[Bug c++/59804] C++ front-end checking ends in an infinite loop on erroneous code

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59804

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |error-recovery,
                   |                            |ice-checking
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-09-27
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.0, 5.0

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
It is recursing here:
1396    #ifdef ENABLE_CHECKING
1397          if (USE_CANONICAL_TYPES)
1398            {
1399              bool result = structural_comptypes (t1, t2, strict);

so we get:

#0  comptypes (t1=0x7ffff6db4000, t2=0x7ffff6d59000, strict=<optimized out>) at
/home/manuel/test1/pristine/gcc/cp/typeck.c:1401
#1  0x00000000006f5e1e in structural_comptypes (t1=0x7ffff6db42a0,
t2=0x7ffff6d592a0, strict=0) at
/home/manuel/test1/pristine/gcc/cp/typeck.c:1341
#2  0x00000000006f7c88 in comptypes (t1=0x7ffff6db42a0, t2=0x7ffff6d592a0,
strict=<optimized out>) at /home/manuel/test1/pristine/gcc/cp/typeck.c:1399
#3  0x00000000006f5e1e in structural_comptypes (t1=0x7ffff6db4540,
t2=0x7ffff6d59540, strict=0) at
/home/manuel/test1/pristine/gcc/cp/typeck.c:1341
#4  0x00000000006f7c88 in comptypes (t1=0x7ffff6db4540, t2=0x7ffff6d59540,
strict=<optimized out>) at /home/manuel/test1/pristine/gcc/cp/typeck.c:1399
#5  0x00000000006f5e1e in structural_comptypes (t1=0x7ffff6db47e0,
t2=0x7ffff6d597e0, strict=0) at
/home/manuel/test1/pristine/gcc/cp/typeck.c:1341
#6  0x00000000006f7c88 in comptypes (t1=0x7ffff6db47e0, t2=0x7ffff6d597e0,
strict=<optimized out>) at /home/manuel/test1/pristine/gcc/cp/typeck.c:1399
#7  0x00000000006f5e1e in structural_comptypes (t1=0x7ffff6db4a80,
t2=0x7ffff6d59a80, strict=0) at
/home/manuel/test1/pristine/gcc/cp/typeck.c:1341
#8  0x00000000006f7c88 in comptypes (t1=0x7ffff6db4a80, t2=0x7ffff6d59a80,
strict=<optimized out>) at /home/manuel/test1/pristine/gcc/cp/typeck.c:1399
#9  0x00000000006f5e1e in structural_comptypes (t1=0x7ffff6db4d20,
t2=0x7ffff6d59d20, strict=0) at
/home/manuel/test1/pristine/gcc/cp/typeck.c:1341