swig rebottle for gnu+linux support

Formula/swig@4.1.1.rb

@@ -5,7 +5,7 @@ class SwigAT411 < Formula
  url "https://downloads.sourceforge.net/project/swig/swig/swig-4.1.1/swig-4.1.1.tar.gz"
  sha256 "2af08aced8fcd65cdb5cc62426768914bedc735b1c250325203716f78e39ac9b"
  license "GPL-3.0-only"
- revision 3
+ revision 4
 
  livecheck do
  url :stable
@@ -28,6 +28,7 @@ class SwigAT411 < Formula
 
  keg_only :versioned_formula
 
+ depends_on "ruby" => :test if OS.linux?
  depends_on "pcre2"
 
  uses_from_macos "ruby" => :test
@@ -47,8 +48,7 @@ def caveats
  EOS
  end
 
- # NOTE: add upstream python test this formula, #3
-
+ # NOTE: add upstream python test to this formula
  test do
  (testpath/"test.c").write <<~EOS
  int add(int x, int y)
@@ -67,9 +67,22 @@ def caveats
  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
+ if OS.mac?
+ 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"
+ else
+ ruby = Formula["ruby"]
+ args = Utils.safe_popen_read(
+ ruby.opt_bin/"ruby", "-e", "'puts RbConfig::CONFIG[\"LIBRUBYARG\"]'"
+ ).chomp
+ system ENV.cc, "-c", "-fPIC", "test.c"
+ system ENV.cc, "-c", "-fPIC", "test_wrap.c",
+ "-I#{ruby.opt_include}/ruby-#{ruby.version.major_minor}.0",
+ "-I#{ruby.opt_include}/ruby-#{ruby.version.major_minor}.0/x86_64-linux/"
+ system ENV.cc, "-shared", "test.o", "test_wrap.o", "-o", "test.so",
+ *args.delete("'").split
+ end
+ assert_equal "2", shell_output("ruby run.rb").strip
  end
 end