[Bug c/42126] New: gcc optimizes line away/optimizes to an endless loop

[codemasterhs at yahoo dot de]

The problem with the endless loop is in the function "smpAllocMsg". There gcc
makes out of the while loop ("freeList == 0") an endless loop.

The problem with the line which is optimized away is in the
smpSendMsgBroadcast, its the line "serviceMsg= msg". This problem can be
avoided if I call another function (I tested printf) before the while loop
(msg->refCount > 0).

These 2 problems only occur if I use the "-O2" switch with "-O1" it works.

What I do not understand is, why is gcc doing that, although I´m using the
volatile keyword!?


-- 
           Summary: gcc optimizes line away/optimizes to an endless loop
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: codemasterhs at yahoo dot de
  GCC host triplet: cygwin
GCC target triplet: i586-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42126