[Bug lto/64374] New: [5.0 regression] LTO ICE in extract_insn, at recog.c:2327

[dimhen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64374

            Bug ID: 64374
           Summary: [5.0 regression] LTO ICE in extract_insn, at
                    recog.c:2327
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dimhen at gmail dot com

r218764 PASS
r218817 FAIL, r218991 FAIL

Fedora 21 / x86_64

gcc -fpreprocessed -O3 -flto -c a.i -fPIC -DPIC -o a.o
g++ -fpreprocessed -O3 -flto -c b.ii -fPIC -DPIC -o b.o
g++ -fpreprocessed -O3 -flto -c e.ii -o e.o
g++ -flto -o x a.o b.o e.o

e.ii: In function ‘main’:
e.ii:10:1: error: unrecognizable insn:
 }
 ^
(insn 52 13 16 3 (set (reg/f:DI 5 di [orig:98 D.3984 ] [98])
        (plus:DI (reg:DI 0 ax [97])
            (symbol_ref:DI ("mOID_Params") [flags 0x2] <var_decl 0x7fe0f905f900
mOID_Params>))) a.i:13 -1
     (nil))
e.ii:10:1: internal compiler error: in extract_insn, at recog.c:2327
0xb230b8 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
    /home/dimhen/src/gcc_current/gcc/rtl-error.c:110
0xb23148 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
    /home/dimhen/src/gcc_current/gcc/rtl-error.c:118
0xad96f8 extract_insn(rtx_insn*)
    /home/dimhen/src/gcc_current/gcc/recog.c:2327
0xad97a7 extract_insn_cached(rtx_insn*)
    /home/dimhen/src/gcc_current/gcc/recog.c:2218
0x86f8c9 cleanup_subreg_operands(rtx_insn*)
    /home/dimhen/src/gcc_current/gcc/final.c:3124
0xad51b9 split_insn
    /home/dimhen/src/gcc_current/gcc/recog.c:2937
0xadd3ad split_all_insns()
    /home/dimhen/src/gcc_current/gcc/recog.c:2991
0xadd4c8 rest_of_handle_split_after_reload
    /home/dimhen/src/gcc_current/gcc/recog.c:3938
0xadd4c8 execute
    /home/dimhen/src/gcc_current/gcc/recog.c:3967
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: fatal error: /usr/local/gcc_current/bin/g++ returned 1 exit status
compilation terminated.
/usr/bin/ld: fatal error: lto-wrapper failed
collect2: error: ld returned 1 exit status

$ /usr/local/gcc_current/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc_current/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc_current/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/dimhen/src/gcc_current/configure
--prefix=/usr/local/gcc_current/ --enable-checking=yes,df,rtl
--enable-languages=c,c++,lto --enable-plugin=yes --enable-static
Thread model: posix
gcc version 5.0.0 20141220 (experimental) [trunk revision 218991] (GCC) 

$ cat a.i
typedef struct {const int m} s;
s ms[];
int i;

int *Create ( )
{
  for ( ; ms[i].m; i++ )
    f1 ( &ms[i] );
}

$ cat b.ii
extern "C" {
  typedef unsigned CPCCreate_t(int *, int);
  CPCCreate_t CPCCreate;
  int *Create();
}

unsigned CPCCreate(int *, int)
{
  Create();
}

$ cat e.ii
extern "C" {
  typedef unsigned CPCCreate_t(int, int);
  CPCCreate_t CPCCreate;
}
main() {
  CPCCreate(0, 0);
  for (;;)
    ;
}