[Bug middle-end/69915] New: [6 Regression] ICE: SIGSEGV with -O -ftracer with broken backtrace

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69915

            Bug ID: 69915
           Summary: [6 Regression] ICE: SIGSEGV with -O -ftracer with
                    broken backtrace
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu, aarch64-unknown-linux-gnu

Created attachment 37765
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37765&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O -ftracer testcase.c testcase.c: In function 'foo':
testcase.c:4:1: note: The ABI for passing parameters with 32-byte alignment has
changed in GCC 4.6
 foo (unsigned x, unsigned c, V v)
 ^~~
testcase.c:4:1: internal compiler error: Segmentation fault
0xbbbe9f crash_signal
        /repo/gcc-trunk/gcc/toplev.c:335
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.

(gdb) bt 
#0  0x00007ffff6c50e88 in ?? ()
#1  0x00007ffff6c50e88 in ?? ()
#2  0x00007ffff6c50e88 in ?? ()
#3  0x00007ffff6c50e88 in ?? ()
#4  0x00007ffff6c50e88 in ?? ()
#5  0x0000006e00000000 in ?? ()
#6  0x00000000023c4290 in ?? ()
#7  0x0000000000000040 in ?? ()
#8  0x00007ffff6d54498 in ?? ()
#9  0x0000000000000002 in ?? ()
#10 0x00007ffff6d7b5a0 in ?? ()
#11 0x00007ffff6d7b5a0 in ?? ()
#12 0x00007fffffffd030 in ?? ()
#13 0x0000000000000000 in ?? ()

$ x86_64-pc-linux-gnu-gcc -v                                        
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-233597-checking-yes-rtl-df-nographite/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-233597-checking-yes-rtl-df-nographite
Thread model: posix
gcc version 6.0.0 20160222 (experimental) (GCC) 


Out of tested targets (powerpc{,64}, sparc{,64}, i686, arm), only
x86_64-pc-linux-gnu* and aarch64-unknown-linux-gnu seem to be affected.

Tested revisions:
trunk r233597 - ICE
trunk r230518 - ICE
5-branch r233596 - OK