On 18/12/11 12:37, Den Jean wrote:
Hi,
to interface with c libraries containing SSE code,
the stack must be aligned to 16 bytes.
Currently the default -mpreferred-stack-boundary=num of gcc provides for this.
However current fpc 2.4.4 does not align the stack as such.
I do not know if this correct or not when reading things like:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838#c8
http://groups.google.com/group/ia32-abi/browse_thread/thread/4f9b3e5069943bf1
Ow, we hit this problem. We are calling a library that uses opencv
(where SSE instructions are used). Luckily we can add -mstackrealign to
the CFLAGS of our library. People without an "interface" lib will be in
trouble, though.
Henry
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