swig@3 3.0.12 (new formula)

Closes #40882.

Signed-off-by: FX Coudert <fxcoudert@gmail.com>

Aliases/swig@4

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+../Formula/swig.rb

Formula/swig@3.rb

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+class SwigAT3 < Formula
+  desc "Generate scripting interfaces to C/C++ code"
+  homepage "http://www.swig.org/"
+  url "https://downloads.sourceforge.net/project/swig/swig/swig-3.0.12/swig-3.0.12.tar.gz"
+  sha256 "7cf9f447ae7ed1c51722efc45e7f14418d15d7a1e143ac9f09a668999f4fc94d"
+
+  keg_only :versioned_formula
+
+  depends_on "pcre"
+
+  def install
+    system "./configure", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}"
+    system "make"
+    system "make", "install"
+  end
+
+  test do
+    (testpath/"test.c").write <<~EOS
+      int add(int x, int y)
+      {
+        return x + y;
+      }
+    EOS
+    (testpath/"test.i").write <<~EOS
+      %module test
+      %inline %{
+      extern int add(int x, int y);
+      %}
+    EOS
+    (testpath/"run.rb").write <<~EOS
+      require "./test"
+      puts Test.add(1, 1)
+    EOS
+    system "#{bin}/swig", "-ruby", "test.i"
+    system ENV.cc, "-c", "test.c"
+    system ENV.cc, "-c", "test_wrap.c", "-I#{MacOS.sdk_path}/System/Library/Frameworks/Ruby.framework/Headers/"
+    system ENV.cc, "-bundle", "-undefined", "dynamic_lookup", "test.o", "test_wrap.o", "-o", "test.bundle"
+    assert_equal "2", shell_output("/usr/bin/ruby run.rb").strip
+  end
+end