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Re: [Discuss-gnuradio] MacPorts and GNU Radio 32-bit

From: Michael Dickens
Subject: Re: [Discuss-gnuradio] MacPorts and GNU Radio 32-bit
Date: Thu, 11 Feb 2010 08:15:45 -0500

hanks for all the feedback thus far! Can those of you on this thread return back to me the following (as executed in a terminal, individually):

gcc -v
uname -a

Once I figure out the logic (and, via the below discussion, I think I know what to do but I just want more info to confirm my beliefs), I can insert a warning or something into the portfile for wxgui so that this issue doesn't happen. - MLD

I think this is an OSX 10.6 32/64 bit issue, which I've worked around in GNU Radio already -- and as folks are finding, this error occurs in a background requirement (wxPython). IIRC:

* If you boot into 10.5 (which is mixed 32/64-bit, no matter the CPU), you get 32-bit compiling by default with the option of 64-bit via the '-arch x86_64' flag to the compiler. This behavior made sense because the kernel itself wasn't truly 64-bit.

* If you boot into 10.6 via the 32-bit kernel, then you get 32-bit compiling by default even if your CPU supports 64-bit compiling (just like 10.5, btw).

* If you boot into 10.6 via the 64-bit kernel (assuming your CPU supports it; not all do that can execute 10.6), then you get 64-bit compiling by default.

* A simple way to check to see which bit-size compiling is currently supported is to get "sizeof (void*)" and see if it is 4 or 8 (32 or 64 bit, respectively). Note that performing the test in this manner means one cannot make a "universal" executable via combining "-arch i386" and "-arch x86_64" ... you have to choose one way or the other. I've already implemented that change into the GNU Radio portfiles: when doing a universal install each file is compiled twice then the results merged together.

* wxPython ( -- the latest stable release) will currently compile only as 32-bit; the error folks are getting occurs when trying to compile wxPython as 64-bit.

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