GNUstep under Ubuntu Linux

# -----------------------------------------------------------------
# Objective C 2.0 on Ubuntu (from source)
# -----------------------------------------------------------------
# PART 1: LIBOBJC2 from source (with ARC)
# PART 2: LIBDISPATCH from source
# ON UBUNTU 12.04 SERVER
# -----------------------------------------------------------------
# Step 1 based on David Chisnall (http://etoileos.com/news/archive/2011/08/14/1206/)
# Step 2 based on Chris Mowforth http://chris.mowforth.com/installing-grand-central-dispatch-on-linux)
# -----------------------------------------------------------------
# -----------------------------------------------------------------

# ==============================
# ==============================
# PART 1: new libobjc2 on Ubuntu
# ==============================
# ==============================

# --------------------------------------------------------------------
# Some examples to test Objective C and ARC once we get it installed
# --------------------------------------------------------------------

cd ~

cat > Fraction.h << EOF

#import <Foundation/NSObject.h>

@interface Fraction: NSObject {
   int numerator;
   int denominator;
}

-(void) print;
-(void) setNumerator: (int) n;
-(void) setDenominator: (int) d;
-(int) numerator;
-(int) denominator;
@end

EOF


cat > Fraction.m << EOF
#import "Fraction.h"
#import <stdio.h>

@implementation Fraction
-(void) print {
   printf( "%i/%i", numerator, denominator );
}

-(void) setNumerator: (int) n {
   numerator = n;
}

-(void) setDenominator: (int) d {
   denominator = d;
}

-(int) denominator {
   return denominator;
}

-(int) numerator {
   return numerator;
}
@end

EOF



cat > main.m << EOF

#import <stdio.h>
#import "Fraction.h"

int main( int argc, const char *argv[] ) {
   // create a new instance
   Fraction *frac = [[Fraction alloc] init];

   // set the values
   [frac setNumerator: 1];
   [frac setDenominator: 3];

   // print it
   printf( "The fraction is: " );
   [frac print];
   printf( "\n" );

   // free memory
   [frac release];

   return 0;
}

EOF

cat > mainarc.m << EOF
#import <stdio.h>
#import "Fraction.h"

int main( int argc, const char *argv[] ) {
   // create a new instance
   Fraction *frac = [[Fraction alloc] init];

   // set the values
   [frac setNumerator: 1];
   [frac setDenominator: 3];

   // print it
   printf( "The fraction is: " );
   [frac print];
   printf( "\n" );

   // free memory
   // [frac release];  // valgrind should show less leakage with -fobjc-arc

   return 0;
}

EOF


# -----------------------------------------------------------------
# INITIAL REQUIREMENTS
# -----------------------------------------------------------------
sudo apt-get -y install build-essential subversion clang libicu-dev libxml2-dev libxml2  libgnutls-dev libssl-dev

#sudo apt-get -y install gnustep            # If you want old runtime
#sudo apt-get -y install gnustep-make         
#sudo apt-get -y install libgnustep-base-dev

sudo apt-get -y install gobjc                # Def required for below.

# --------------------------------------------------------------------
# TEST (may fail w/ segfault if you did not apt-get install gnustep)
# --------------------------------------------------------------------

cd ~
gcc `gnustep-config --objc-flags` main.m  Fraction.m -o test -lobjc -lgnustep-base
./test
clang `gnustep-config --objc-flags` main.m  Fraction.m -o test -lobjc -lgnustep-base
./test

# --------------------------------------------------------------------
# OK, let's install the new GNUstep from Subversion repositories!
# (based on David Chisnall http://etoileos.com/news/archive/2011/08/14/1206/)
# --------------------------------------------------------------------
mkdir gs
cd gs

svn co svn://svn.gna.org/svn/gnustep/tools/make/trunk make
svn co http://svn.gna.org/svn/gnustep/modules/core
svn co svn://svn.gna.org/svn/gnustep/libs/libobjc2/trunk libobjc

# --------------------------------------------------------------------
# 1) Install GNUstep Make a first time.
# --------------------------------------------------------------------

cd ~/gs/make
export CC=clang 
export CXX=clang++ 
./configure --enable-debug-by-default --with-layout=fhs
make && sudo -E make install
. /usr/local/share/GNUstep/Makefiles/GNUstep.sh
cd ..

cd ~/gs/core/base
./configure 
make            # On this FIRST TIME THRU, WILL SAY CAN'T BUILD NSBLOCKS for this runtime
sudo make install
cd ..

# --------------------------------------------------------------------
# TEST (the resulting binary will segfault if we don't have a runtime)
# --------------------------------------------------------------------
cd ~
clang `gnustep-config --objc-flags` main.m  Fraction.m -o test -lobjc -lgnustep-base


# --------------------------------------------------------------------
# 2) Build libobjc2
# --------------------------------------------------------------------
cd ~/gs/libobjc
make -f Makefile
sudo make -f Makefile install
cd ..

# --------------------------------------------------------------------
# 3) NOW GO BACK, RECOMPILE GNUStep MAKE (TO DETECT THE NEW OBJC RUNTIME) 
# --------------------------------------------------------------------

cd ~/gs/make
./configure  --enable-objc-nonfragile-abi --enable-native-objc-exceptions --with-layout=fhs --enable-debug-by-default CC=clang CXX=clang++
make && sudo -E make install
. /usr/local/share/GNUstep/Makefiles/GNUstep.sh
cd ..

# --------------------------------------------------------------------
# 4) AND THEN RECOMPILE CORE/BASE
# --------------------------------------------------------------------

cd ~/core/base
./configure --disable-mixedabi CC=clang CXX=clang++ 
make            # THIS TIME THRU, NO COMPLAINTS ABOUT BLOCKS
sudo make install
cd ..

# --------------------------------------------------------------------
# 5) FINALLY TEST AGAIN AND ENJOY OBJECTIVE C WITH ARC
# Note that I need to add GNUSTEP-CONFIG --OBJC-LIBS below.
# If you don't want ARC, omit -fobj-arc
# --------------------------------------------------------------------

cd ~
clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobj-arc -fobjc-nonfragile-abi mainarc.m  Fraction.m -o test -lobjc -lgnustep-base
./test



# ==============================
# ==============================
# PART 2: libdispatch on Ubuntu
# ==============================
# ==============================



# --------------------------------------------------------------------
# Some examples to test GCD once we get it installed
# --------------------------------------------------------------------

cd ~

cat > helloGCD.c << EOF
#include <dispatch/dispatch.h>
#include <stdio.h>

int main() {
 dispatch_queue_t queue = dispatch_queue_create(NULL, NULL); 

 dispatch_sync(queue, ^{
   printf("Hello, world from a dispatch queue!\n");
 });

 dispatch_release(queue);

 return 0;
}

EOF

cat > helloGCD_objc.c << EOF

#include <dispatch/dispatch.h>
#import <stdio.h>
#import "Fraction.h"

int main( int argc, const char *argv[] ) {
   dispatch_queue_t queue = dispatch_queue_create(NULL, NULL); 
   Fraction *frac = [[Fraction alloc] init];

   [frac setNumerator: 1];
   [frac setDenominator: 3];

   // print it
   dispatch_sync(queue, ^{
     printf( "The fraction is: " );
     [frac print];
     printf( "\n" );
   });
   dispatch_release(queue);

   return 0;
}

EOF

# --------------------------------------------------------------------
# INSTALLING LIBDISPATCH
# (based on Chris Mowforth http://chris.mowforth.com/installing-grand-central-dispatch-on-linux)
# --------------------------------------------------------------------

sudo apt-get install clang libblocksruntime-dev libkqueue-dev

# Visit  http://packages.ubuntu.com/oneiric/libpthread-workqueue0 for download links
# Visit  http://packages.ubuntu.com/oneiric/libpthread-workqueue-dev for download link

mkdir dispatch
cd dispatch
sudo apt-get install make autoconf autogen libtool build-essential gcc-multilib
sudo apt-get install pkg-config

wget http://mirror.pnl.gov/ubuntu//pool/universe/libp/libpthread-workqueue/libpthread-workqueue0_0.8.2-1_amd64.deb
wget http://mirror.pnl.gov/ubuntu//pool/universe/libp/libpthread-workqueue/libpthread-workqueue-dev_0.8.2-1_amd64.deb

sudo dpkg -i libpthread-workqueue0_0.8.2-1_amd64.deb 
sudo dpkg -i libpthread-workqueue-dev_0.8.2-1_amd64.deb 

wget http://archive.ubuntu.com/ubuntu/pool/universe/libd/libdispatch/libdispatch_0~svn197.orig.tar.gz

tar xvfz libdispatch_0~svn197.orig.tar.gz 
cd libdispatch-0~svn197/
 export CC=clang 
 export CXX=clang++
 make distclean
 ./configure
 make

 # dispatch_starfish.o: In function `_dispatch_time_mach2nano':
 # dispatch_starfish.c:(.text+0x5bc): undefined reference to `_dispatch_host_time_data'
 # dispatch_starfish.c:(.text+0x5ea): undefined reference to `_dispatch_get_host_time_init'
 # /usr/bin/ld: .libs/dispatch_starfish: hidden symbol `_dispatch_host_time_data' isn't defined
 # /usr/bin/ld: final link failed: Bad value
 # clang: error: linker command failed with exit code 1 (use -v to see invocation)
 # make[1]: *** [dispatch_starfish] Error 1
 # make[1]: Leaving directory `/home/patryk/dispatch/libdispatch-0~svn197/testing'
 # make: *** [all-recursive] Error 1

 # --------------------------------------------------------------------
 # To fix compile, comment out build of "testing" from Makefile
 # --------------------------------------------------------------------

 make clean
 sed "s/testing/#testing/" Makefile > Makefile.new
 mv Makefile.new Makefile
 make
 sudo make install
 sudo ldconfig

# --------------------------------------------------------------------
# Testing
# --------------------------------------------------------------------
# Plain C: When not compiling with libobjc2 (just plain C) on Ubuntu you must add -lBlocksRuntime
# --------------------------------------------------------------------

clang -o hi helloGCD.c -fblocks -ldispatch -lBlocksRuntime
./hi

clang -o hi helloGCD.c -fblocks -ldispatch
# /usr/bin/ld: /tmp/helloGCD-eXxFYY.o: undefined reference to symbol '_NSConcreteGlobalBlock'
# /usr/bin/ld: note: '_NSConcreteGlobalBlock' is defined in DSO /usr/lib/libBlocksRuntime.so.0 
# so try adding it to the linker command line
# /usr/lib/libBlocksRuntime.so.0: could not read symbols: Invalid operation
# clang: error: linker command failed with exit code 1 (use -v to see invocation)



# --------------------------------------------------------------------
# Compiling Objective C with ARC and blocks and libdispatch
# --------------------------------------------------------------------
# Note: do not use -lBlocksRuntime here since Apple on is not 
# compatible with the libobjc2 one which has its own. (Note from 
# David Chisnall)
# --------------------------------------------------------------------

clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobj-arc -fobjc-nonfragile-abi -fblocks  helloGCD_objc.m Fraction.m -o test -lobjc -lgnustep-base -ldispatch
./test