1 files changed, 111 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/alternatives/lapack/default.nix b/nixpkgs/pkgs/build-support/alternatives/lapack/default.nix
new file mode 100644
index 000000000000..24c339042a2f
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/alternatives/lapack/default.nix
@@ -0,0 +1,111 @@
+{ lib, stdenv
+, lapack-reference, openblasCompat, openblas
+, is64bit ? false
+, lapackProvider ? if is64bit then openblas else openblasCompat }:
+
+let
+
+  version = "3";
+  canonicalExtension = if stdenv.hostPlatform.isLinux
+                       then "${stdenv.hostPlatform.extensions.sharedLibrary}.${version}"
+                       else stdenv.hostPlatform.extensions.sharedLibrary;
+
+  lapackImplementation = lib.getName lapackProvider;
+
+in
+
+assert is64bit -> (lapackImplementation == "openblas" && lapackProvider.blas64) || lapackImplementation == "mkl";
+
+stdenv.mkDerivation {
+  pname = "lapack";
+  inherit version;
+
+  outputs = [ "out" "dev" ];
+
+  meta = (lapackProvider.meta or {}) // {
+    description = "${lib.getName lapackProvider} with just the LAPACK C and FORTRAN ABI";
+  };
+
+  passthru = {
+    inherit is64bit;
+    provider = lapackProvider;
+    implementation = lapackImplementation;
+  };
+
+  dontBuild = true;
+  dontConfigure = true;
+  unpackPhase = "src=$PWD";
+
+  installPhase = (''
+  mkdir -p $out/lib $dev/include $dev/lib/pkgconfig
+
+  liblapack="${lib.getLib lapackProvider}/lib/liblapack${stdenv.hostPlatform.extensions.sharedLibrary}"
+
+  if ! [ -e "$liblapack" ]; then
+    echo "$liblapack does not exist, ${lapackProvider.name} does not provide liblapack."
+    exit 1
+  fi
+
+  cp -L "$liblapack" $out/lib/liblapack${canonicalExtension}
+  chmod +w $out/lib/liblapack${canonicalExtension}
+
+'' + (if stdenv.hostPlatform.parsed.kernel.execFormat.name == "elf" then ''
+  patchelf --set-soname liblapack${canonicalExtension} $out/lib/liblapack${canonicalExtension}
+  patchelf --set-rpath "$(patchelf --print-rpath $out/lib/liblapack${canonicalExtension}):${lapackProvider}/lib" $out/lib/liblapack${canonicalExtension}
+'' else if stdenv.hostPlatform.isDarwin then ''
+  install_name_tool -id liblapack${canonicalExtension} \
+                    -add_rpath ${lib.getLib lapackProvider}/lib \
+                    $out/lib/liblapack${canonicalExtension}
+'' else "") + ''
+
+  if [ "$out/lib/liblapack${canonicalExtension}" != "$out/lib/liblapack${stdenv.hostPlatform.extensions.sharedLibrary}" ]; then
+    ln -s $out/lib/liblapack${canonicalExtension} "$out/lib/liblapack${stdenv.hostPlatform.extensions.sharedLibrary}"
+  fi
+
+  install -D ${lib.getDev lapack-reference}/include/lapack.h $dev/include/lapack.h
+
+  cat <<EOF > $dev/lib/pkgconfig/lapack.pc
+Name: lapack
+Version: ${version}
+Description: LAPACK FORTRAN implementation
+Cflags: -I$dev/include
+Libs: -L$out/lib -llapack
+EOF
+
+  liblapacke="${lib.getLib lapackProvider}/lib/liblapacke${stdenv.hostPlatform.extensions.sharedLibrary}"
+
+  if ! [ -e "$liblapacke" ]; then
+    echo "$liblapacke does not exist, ${lapackProvider.name} does not provide liblapacke."
+    exit 1
+  fi
+
+  cp -L "$liblapacke" $out/lib/liblapacke${canonicalExtension}
+  chmod +w $out/lib/liblapacke${canonicalExtension}
+
+'' + (if stdenv.hostPlatform.parsed.kernel.execFormat.name == "elf" then ''
+  patchelf --set-soname liblapacke${canonicalExtension} $out/lib/liblapacke${canonicalExtension}
+  patchelf --set-rpath "$(patchelf --print-rpath $out/lib/liblapacke${canonicalExtension}):${lib.getLib lapackProvider}/lib" $out/lib/liblapacke${canonicalExtension}
+'' else if stdenv.hostPlatform.isDarwin then ''
+  install_name_tool -id liblapacke${canonicalExtension} \
+                    -add_rpath ${lib.getLib lapackProvider}/lib \
+                    $out/lib/liblapacke${canonicalExtension}
+'' else "") + ''
+
+  if [ -f "$out/lib/liblapacke.so.3" ]; then
+    ln -s $out/lib/liblapacke.so.3 $out/lib/liblapacke.so
+  fi
+
+  cp ${lib.getDev lapack-reference}/include/lapacke{,_mangling,_config}.h $dev/include
+
+  cat <<EOF > $dev/lib/pkgconfig/lapacke.pc
+Name: lapacke
+Version: ${version}
+Description: LAPACK C implementation
+Cflags: -I$dev/include
+Libs: -L$out/lib -llapacke
+EOF
+'' + stdenv.lib.optionalString (lapackImplementation == "mkl") ''
+  mkdir -p $out/nix-support
+  echo 'export MKL_INTERFACE_LAYER=${lib.optionalString is64bit "I"}LP64,GNU' > $out/nix-support/setup-hook
+'');
+}