New formula for installing gfortran 4.2.4 binaries

This formula enables preliminary support for Fortran-based brews in the
Hombrew project by providing a Fortran compiler- specifically a build of
gfortran 4.2.4 that incorporates Apple's patches to GCC.

These gfortran 4.2.4 binaries were created to support the compilation of
Fortran code used by the R Project for statistical computing by Simon
Urbanek and are sourced from:

  http://r.research.att.com/tools

The compilers are somewhat tied to specific versions of the XCode tool
chain. Therefore XCode version 3.1.4 is required on OS X 10.5.x and
XCode 3.2.2 is required on OS X 10.6.x for installation to take place.

Please read the caveats section of this brew for notes concerning the
creation of Fortran-based brews.

For more discussion concerning Fortran support in Homebrew see:

  http://github.com/mxcl/homebrew/issues/issue/72

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/Library/Formula/gfortran.rb b/Library/Formula/gfortran.rb
new file mode 100644
index 000000000..eec9f190e
--- /dev/null
+++ b/Library/Formula/gfortran.rb
@@ -0,0 +1,93 @@
+require 'formula'
+require 'brew.h'
+
+class GfortranPkgDownloadStrategy <CurlDownloadStrategy
+
+  def stage
+    # The 4.2.4 compiler is distributed as a OS X 10.5
+    # package- a single flat xar archive instead of a
+    # bundle.
+    safe_system "/usr/bin/xar -xf #{@tarball_path}"
+    chdir
+
+    # Clean up.
+    safe_system "mv *.pkg/Payload Payload.gz"
+    safe_system "ls | grep -v Payload | xargs rm -r"
+  end
+
+end
+
+class Gfortran <Formula
+
+  case gcc_42_build
+
+  when 5577
+    url 'http://r.research.att.com/gfortran-42-5577.pkg'
+    md5 '30fb495c93cf514003cdfcb7846dc701'
+    version "4.2.4-5577"
+
+  when 5659
+    url 'http://r.research.att.com/gfortran-42-5659.pkg'
+    md5 '71bd546baa45c9c0fb4943cdd72ee274'
+    version "4.2.4-5659"
+
+  else
+    onoe <<-EOS.undent
+      Currently the gfortran compiler provided by this brew is only supported
+      for XCode 3.1.4 on OS X 10.5.x and XCode 3.2.2 on OS X 10.6.x
+    EOS
+    exit
+
+  end
+
+  homepage 'http://r.research.att.com/tools/'
+
+  def download_strategy
+    GfortranPkgDownloadStrategy
+  end
+
+  # Shouldn't strip compiler binaries.
+  skip_clean [ 'bin', 'lib', 'libexec' ] 
+
+  def install
+
+    # The version of pax jumped 16 years in development between OS X 10.5
+    # and OS X 10.6. In that time it became security concious. Additionally,
+    # there are some slight variations in the packaging- because of this
+    # installation is broken down by XCode version.
+    case gcc_42_build
+    when 5577
+      ohai "Installing gfortran 4.2.4 for XCode 3.1.4 (build 5577)"
+      safe_system "pax -rz -f Payload.gz -s ',./usr,#{prefix},'"
+      # The 5577 package does not contain the gfortran->gfortran-4.2 symlink
+      safe_system "ln -sf #{bin + 'gfortran-4.2'} #{bin + 'gfortran'}"
+    when 5659
+      ohai "Installing gfortran 4.2.4 for XCode 3.2.2 (build 5659)"
+      safe_system "pax --insecure -rz -f Payload.gz -s ',./usr,#{prefix},'"
+    end
+  end
+
+  def caveats
+    caveats = <<-EOS
+Fortran compiler support in brews is currently experimental.  One of the
+consequences of this is that Homebrew does not set environment flags to ensure
+that a particular Fortran compiler is used and that the resulting code is
+optimized properly.  Therefore, in addition to using:
+
+    depends_on "gfortran"
+
+Fortran-based brews should also specify environment variables for the Fortran
+compiler in the install section:
+
+    # Select the Fortran compiler to be used:
+    ENV["FC"] = ENV["F77"] "\#{HOMEBREW_PREFIX}/bin/gfortran"
+
+    # Set Fortran optimization flags:
+    ENV["FFLAGS"] = ENV["FCFLAGS"] = ENV["CFLAGS"]
+
+Following these guidelines will allow Fortran-based brews to be easily edited so
+that alternate Fortran compilers, such as ifort, can be used instead of the
+version of gfortran provided by Homebrew.
+    EOS
+  end
+end