[libdispatch-dev] Build and compile with libdispatch and -fobjc-arc on Linux

Frank Rehwinkel frankrehwinkel at gmail.com
Fri Mar 15 13:18:53 PDT 2013

Am looking for confirmation of what should be working and what build flags
to use to make this work.

On a Debian-based Linux system, Ubuntu 64-bit 12.04 or 12.10, using trunk
from libobjc2, for Objective-C code to use Clang's -fobjc-arc that also
wants to link with the libdispatch library,
what is the recommended set of flags for building libdispatch and for
building the code itself?

What I've tried so far hasn't worked but rather than clutter this first
post with all my attempts and the compiler error and later the execution
failure, I thought it worth checking that I am starting with the proper
base.  I have found nothing online about using libdispatch with automatic
reference counting on Linux.  Both are
such powerful tools I was surprised not to find this all spelled out
already so I wonder if it just works for others or if no one else has tried.

For the build of libdispatch, I followed this recipe:

    cd libdispatch-src
    sh autogen.sh
    ./configure CFLAGS="-I/usr/include/kqueue" LDFLAGS="-lkqueue
-lpthread_workqueue -pthread -lm"
    sudo -E make install
    sudo ldconfig

And to build the Objective-C source with GNUstep's libobjc2 runtime
library, I used these flags.

    clang testfile.m `gnustep-config --objc-flags` `gnustep-config
--objc-libs` -fobjc-runtime=gnustep-1.7 -fblocks  -lobjc -ldispatch

I'm using the svn trunk for libobjc2 as that has a recent bug fix for
blocks and ARC.  I pulled the libdispatch src from git://

If noone has any suggestion for a different build approach, I will attach
the compile error I ran into and then the runtime error that is left to
figure out.

Thank you,
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