From 49b2ef11ad0613d7e4e37a882ab3cb039ced992d Mon Sep 17 00:00:00 2001
From: Michael C. Grant
Date: Fri, 21 Mar 2014 17:22:51 -0500
Subject: qrupdate, slicot: improved BLAS/LAPACK support

qrupdate.rb: added OpenBLAS option. Compiled with -ff2c flag for
    -framework vecLib to ensure compatibility.
slicot.rb: removed all mention of BLAS/LAPACK, because only the static
    library is built.

Closes #27773.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
---
 Library/Formula/qrupdate.rb | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'Library/Formula/qrupdate.rb')

diff --git a/Library/Formula/qrupdate.rb b/Library/Formula/qrupdate.rb
index 24153c33a..43b971aa8 100644
--- a/Library/Formula/qrupdate.rb
+++ b/Library/Formula/qrupdate.rb
@@ -6,16 +6,26 @@ class Qrupdate < Formula
   sha1 'f7403b646ace20f4a2b080b4933a1e9152fac526'
 
   depends_on :fortran
-  depends_on 'dotwrp'
+  depends_on "homebrew/science/openblas" => :optional
 
   def install
     ENV.j1
     ENV['PREFIX'] = prefix
+    if build.with? 'openblas'
+      fflags = ENV.fcflags
+      lflags = "#{ENV.ldflags} -L#{Formula["openblas"].lib} -lopenblas"
+    else
+      # We're using the -ff2c flag here to avoid having to depend on dotwrp.
+      # Because qrupdate exports only subroutines, the resulting library is
+      # compatible with packages compiled with or without the -ff2c flag.
+      fflags = "#{ENV.fcflags} -ff2c"
+      lflags = "#{ENV.ldflags} -framework Accelerate"
+    end
     inreplace 'Makeconf' do |s|
       s.change_make_var! 'FC', ENV.fc
-      s.change_make_var! 'FFLAGS', ENV.fcflags
-      s.change_make_var! 'BLAS', "#{ENV.ldflags} -ldotwrp -framework Accelerate"
-      s.change_make_var! 'LAPACK', "#{ENV.ldflags} -ldotwrp -framework Accelerate"
+      s.change_make_var! 'FFLAGS', fflags
+      s.change_make_var! 'BLAS',   lflags
+      s.change_make_var! 'LAPACK', ""
     end
     cd "./src"
     inreplace 'Makefile' do |s|
-- 
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