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From: Gideon on 7 May 2010 20:46
I have MATLAB 2010a on my OS X 10.6 macbook, and it's run fine so
far. Recently, I tried to use MEX with some older C code I had, which
previously had worked fine. When trying to compile them I get the
following warnings:

ld: warning: in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/
libgsl.dylib, file was built for i386 which is not the architecture
being linked (x86_64)
ld: warning: in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/libstdc+
+.dylib, file was built for i386 which is not the architecture being
linked (x86_64)

I've seen some other posts on here about this, but it was unclear if
there was an actual resolution. As I'm also having trouble with
libstdc++.dylib, and not just libgsl, I suspect this is a systemwide
problem.
From: Brian Arnold on 10 May 2010 09:43
Hi Gideon,

It looks like you have installed the 64-bit version of MATLAB (maci64,
architecture x86_64), and the two libraries in question are 32-bit
libraries (architecture i386) which were manually built outside of
MATLAB in /usr/local/lib (since this path normally does not exist by
default), does that sound right?

You need to either recompile your older C code with CFLAGS, CXXFLAGS and
LDFLAGS set to include '-arch x86_64', or you need to install the 32-bit
version of MATLAB R2010a, to continue using the old MEX file and
libraries. Take a look at MATLAB's MEX command with the verbose option
('-v') to see what MATLAB uses to compile code with gcc, and make sure
your manually built libraries are compatible.

I would caution you strongly against using with a hand-built version of
libstdc++.dylib that was not provided by Apple. There is a high risk
that the runtime library doesn't match the system's, and this can lead
to subtle problems in your MEX file or other standalone code at runtime.

Good luck,

- Brian

Gideon wrote:
> I have MATLAB 2010a on my OS X 10.6 macbook, and it's run fine so
> far. Recently, I tried to use MEX with some older C code I had, which
> previously had worked fine. When trying to compile them I get the
> following warnings:
>
> ld: warning: in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/
> libgsl.dylib, file was built for i386 which is not the architecture
> being linked (x86_64)
> ld: warning: in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/libstdc+
> +.dylib, file was built for i386 which is not the architecture being
> linked (x86_64)
>
> I've seen some other posts on here about this, but it was unclear if
> there was an actual resolution. As I'm also having trouble with
> libstdc++.dylib, and not just libgsl, I suspect this is a systemwide
> problem.
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