GNUstep under Ubuntu Linux

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Update intro and explain compilation at bottom of page.
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 + Objective-C under Ubuntu Linux
 +== Compiling manually ==
-# -----------------------------------------------------------------+The compilation instructions below are divided into two steps.
-# Objective C 2.0 on Ubuntu (from source)+The first step compiles the *base* (non-graphical) parts of GNUStep, including setting up the Objective-C compiler.
-# -----------------------------------------------------------------+The second step compiles the graphical parts of GNUStep.
-# 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)+
-# -----------------------------------------------------------------+
-# -----------------------------------------------------------------+
-# ==============================+Some notes:
-# ==============================+
-# PART 1: new libobjc2 on Ubuntu+
-# ==============================+
-# ==============================+
-# --------------------------------------------------------------------+* We use clang and libobjc2 for all the new features like ARC, Blocks, etc.
-# Some examples to test Objective C and ARC once we get it installed+* Tested on fresh installs of (and likely with a more completed installation of):
-# --------------------------------------------------------------------+* Ubuntu 12.10 Server.
 +* Ubuntu 13.10 Desktop.
 +* Ubuntu 12.04 LTS Desktop, see bottom of the page for important info.
 + 
 +After installing everything below, you could install EtoileOS: see [[EtoileOS under Ubuntu Linux]].
 + 
 +<pre>
 +sudo apt-get install aptitude
 +# Dependencies
 +sudo aptitude -y install build-essential git subversion ninja cmake
 +# Dependencies for GNUStep Base
 +sudo aptitude -y install libffi-dev libxml2-dev libgnutls-dev libicu-dev
 +# Dependencies for libdispatch
 +sudo aptitude -y install libblocksruntime-dev libkqueue-dev libpthread-workqueue-dev autoconf libtool
cd ~ cd ~
 +git clone git://github.com/nickhutchinson/libdispatch.git
 +svn co http://svn.gna.org/svn/gnustep/modules/core
 +svn co http://svn.gna.org/svn/gnustep/libs/libobjc2/trunk libobjc2
 +svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
 +cd llvm/tools
 +svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
 +
 +cd ~/llvm
 +mkdir build
 +cd build
 +cmake ..
 +make -j8 # 8=your number of build CPUs
 +
 +echo "export PATH=\$PATH:~/llvm/build/bin" >> ~/.bashrc
 +echo "export CC=clang" >> ~/.bashrc
 +echo "export CXX=clang++" >> ~/.bashrc
 +source ~/.bashrc
 +clang -v
 +clang++ -v
 +
 +cd ~/libobjc2
 +mkdir build
 +cd build
 +cmake ..
 +make -j8
 +sudo -E make install
 +
 +cd ~/core/make
 +./configure --enable-debug-by-default --with-layout=gnustep --enable-objc-nonfragile-abi
 +make && sudo -E make install
 +echo ". /usr/GNUstep/System/Library/Makefiles/GNUstep.sh" >> ~/.bashrc
 +source ~/.bashrc
 +
 +sudo /sbin/ldconfig
 +
 +cd ~/core/base/
 +./configure
 +make -j8
 +sudo -E make install
 +
 +cd ~/libdispatch
 +sh autogen.sh
 +./configure CFLAGS="-I/usr/include/kqueue" LDFLAGS="-lkqueue -lpthread_workqueue -pthread -lm"
 +make -j8
 +sudo -E make install
 +sudo ldconfig
 +
 +# ----------------------------------------------------------------------------------------
 +# TEST COMPILING SOME CODE FROM THE INTERNET
 +# ----------------------------------------------------------------------------------------
 +
 +You can compile the following code with:
 +
 +clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobjc-runtime=gnustep -fblocks -fobjc-arc -lobjc blocktest.m
 +
 +clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobjc-runtime=gnustep -fblocks -lobjc -ldispatch -lgnustep-base Fraction.m helloGCD_objc.m
 +
 +
 +
 +cat > blocktest.m << EOF
 +#include <stdio.h>
 +
 +int main() {
 + void (^hello)(void) = ^(void) {
 + printf("Hello, block!\n");
 + };
 + hello();
 + return 0;
 +}
 +EOF
 +
 +cat > helloGCD_objc.m << 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
cat > Fraction.h << EOF cat > Fraction.h << EOF
Line 73: Line 172:
 +# ------------------------------------------------------
 +# STEP 2: INSTALLING GUI AND BACK
 +# (i.e., if you're running Ubuntu Desktop)
 +# ------------------------------------------------------
-cat > main.m << EOF+sudo aptitude install -y libjpeg-dev libtiff-dev libffi-dev
 +sudo aptitude install -y libcairo-dev libx11-dev:i386 libxt-dev
-#import <stdio.h>+cd ~/core/gui
-#import "Fraction.h"+./configure
 +make -j8
 +sudo -E make install
-int main( int argc, const char *argv[] ) {+cd ~/core/back
- // create a new instance+./configure
- Fraction *frac = [[Fraction alloc] init];+make -j8
 +sudo -E make install
- // set the values+You can compile the following code with:
- [frac setNumerator: 1];+
- [frac setDenominator: 3];+
- // print it+clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobjc-runtime=gnustep -fblocks -lobjc -fobjc-arc -ldispatch -lgnustep-base -lgnustep-gui guitest.m
- printf( "The fraction is: " );+
- [frac print];+
- printf( "\n" );+
- // free memory 
- [frac release]; 
- return 0; 
-} 
-EOF+cat > guitest.m << EOF
 +#import <AppKit/AppKit.h>
-cat > mainarc.m << EOF+int main()
-#import <stdio.h>+{
-#import "Fraction.h"+NSApplication *app; // Without these 2 lines, seg fault may occur
 +app = [NSApplication sharedApplication];
-int main( int argc, const char *argv[] ) {+NSAlert * alert = [[NSAlert alloc] init];
- // create a new instance+[alert setMessageText:@"Hello alert"];
- Fraction *frac = [[Fraction alloc] init];+[alert addButtonWithTitle:@"All done"];
- +[alert runModal];
- // 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 EOF
-# -----------------------------------------------------------------+</pre>
-# 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':+* General Note: When compiling your own code, it is generally good to tell clang both the family and version of the runtime: -fobjc-runtime=gnustep-1.7
- # dispatch_starfish.c:(.text+0x5bc): undefined reference to `_dispatch_host_time_data'+(The current version number can be had by looking at the latest ANNOUNCE filename in http://svn.gna.org/svn/gnustep/libs/libobjc2/trunk/ (e.g., ANNOUNCE.1.7))
- # 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+<b>Ubuntu 12.04 Help</b>
- sed "s/testing/#testing/" Makefile > Makefile.new+
- mv Makefile.new Makefile+
- make+
- sudo make install+
- sudo ldconfig+
-# --------------------------------------------------------------------+On Ubuntu 12.04, the default installed version of CMake is 2.8.7 but you need 2.8.8 or later to compile LLVM. And the default installed version of GCC and G++ is 4.6 but you need 4.8 or later to compile LLVM.
-# 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+For CMake, the solution is to download and compile CMake yourself. Use the existing CMake 2.8.7 and then replace it:
-./hi+
-clang -o hi helloGCD.c -fblocks -ldispatch+# Download the latest CMake version from the CMake web site (http://www.cmake.org/cmake/resources/software.html), and uncompress it in a folder.
-# /usr/bin/ld: /tmp/helloGCD-eXxFYY.o: undefined reference to symbol '_NSConcreteGlobalBlock'+# Create a _build directory in the CMake sources folder.
-# /usr/bin/ld: note: '_NSConcreteGlobalBlock' is defined in DSO /usr/lib/libBlocksRuntime.so.0 +# From the _build directory, run the following commands to build and install CMake from sources:
-# 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)+
 +<pre>
 +cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
 +make
 +cpack -G DEB
 +sudo apt-get remove cmake cmake-data
 +sudo dpkg -i cmake*.deb
 +</pre>
 +To get GCC and G++ 4.8, do the following:
-# --------------------------------------------------------------------+<pre>
-# Compiling Objective C with ARC and blocks and libdispatch+sudo add-apt-repository ppa:ubuntu-toolchain-r/test
-# --------------------------------------------------------------------+sudo apt-get update
-# Note: do not use -lBlocksRuntime here since Apple on is not +sudo apt-get install gcc-4.8 g++-4.8
-# compatible with the libobjc2 one which has its own. (Note from +sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
-# David Chisnall)+sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
-# --------------------------------------------------------------------+</pre>
-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+You should be good to go.
-./test+

Current revision

Objective-C under Ubuntu Linux

Compiling manually

The compilation instructions below are divided into two steps. The first step compiles the *base* (non-graphical) parts of GNUStep, including setting up the Objective-C compiler. The second step compiles the graphical parts of GNUStep.

Some notes:

  • We use clang and libobjc2 for all the new features like ARC, Blocks, etc.
  • Tested on fresh installs of (and likely with a more completed installation of):
  • Ubuntu 12.10 Server.
  • Ubuntu 13.10 Desktop.
  • Ubuntu 12.04 LTS Desktop, see bottom of the page for important info.

After installing everything below, you could install EtoileOS: see EtoileOS under Ubuntu Linux.

sudo apt-get install aptitude
# Dependencies
sudo aptitude -y install build-essential git subversion ninja cmake
# Dependencies for GNUStep Base
sudo aptitude -y install libffi-dev libxml2-dev libgnutls-dev libicu-dev 
# Dependencies for libdispatch
sudo aptitude -y install libblocksruntime-dev libkqueue-dev libpthread-workqueue-dev autoconf libtool

cd ~
git clone git://github.com/nickhutchinson/libdispatch.git
svn co http://svn.gna.org/svn/gnustep/modules/core
svn co http://svn.gna.org/svn/gnustep/libs/libobjc2/trunk libobjc2
svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
cd llvm/tools
svn co http://llvm.org/svn/llvm-project/cfe/trunk clang

cd ~/llvm
mkdir build
cd build
cmake ..
make -j8   # 8=your number of build CPUs

echo "export PATH=\$PATH:~/llvm/build/bin" >> ~/.bashrc
echo "export CC=clang"  >> ~/.bashrc
echo "export CXX=clang++" >> ~/.bashrc
source ~/.bashrc
clang -v
clang++ -v

cd ~/libobjc2
mkdir build
cd build
cmake ..
make -j8
sudo -E make install

cd ~/core/make
./configure --enable-debug-by-default --with-layout=gnustep --enable-objc-nonfragile-abi
make && sudo -E make install
echo ". /usr/GNUstep/System/Library/Makefiles/GNUstep.sh" >> ~/.bashrc
source ~/.bashrc

sudo /sbin/ldconfig

cd ~/core/base/
./configure
make -j8
sudo -E make install

cd ~/libdispatch
sh autogen.sh
./configure CFLAGS="-I/usr/include/kqueue" LDFLAGS="-lkqueue -lpthread_workqueue -pthread -lm"
make -j8
sudo -E make install
sudo ldconfig

# ----------------------------------------------------------------------------------------
# TEST COMPILING SOME CODE FROM THE INTERNET
# ----------------------------------------------------------------------------------------

You can compile the following code with:

clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobjc-runtime=gnustep -fblocks -fobjc-arc -lobjc  blocktest.m 

clang `gnustep-config --objc-flags` `gnustep-config --objc-libs` -fobjc-runtime=gnustep -fblocks -lobjc -ldispatch -lgnustep-base  Fraction.m helloGCD_objc.m



cat > blocktest.m << EOF
#include <stdio.h>

int main() {
    void (^hello)(void) = ^(void) {
        printf("Hello, block!\n");
    };
    hello();
    return 0;
}
EOF

cat > helloGCD_objc.m << 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

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


# ------------------------------------------------------
# STEP 2:  INSTALLING GUI AND BACK
# (i.e., if you're running Ubuntu Desktop)
# ------------------------------------------------------

sudo aptitude install -y libjpeg-dev libtiff-dev libffi-dev
sudo aptitude install -y libcairo-dev libx11-dev:i386 libxt-dev

cd ~/core/gui
./configure
make -j8
sudo -E make install

cd ~/core/back
./configure
make -j8
sudo -E make install

You can compile the following code with:

clang `gnustep-config --objc-flags` `gnustep-config --objc-libs`  -fobjc-runtime=gnustep -fblocks -lobjc -fobjc-arc -ldispatch -lgnustep-base -lgnustep-gui  guitest.m



cat > guitest.m << EOF
#import <AppKit/AppKit.h>

int main()
{
NSApplication *app;  // Without these 2 lines, seg fault may occur
app = [NSApplication sharedApplication];

NSAlert * alert = [[NSAlert alloc] init];
[alert setMessageText:@"Hello alert"];
[alert addButtonWithTitle:@"All done"];
[alert runModal];
}
EOF



  • General Note: When compiling your own code, it is generally good to tell clang both the family and version of the runtime: -fobjc-runtime=gnustep-1.7

(The current version number can be had by looking at the latest ANNOUNCE filename in http://svn.gna.org/svn/gnustep/libs/libobjc2/trunk/ (e.g., ANNOUNCE.1.7))


Ubuntu 12.04 Help

On Ubuntu 12.04, the default installed version of CMake is 2.8.7 but you need 2.8.8 or later to compile LLVM. And the default installed version of GCC and G++ is 4.6 but you need 4.8 or later to compile LLVM.

For CMake, the solution is to download and compile CMake yourself. Use the existing CMake 2.8.7 and then replace it:

  1. Download the latest CMake version from the CMake web site (http://www.cmake.org/cmake/resources/software.html), and uncompress it in a folder.
  2. Create a _build directory in the CMake sources folder.
  3. From the _build directory, run the following commands to build and install CMake from sources:
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
make
cpack -G DEB
sudo apt-get remove cmake cmake-data
sudo dpkg -i cmake*.deb

To get GCC and G++ 4.8, do the following:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.8 g++-4.8
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50

You should be good to go.