I'm attempting to use the ZeroMQ library in an iPhone app developed in C# using
MonoTouch. I've solved almost all of the problems, but have fallen at the last
hurdle. I'm using ZeroMQ 2.1.10, and the C# CLR binding/wrapper, and developing
in Mac OS X 10.6.8. Here's the story so far:
I first attempted to use ZeroMq in a simple Mono C# Console app. I built ZeroMQ
with ./configure, then make and sudo make install, which installs shared
library/usr/local/lib/libzmq.dylib. The ZeroMq C# binding clrzmq.dll is a
wrapper that uses the 'core' ZeroMq functionality via C Api `[DllImport] calls.
The test app didn't work, which I figured out to be that the standard ZeroMQ
./configure produces a 64-bit output, and Mono is only 32 bit. I then rebuilt
ZeroMQ with
./configure CFLAGS="-O -arch i386" CXXFLAGS="-O -arch i386" LDFLAGS="-arch
i386" --disable-dependency-tracking
My simple C# ZeroMq app then worked correctly.
Moving on, I then tried to use ZeroMq from inside an iPhone app in the iPhone
simulator. I discovered that the iPhone only allows statically linked libraries
(no dynamic libraries allowed). This is achieved by changing all the C# wrapper
calls to
[DllImport("__Internal", CallingConvention = CallingConvention.Cdecl)]
and including libzmq.a directly in the MonoTouch project, and setting extra
mtouch arguments
-cxx -gcc_flags "-L${ProjectDir} -lzmq -force_load ${ProjectDir}/libzmq.a"
to ensure the ZeroMQ library is included in the iPhone app.
When running the app in the iPhone simulator, it crashed out, which I traced to
a call made from azmq_init() to socketpair. I finally traced this to the ZeroMQ
library having been built against my build machine's MacOS headers and
libraries, instead of against the iPhone SDK. This was fixed by
./configure CFLAGS="-O -arch i386 -isysroot
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk"
CXXFLAGS="-O -arch i386 -isysroot
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk"
LDFLAGS="-arch i386" --disable-dependency-tracking
Success in the iPhone Simulator! The simulator requires i386 static libraries
built to the iPhone simulator SDK. I now can use ZeroMQ functionality within an
iPhone app in the Simulator ONLY. It does not work however on a real iPhone.
This is because a real iPhone requires a library that has been built for the
ARM architecture, and against the real iPhoneOS SDK.
(There is a side-issue of building 3 separate libraries - i386, ARM6, and ARM7,
and combining all 3 into 'fat' library that can be used in any environment. I
need to be able to build for ARM before I get to this problem).
** Finally, my question!! **
The last step is to cross-compile build the ZeroMQ library to ARM. I have been
trying all day long to come up with the correct switches for this, and studied
all the examples on the internet that I can find, but none seem to have a
solution that works.
The closest I have got to working is:
./configure
CXX=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-g++-4.2
CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2
LD=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ld CFLAGS="-O
-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk"
CXXFLAGS="-O -isysroot
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk"
--disable-dependency-tracking --host=arm-apple-darwin10
LDFLAGS="-isysroot
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk"
AR=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ar
AS=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/as
LIBTOOL=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/libtool
STRIP=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/strip
RANLIB=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ranlib
This produces a config which make compiles the ZeroMq code, but fails with lots
of link errors, e.g.:
ar: libzmq_la-clock.o: No such file or directory
I've tried many other configurations, but they don't even pass ./configure
correctly.
Can anyone help me with a suitable ./configure parameter list to produce an ARM
architecture static library? This is all I need to get ZeroMQ working on a real
iPhone.
And and all help much appreciated!
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