[huskerlug] More of a GCC problem.
- From: "Jon Richardson" <jonpaulrichardson@xxxxxxxxxxx>
- To: huskerlug@xxxxxxxxxxxxx
- Date: Tue, 18 Mar 2003 09:12:03 +0000
Grr.... I'm fed up of buggy compilers, maybe it's just me? :) Anyways I'm
fairly new to gcc having ported my code from visual c++ 6. (Although this
code wasn't ported from visual c++ 6) I'm getting some strange results from
the output of my code.
The variable iLabelNode is a variable sized array declared as such:
int iBalance = 0;
int iLabelNode[iBalance];
The variable iBalance later changes to a larger value.
Here is the code where the problem occurs:
puts("<------------- FlowGraph Crap -------------->");
for (UINT m = 1; m <= oListLabel.Count(); ++m)
{
printf("%s = %d\n", oListLabel.Value(m), iLabelNode[m - 1]);
}
printf("iLabelNode[0] = %d\n", iLabelNode[0]);
//get actual count
m_iNodeCount -= iBalance;
printf("iLabelNode[0] = %d\n", iLabelNode[0]);
//create nodes
Node* pNode = 0;
for (int y = 0; y < m_iNodeCount; ++y)
{
pNode = new Node;
pNodeArray[y] = pNode;
}
printf("iLabelNode[0] = %d\n", iLabelNode[0]); //<-- screw up here
Can also be viewed here for pretty syntax highlighting :)
http://www.rafb.net/paste/results/P1014321.html
PORTION OF OUTPUT
<------------- FlowGraph Crap -------------->
IL_0006: = 4
IL_000e: = 6
iLabelNode[0] = 4
iLabelNode[0] = 4
iLabelNode[0] = 134587360
My question is why does the value of iLabelNode[0] change when it's clearly
not being modified? The funny thing is is that if I declare it as such "int
iLableNode[100]" it works fine. Should I just avoid variable sized arrays?
Am I doing something stupid I don't see?
Here is what the gcc manual says about variable sized arrays, didn't say
much but maybe I'm missing something.
http://gcc.gnu.org/onlinedocs/gcc-3.2.2/gcc/Variable-Length.html#Variable%20Length
If anyone could shed some light on this for me I would be very thankful,
this is driving me nuts.
Thanks,
Jon
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