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Re: Debugging lto1, how?
On Tue, Dec 29, 2009 at 6:50 PM, Rafael Espindola <espindola@google.com> wrote:
>> I have the lto1 command line, yes. But that gives a different failure.
>> When run from gcc, lto1 crashes with an ICE, and when I run lto1
>> standalone, it crashes with an error reading a hex number.
>
> Do you have a backtrace of that?
> You can also copy the gcc line and pass -wrapper to it.
Here's what I'm trying to do:
stevenb@iowa:~/devel/build/gcc$ ./xgcc -B. -O2 -flto -c -o t.o t.c
stevenb@iowa:~/devel/build/gcc$ ./xgcc -B. -O2 -flto -r -o t.o t.c -nostdlib
In file included from :0:0:
t.c: In function 'foo':
t.c:7:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: ././xgcc returned 1 exit status
collect2: lto-wrapper returned 1 exit status
stevenb@iowa:~/devel/build/gcc$ ./xgcc -B. -O2 -flto -c -o t.o t.c
stevenb@iowa:~/devel/build/gcc$ ./xgcc -B. -O2 -flto -r -o t.o t.c
-nostdlib -save-temps
t.o: file not recognized: File truncated
collect2: ld returned 1 exit status
stevenb@iowa:~/devel/build/gcc$
stevenb@iowa:~/devel/build/gcc$ ./xgcc -B. -O2 -flto -r -o t.o t.c
-nostdlib -Wl,-debug -v
Reading specs from ./specs
COLLECT_GCC=./xgcc
COLLECT_LTO_WRAPPER=./lto-wrapper
Target: ia64-unknown-linux-gnu
Configured with: ../trunk/configure --with-gmp=/home/stevenb
--with-mpfr=/home/stevenb --with-mpc=/home/stevenb
--enable-languages=c --disable-nls --disable-bootstrap
--disable-libmudflap --disable-checking
Thread model: posix
gcc version 4.5.0 20091229 (experimental) [trunk revision 155504] (GCC)
COLLECT_GCC_OPTIONS='-B.' '-O2' '-flto' '-r' '-o' 't.o' '-nostdlib' '-v'
./cc1 -quiet -v -iprefix
/home/stevenb/devel/build/gcc/../lib/gcc/ia64-unknown-linux-gnu/4.5.0/
-isystem ./include -isystem ./include-fixed t.c -quiet -dumpbase t.c
-auxbase t -O2 -version -flto -o /tmp/ccrkWvWJ.s
GNU C (GCC) version 4.5.0 20091229 (experimental) [trunk revision
155504] (ia64-unknown-linux-gnu)
compiled by GNU C version 4.3.4, GMP version 4.2.4, MPFR version
2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/home/stevenb/devel/build/gcc/../lib/gcc/ia64-unknown-linux-gnu/4.5.0/include"
ignoring nonexistent directory
"/home/stevenb/devel/build/gcc/../lib/gcc/ia64-unknown-linux-gnu/4.5.0/include-fixed"
ignoring nonexistent directory
"/home/stevenb/devel/build/gcc/../lib/gcc/ia64-unknown-linux-gnu/4.5.0/../../../../ia64-unknown-linux-gnu/include"
ignoring nonexistent directory
"/home/stevenb/devel/build/gcc/../lib/gcc/../../lib/gcc/ia64-unknown-linux-gnu/4.5.0/include"
ignoring nonexistent directory
"/home/stevenb/devel/build/gcc/../lib/gcc/../../lib/gcc/ia64-unknown-linux-gnu/4.5.0/include-fixed"
ignoring nonexistent directory
"/home/stevenb/devel/build/gcc/../lib/gcc/../../lib/gcc/ia64-unknown-linux-gnu/4.5.0/../../../../ia64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
./include
./include-fixed
/usr/local/include
/usr/include
End of search list.
GNU C (GCC) version 4.5.0 20091229 (experimental) [trunk revision
155504] (ia64-unknown-linux-gnu)
compiled by GNU C version 4.3.4, GMP version 4.2.4, MPFR version
2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 32e44dfa726727a33cceaeab86c3ae9a
COLLECT_GCC_OPTIONS='-B.' '-O2' '-flto' '-r' '-o' 't.o' '-nostdlib' '-v'
./as -x -o /tmp/ccKl30Yq.o /tmp/ccrkWvWJ.s
COMPILER_PATH=./
LIBRARY_PATH=./:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-B.' '-O2' '-flto' '-r' '-o' 't.o' '-nostdlib' '-v'
./collect2 -flto -dynamic-linker /lib/ld-linux-ia64.so.2 -o t.o -r
-L. /tmp/ccKl30Yq.o -debug
Convert string './' into prefixes, separator = ':'
- add prefix: ./
Convert string '/home/stevenb/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games'
into prefixes, separator = ':'
- add prefix: /home/stevenb/bin/
- add prefix: /usr/local/bin/
- add prefix: /usr/bin/
- add prefix: /bin/
- add prefix: /usr/bin/X11/
- add prefix: /usr/games/
Looking for 'real-ld'
Looking for 'collect-ld'
Looking for 'gnm'
Looking for 'gnm'
Looking for 'nm'
Looking for 'gstrip'
Looking for 'gstrip'
Looking for 'strip'
Looking for 'strip'
Looking for './xgcc'
collect2 version 4.5.0 20091229 (experimental) [trunk revision 155504]
(IA-64) Linux
ld_file_name = ./collect-ld
c_file_name = ././xgcc
nm_file_name = ./nm
strip_file_name = /usr/bin/strip
c_file = /tmp/ccZ1OjzU.c
o_file = /tmp/ccssBfZE.o
COLLECT_GCC_OPTIONS = '-B.' '-O2' '-flto' '-r' '-o' 't.o' '-nostdlib' '-v'
COLLECT_GCC = ./xgcc
COMPILER_PATH = ./
LIBRARY_PATH = ./:/lib/:/usr/lib/
./collect-ld -dynamic-linker /lib/ld-linux-ia64.so.2 -o t.o -r -L.
/tmp/ccKl30Yq.o
./nm -n /tmp/ccKl30Yq.o
nm output with LTO info marker symbol.
0000000000000000 T foo
0000000000000001 C gnu_lto_v1
./lto-wrapper ././xgcc -B. -O2 -flto -r -o t.o -nostdlib -v -debug
/tmp/ccKl30Yq.o
././xgcc @/tmp/ccKuqXmD.args
Reading specs from ./specs
COLLECT_GCC=././xgcc
COLLECT_LTO_WRAPPER=./lto-wrapper
Target: ia64-unknown-linux-gnu
Configured with: ../trunk/configure --with-gmp=/home/stevenb
--with-mpfr=/home/stevenb --with-mpc=/home/stevenb
--enable-languages=c --disable-nls --disable-bootstrap
--disable-libmudflap --disable-checking
Thread model: posix
gcc version 4.5.0 20091229 (experimental) [trunk revision 155504] (GCC)
COLLECT_GCC_OPTIONS='-combine' '-c' '-o' '/tmp/ccSrQtLT.lto.o' '-B.'
'-O2' '-r' '-nostdlib' '-v'
./lto1 -quiet -dumpbase ccKl30Yq.o -auxbase-strip /tmp/ccSrQtLT.lto.o
-O2 -version @/tmp/cc9NtICT -o /tmp/ccguEU3C.s
GNU GIMPLE (GCC) version 4.5.0 20091229 (experimental) [trunk revision
155504] (ia64-unknown-linux-gnu)
compiled by GNU C version 4.3.4, GMP version 4.2.4, MPFR version
2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU GIMPLE (GCC) version 4.5.0 20091229 (experimental) [trunk revision
155504] (ia64-unknown-linux-gnu)
compiled by GNU C version 4.3.4, GMP version 4.2.4, MPFR version
2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
In file included from :0:0:
t.c: In function 'foo':
t.c:7:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: ././xgcc returned 1 exit status
[Leaving LTRANS /tmp/ccSrQtLT.lto.o]
[Leaving LTRANS /tmp/ccKuqXmD.args]
collect2: lto-wrapper returned 1 exit status
[Leaving /tmp/ccZ1OjzU.c]
[Leaving /tmp/ccssBfZE.o]
[Leaving /tmp/ccZ0Yspp.ld]
[Leaving /tmp/ccYvlGN9.le]
[Leaving t.o]
stevenb@iowa:~/devel/build/gcc$
(BTW, why is the "GNU GIMPLE ..." written twice by lto1?)
At this point, I would like to do "././xgcc @/tmp/ccITy4iP.args" with
-wrapper. But since compiling with -save-temps didn't work, the .args
file references the wrong files (or something -- anyway it doesn't
work):
stevenb@iowa:~/devel/build/gcc$ ././xgcc @/tmp/ccITy4iP.args
xgcc: /tmp/cck6JT4A.o: No such file or directory
xgcc: warning: '-x lto' after last input file has no effect
xgcc: no input files
Then I tried (somewhat naive, I suppose) to run lto1 like so:
stevenb@iowa:~/devel/build/gcc$ ./lto1 -quiet -dumpbase ccKl30Yq.o
-auxbase-strip /tmp/ccSrQtLT.lto.o -O2 -version @/tmp/cc9NtICT -o
/tmp/ccguEU3C.s
GNU GIMPLE (GCC) version 4.5.0 20091229 (experimental) [trunk revision
155504] (ia64-unknown-linux-gnu)
compiled by GNU C version 4.3.4, GMP version 4.2.4, MPFR version
2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
lto1: internal compiler error: could not parse hex number
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
stevenb@iowa:~/devel/build/gcc$
Thinking about it now, this of course also fails because the
referenced files in /tmp do not exist. Anyway, that should still not
ICE. Backtrace for that looks like this:
Starting program: /home/stevenb/devel/build/gcc/lto1 -quiet -dumpbase
ccKl30Yq.o -auxbase-strip /tmp/ccSrQtLT.lto.o -O2 -version
@/tmp/cc9NtICT -o /tmp/ccguEU3C.s
GNU GIMPLE (GCC) version 4.5.0 20091229 (experimental) [trunk revision
155504] (ia64-unknown-linux-gnu)
compiled by GNU C version 4.3.4, GMP version 4.2.4, MPFR version
2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Breakpoint 2, internal_error (gmsgid=0x400000000164a460 "could not
parse hex number") at ../../trunk/gcc/diagnostic.c:672
672 va_start (ap, gmsgid);
(gdb) bt 10
#0 internal_error (gmsgid=0x400000000164a460 "could not parse hex
number") at ../../trunk/gcc/diagnostic.c:672
#1 0x40000000000e5b70 in lto_parse_hex (p=0x60000fffffe43957
"mp/cc9NtICT") at ../../trunk/gcc/lto/lto.c:268
#2 0x40000000000f6230 in lto_elf_file_open
(filename=0x60000fffffe43954 "@/tmp/cc9NtICT", writable=0 '\0')
at ../../trunk/gcc/lto/lto-elf.c:563
#3 0x40000000000f1c80 in lto_read_all_file_options () at
../../trunk/gcc/lto/lto.c:1748
#4 0x40000000000c3210 in lto_post_options
(pfilename=0x60000000000995f8) at ../../trunk/gcc/lto/lto-lang.c:669
#5 0x4000000000ab76b0 in process_options () at ../../trunk/gcc/toplev.c:1788
#6 0x4000000000aba220 in do_compile () at ../../trunk/gcc/toplev.c:2371
#7 0x4000000000aba5f0 in toplev_main (argc=11,
argv=0x60000fffffe43698) at ../../trunk/gcc/toplev.c:2429
#8 0x40000000000f97e0 in main (argc=11, argv=0x60000fffffe43698) at
../../trunk/gcc/main.c:35
(gdb)
Hope this helps...
Ciao!
Steven