nonexistent directory "/pkgs/gcc-4.2.0/lib/gcc/powerpc-apple-
darwin8.6.0/4.2.0/include"
ignoring nonexistent directory "/pkgs/gcc-4.2.0/powerpc-apple-
darwin8.6.0/include"
ignoring duplicate directory "."
ignoring duplicate directory "../../gcc/."
#include "..." search starts here:
#include <...> search starts here:
.
../../gcc
../../gcc/../include
./../intl
../../gcc/../libcpp/include
../../gcc/../libdecnumber
../libdecnumber
/Users/lucier/programs/gcc/mainline/objdir64/./gcc/include
/usr/include
/System/Library/Frameworks
/Library/Frameworks
End of search list.
GNU C version 4.2.0 20060530 (experimental) (powerpc-apple-darwin8.6.0)
compiled by GNU C version 4.0.1 (Apple Computer, Inc. build
5341).
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x00000000423ac000
0x00000000007b7378 in sticky_rshift_significand (r=0x40c48118,
a=0x40c48118, n=4294967295) at ../../gcc/real.c:179
179 sticky |= a->sig[i];
(gdb) stack
Undefined command: "stack". Try "help".
(gdb) where
#0 0x00000000007b7378 in sticky_rshift_significand (r=0x40c48118,
a=0x40c48118, n=4294967295) at ../../gcc/real.c:179
#1 0x00000000007bddf0 in round_for_format (fmt=0x40c49c38,
r=0x40c48118) at ../../gcc/real.c:2372
#2 0x00000000007be4e8 in real_convert (r=0x40c48118, mode=DFmode,
a=0x40c48118) at ../../gcc/real.c:2472
#3 0x00000000007bcec8 in real_from_integer (r=0x40c48118,
mode=DFmode, low=1, high=0, unsigned_p=0) at ../../gcc/real.c:2066
#4 0x00000000004a1ac0 in init_emit_once (line_numbers=1) at ../../
gcc/emit-rtl.c:5194
#5 0x00000000008a8444 in backend_init () at ../../gcc/toplev.c:1825
#6 0x00000000008a8898 in do_compile () at ../../gcc/toplev.c:1966
#7 0x00000000008a8974 in toplev_main (argc=44, argv=0x7fffeffffef68)
at ../../gcc/toplev.c:2002
#8 0x00000000000f3508 in main (argc=44, argv=0x7fffeffffef68)
at ../../gcc/main.c:35
(gdb) list
174 unsigned int i, ofs = 0;
175
176 if (n >= HOST_BITS_PER_LONG)
177 {
178 for (i = 0, ofs = n / HOST_BITS_PER_LONG; i < ofs; ++i)
179 sticky |= a->sig[i];
180 n &= HOST_BITS_PER_LONG - 1;
181 }
182
183 if (n != 0)
(gdb) p a
$1 = (const struct real_value *) 0x40c48118
(gdb) p *a
$2 = {
cl = 1,
decimal = 0,
sign = 0,
signalling = 0,
canonical = 0,
uexp = 1,
sig = {0, 0, 9223372036854775808}
}
(gdb) p i
$3 = 3065820
(gdb) info args
r = (struct real_value *) 0x40c48118
a = (const struct real_value *) 0x40c48118
n = 4294967295
(gdb) info locals
sticky = 18446744073709551615
i = 3065820
ofs = 67108863
(gdb) p *r
$4 = {
cl = 1,
decimal = 0,
sign = 0,
signalling = 0,
canonical = 0,
uexp = 1,
sig = {0, 0, 9223372036854775808}
}
(gdb) p *a
$5 = {
cl = 1,
decimal = 0,
sign = 0,
signalling = 0,
canonical = 0,
uexp = 1,
sig = {0, 0, 9223372036854775808}
}
(gdb) up
#1 0x00000000007bddf0 in round_for_format (fmt=0x40c49c38,
r=0x40c48118) at ../../gcc/real.c:2372
2372 r->sig[0] |= sticky_rshift_significand (r, r, shift);
(gdb) info locals
shift = -1
p2 = 0
np2 = 192
i = 32
w = 128
sticky = 1117819808
guard = 255 'ÿ'
lsb = 255 'ÿ'
emin2m1 = 0
emax2 = 0
__FUNCTION__ = "round_for_format"
(gdb) info args
fmt = (const struct real_format *) 0x40c49c38
r = (struct real_value *) 0x40c48118
(gdb) p *fmt
$6 = {
encode = 0,
decode = 0,
b = 0,
log2_b = 0,
p = 0,
pnan = 0,
emin = 0,
emax = 0,
signbit_ro = 0,
signbit_rw = 0,
has_nans = 0 '\0',
has_inf = 0 '\0',
has_denorm = 0 '\0',
has_signed_zero = 0 '\0',
qnan_msb_set = 0 '\0'
}
(gdb) p *r
$7 = {
cl = 1,
decimal = 0,
sign = 0,
signalling = 0,
canonical = 0,
uexp = 1,
sig = {0, 0, 9223372036854775808}
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27814
