Xcode, OSX and Raspberry Pi

advanced
#1

Hi everyone,

Could we cross compiling from OSX (on Xcode) for Raspberry Pi ?

I seen that : http://openframeworks.cc/setup/raspberrypi/Raspberry-Pi-Cross-compiling-guide.html
But i don’t understand the part with VM and Parallel machine. Meanwhile I already have a Parallel installation on my mac !

#2

Yes you can. But only from Linux. So you will have to install Linux within parallels or Virtualbox (which I know has great support for linux)

I would download ubuntu it is the easiest to start with. http://www.ubuntu.com/download/desktop

#3

If you want to use Xcode to edit this is what I use for most of my OF/RPi projects. It doesn’t help with compiling ( I use the Terminal/SSH for that) but it does allow auto-completion

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#4

Are you really sure it’s not possible to compile OF for Raspberry on OSX with Xcode? And if so why?

I am actually successfully cross-compiling c++ projects for raspberry pi on OSX, but I can’t get it to work with OF yet…

Compiling works, but I’m having a lot of linker issues like: libdl.a(dlsym.o): In function `dlsym': (.text+0xc): undefined reference to `__dlsym'

I’d really love to completely stop compiling on raspberry at all. It’s sooo sloooow :slight_smile:

#5

I started by following this: http://www.jaredwolff.com/blog/cross-compiling-on-mac-osx-for-raspberry-pi/

#6

https://github.com/twobitcircus/rpi-build-and-boot I have been enjoying that setup for cross compiling.

#7

if you are using the makefiles, calling:

make RPI_TOOLS=path_to_compiler RPI_ROOT=path_to_RPI_system PLATFORM_OS=Linux  GST_VERSION=1.0 PLATFORM_ARCH=armv6l

should add the correct flags that avoid the linking issues

#8

That’s very interesting Arturo, I’ll give that a try. I was creating my makefile from scratch because the ones with the Raspberry version of OF became so complex.
I have been using the original make files as a guide though.

My approach is: first compiling on Raspberry pi and copying all the compiled libraries to my mac and using those in my home made makefile. I don’t really know for sure if that’s actually a good approach… what do you think?

#9

the OF makefiles are prepared to detect that you are crosscompiling and will add the correct flags, i’ve only used it under linux but i guess if you have the correct toolchain it should work the same under osx

#10

I’ve tried your suggestion, ( with the toolchain I got from http://www.jaredwolff.com/blog/cross-compiling-on-mac-osx-for-raspberry-pi/ ) but I’m stuck at

checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal openssl libpulse-simple alsa 
/bin/sh: pkg-config: command not found

I’m not familiar with pkg-config. Is it possible to compile / link without it?

#11

mmh, yeah you should run:

pkg-config cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal openssl libpulse-simple alsa --cflags

and

pkg-config cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal openssl libpulse-simple alsa --libs

to get the compile flags and libraries you need to use, and change every PKG_CONFIG_LIBRARY in the makefiles with the result of those 2 calls.

or you can install pkg-config on osx, i think it should be available through brew or similar

#12

Ah Yes, I’ll see if I can get pkg-config to work with homebrew!

Meanwhile I’ve continued working on my own simple makefile and I’ve run into this interesting warning:

/Volumes/xtools4/arm-none-linux-gnueabi/usr/include/features.h:326:0: warning: "__STDC_ISO_10646__" redefined [enabled by default]
 #define __STDC_ISO_10646__  200009L
 ^
In file included from <command-line>:0:0:
/Volumes/xtools4/arm-none-linux-gnueabi/arm-none-linux-gnueabi/sysroot/usr/include/stdc-predef.h:34:0: note: this is the location of the previous definition
 #define __STDC_ISO_10646__  201103L

and also this error:

/Volumes/xtools4/arm-none-linux-gnueabi/usr/lib/arm-linux-gnueabihf/libdl.a(dlsym.o): In function `dlsym':
(.text+0xc): undefined reference to `__dlsym'
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#13

I’ve installed pkg-config with brew, and when I call pkg-config from the terminal it shows that it exists and is found, but when I run the OF makefile, it still says

/bin/sh: pkg-config: command not found

This is the full fun report:

=================== config.mk platform detection ================


PLATFORM_ARCH=armv6l


PLATFORM_OS=Linux


PLATFORM_VARIANT=default


PLATFORM_LIB_SUBPATH=linuxarmv6l


=================== config.mk paths =============================


OF_ADDONS_PATH=../../../addons


OF_EXPORT_PATH=../../../export


OF_EXAMPLES_PATH=../../../examples


OF_APPS_PATH=../../../apps


OF_LIBS_PATH=../../../libs


OF_LIBS_OPENFRAMEWORKS_PATH=../../../libs/openFrameworks


OF_LIBS_OF_COMPILED_PATH=../../../libs/openFrameworksCompiled


OF_LIBS_OF_COMPILED_PROJECT_PATH=../../../libs/openFrameworksCompiled/project


OF_SHARED_MAKEFILES_PATH=../../../libs/openFrameworksCompiled/project/makefileCommon


OF_PLATFORM_MAKEFILES=../../../libs/openFrameworksCompiled/project/linuxarmv6l


OF_CORE_LIB_PATH=../../../libs/openFrameworksCompiled/lib/linuxarmv6l


/bin/sh: pkg-config: command not found


/bin/sh: pkg-config: command not found


/bin/sh: pkg-config: command not found
/bin/sh: pkg-config: command not found
/bin/sh: pkg-config: command not found
/bin/sh: pkg-config: command not found
Cat: /opt/vc/include/interface/vmcs_host/vc_dispmanx.h: No such file or directory

armv6l
checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal openssl libpulse-simple alsa 

/bin/sh: pkg-config: command not found

/Volumes/Archief/Library_Tim/Projecten/2014/24 RPI cross compile/_OF/of_v0.8.3_linuxarmv6/libs/openFrameworksCompiled/project/makefileCommon/config.shared.mk:260: *** couldn't find some pkg-config packages, did you run the latest install_dependencies.sh?.  Stop.
#14

have you tried to restart the computer, i think homebrew sometimes adds a path the first time it installs something it might be that the path is set in the console but not yet in the session

#15

I’ve tried it again after rebooting but, no luck. I still have the same exact errors.

#16

I’ve managed to get an OF project to compile for raspberry pi on OSX with my very own makefile!
There were some symlinks broken and some absolute paths inside a few .so files that needed to become relative.

Still didn’t get it to work with the standard OF makefiles though…

I’m documenting my progress on cross compiling right here:

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