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Re: Stange gcc 3.3 bug on Linux/ia64
H. J. Lu wrote:
It got stranger and stranger. I created a small Makefile to recreate
the problem. If I comment out
PWD = $${PWDCMD-pwd}
This changes the environment size, which in turn changes the stack
addresses of all local variables. This can affect several different
kinds of bugs. If there is code that takes the address of a stack
variable, and then does something to it, like create a hash index, then
you get different hash indices with different environment sizes. There
can also be problems if you have code reading an uninitialized local
variable, it may end up reading different garbage on the stack because
of different stack alignment/layout. Or if you have a stray pointer or
out-of-bounds array access to a stack slot, you can get different
behaviour with environment size changes.
Jim