INSTALL

   1 Grand Central Dispatch (GCD)
   2
   3 GCD is a concurrent programming framework first shipped with Mac OS X Snow
   4 Leopard.  This package is an open source bundling of libdispatch, the core
   5 user space library implementing GCD.  At the time of writing, support for
   6 the BSD kqueue API, and specifically extensions introduced in Mac OS X Snow
   7 Leopard and FreeBSD 9-CURRENT, are required to use libdispatch.  Other
   8 systems are currently unsupported.
   9
  10   Configuring and installing libdispatch
  11
  12 GCD is built using autoconf, automake, and libtool, and has a number of
  13 compile-time configuration options that should be reviewed before starting.
  14 An uncustomized install requires:
  15
  16         sh autogen.sh
  17         ./configure
  18         make
  19         make install
  20
  21 The following configure options may be of general interest:
  22
  23 --with-apple-libc-source
  24
  25         Specify the path to Apple's Libc package, so that appropriate headers
  26         can be found and used.
  27
  28 --with-apple-libclosure-source
  29
  30         Specify the path to Apple's Libclosure package, so that appropriate headers
  31         can be found and used.
  32
  33 --with-apple-xnu-source
  34
  35         Specify the path to Apple's XNU package, so that appropriate headers
  36         can be found and used.
  37
  38 --with-blocks-runtime
  39
  40         On systems where -fblocks is supported, specify an additional library
  41         path in which libBlocksRuntime can be found.  This is not required on
  42         Mac OS X, where the Blocks runtime is included in libSystem, but is
  43         required on FreeBSD.
  44
  45 The following options are likely to only be useful when building libdispatch
  46 on Mac OS X as a replacement for /usr/lib/system/libdispatch.dylib:
  47
  48 --disable-libdispatch-init-constructor
  49
  50         Do not tag libdispatch's init routine as __constructor, in which case
  51         it must be run manually before libdispatch routines can be called.
  52         For the libdispatch library in /usr/lib/system, the init routine is called
  53         automatically during process start.
  54
  55 --enable-apple-tsd-optimizations
  56
  57         Use a non-portable allocation scheme for pthread per-thread data (TSD)
  58         keys when building libdispatch for /usr/lib/system on Mac OS X.  This
  59         should not be used on other OS's, or on Mac OS X when building a
  60         stand-alone library.
  61
  62   Typical configuration commands
  63
  64 The following command lines create the configuration required to build
  65 libdispatch for /usr/lib/system on Mac OS X Lion:
  66
  67         sh autogen.sh
  68         ./configure CFLAGS='-arch x86_64 -arch i386' \
  69                 --prefix=/usr --libdir=/usr/lib/system \
  70                 --disable-dependency-tracking --disable-static \
  71                 --disable-libdispatch-init-constructor \
  72                 --enable-apple-tsd-optimizations \
  73                 --with-apple-libc-source=/path/to/10.7.0/Libc-763.11 \
  74                 --with-apple-libclosure-source=/path/to/10.7.0/libclosure-53 \
  75                 --with-apple-xnu-source=/path/to/10.7.0/xnu-1699.22.73
  76
  77 Typical configuration line for FreeBSD 8.x and 9.x to build libdispatch with
  78 clang and blocks support:
  79
  80         sh autogen.sh
  81         ./configure CC=clang --with-blocks-runtime=/usr/local/lib