[Bug c++/15209] New: Runs out of memory with packed structs

[bangerth at dealii dot org]

Taken from  http://gcc.gnu.org/ml/gcc-bugs/2004-04/msg02848.html :  
  
This is somewhat ironic: we run out of memory when using packed structs 
the wrong way ;-) 
 
I took the files from the package in above mail and tried to compile. Indeed, 
we get 
into a memory eating loop with the preprocessed source files I attach 
(it quickly runs into the 500-600 MB range and then eventually crashes 
for me). Removing the cause of the warning messages  
  x.ii:34314: warning: ignoring packed attribute on unpacked non-POD field 
    `MD5Hash PACKET_HEADER::hash' 
  x.ii:34315: warning: ignoring packed attribute on unpacked non-POD field 
   `MD5Hash PACKET_HEADER::setid' 
makes the problem to go away, though. Compile line is simply 
  c++ x.ii 
 
With 3.3.4, I get an ICE somewhere in the libstdc++ parts of 3.4, so I can't 
say from the preprocessed sources (all that I have left on my harddisk right 
now) whether this is a regression. 
 
I don't have the time to reduce memory hogs at present, so if someone else 
is interested in picking this up, feel free to. 
 
Wolfgang

-- 
           Summary: Runs out of memory with packed structs
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bangerth at dealii dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15209