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Date: Sat, 22 May 2010 21:38:00 -0000
Subject: [Bug lto/44246]  New: ICE with -fwhopr/-flto when using strlen and strcat without previous declaration
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testcase.c:
-----------------------------
int main(int argc, char *argv[])
{
  strcat(argv[0], "X");
  return strlen(argv[0]);
}
----------------------------

Command line:
$ gcc -flto testcase.c
or
$ gcc -fwhopr testcase.c

Compiler output (-flto):
$ /mnt/svn/gcc-trunk/binary-159696-lto-fortran/bin/gcc -flto testcase.c
testcase.c: In function 'main':
testcase.c:3:3: warning: incompatible implicit declaration of built-in function
'strcat' [enabled by default]
testcase.c:4:10: warning: incompatible implicit declaration of built-in
function 'strlen' [enabled by default]
lto1: error: inlined_to pointer set for noninline callers
lto1: error: inlined_to pointer set for noninline callers
lto1: error: non-DECL_ONE_ONLY node in a same_comdat_group list
lto1: error: same_comdat_group is not a circular list
__builtin_strlen/1(-1) @0x7f2ce1a75690 (asm: strlen) (inline copy in main/0)
availability:not_available
  called by: main/0 (1.00 per call) main/0 (1.00 per call)
  calls:
  References:
  Refering this function:
lto1: internal compiler error: verify_cgraph_node failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /mnt/svn/gcc-trunk/binary-159696-lto-fortran/bin/gcc returned 1
exit status
collect2: lto-wrapper returned 1 exit status

Compiler output (-fwhopr):
$ /mnt/svn/gcc-trunk/binary-159696-lto-fortran/bin/gcc -fwhopr testcase.c
testcase.c: In function 'main':
testcase.c:3:3: warning: incompatible implicit declaration of built-in function
'strcat' [enabled by default]
testcase.c:4:10: warning: incompatible implicit declaration of built-in
function 'strlen' [enabled by default]
lto1: internal compiler error: in function_and_variable_visibility, at
ipa.c:642
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /mnt/svn/gcc-trunk/binary-159696-lto-fortran/bin/gcc returned 1
exit status
collect2: lto-wrapper returned 1 exit status

Tested revisions:
r159696 - crash
r158969 - crash
r158095 - OK -fwhopr, crash -flto
4.5 r158978 - OK -fwhopr, crash -flto (with checking)


-- 
           Summary: ICE with -fwhopr/-flto when using strlen and strcat
                    without previous declaration
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44246