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>

2 files changed, 15 insertions, 7 deletions

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|
diff --git a/Library/Formula/slicot.rb b/Library/Formula/slicot.rb
index 578a19a0d..49277d596 100644
--- a/Library/Formula/slicot.rb
+++ b/Library/Formula/slicot.rb
@@ -14,19 +14,17 @@ class Slicot < Formula
     args = [
       "FORTRAN=#{ENV.fc}",
       "LOADER=#{ENV.fc}",
-      "LAPACKLIB='-framework Accelerate'",
     ]
 
     slicotlibname = "libslicot_pic.a"
     system "make", "lib", "OPTS=-fPIC", "SLICOTLIB=../#{slicotlibname}", *args
     lib.install "#{slicotlibname}"
-    system "make", "clean"
 
     if build.with? "default-integer-8"
+      system "make", "clean"
       slicotlibname = "libslicot64_pic.a"
       system "make", "lib", "OPTS=-fPIC -fdefault-integer-8", "SLICOTLIB=../#{slicotlibname}", *args
       lib.install "#{slicotlibname}"
-      system "make", "clean"
     end
   end
 end