RE: synthesised variables on 64-bit
RE: synthesised variables on 64-bit
- Subject: RE: synthesised variables on 64-bit
- From: "Randy Widell" <email@hidden>
- Date: Mon, 6 Oct 2008 15:40:44 -0400
> Are you running the app in the debugger? If you're building a 4-way
> universal binary, then the debugger will always launch the 32-bit
> version of the executable, even if you're using a 64-bit Mac.
>
> If you want to build the app for 64-bit only, then you have to
> manually set the architectures to "ppc64 x86_64" instead of using a
> pre-set value. Also, Xcode 3.1's debugger doesn't work correctly with
> 64-bit executables. I haven't checked to see if they fixed this bug in
> 3.1.1, but they did work correctly in 3.0.
This brings up a question I had a while ago, but never asked and about which
I forgot. I tried making a 64-bit app in Xcode 3.0 a while ago and set the
architectures, as you mentioned, to "ppc64 x86_64". When I ran the app,
sizeof(long) was still 4 on a Core2 Duo running Leopard. I found a compiler
option called "Use 64-bit Math". After enabling that, sizeof(long) was 8.
I was never sure if that was correct behavior, but, as I said, I just forgot
about it.
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