compcert 2.1

Closes Homebrew/legacy-homebrew#26702.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

Formula/compcert.rb

@@ -0,0 +1,35 @@
+require "formula"
+
+class Compcert < Formula
+  homepage "http://compcert.inria.fr"
+  url "http://compcert.inria.fr/release/compcert-2.1.tgz"
+  sha1 "1ec21e43c3ac778827522d385733e36d24c5f8d4"
+
+  depends_on "coq" => :build
+  depends_on "objective-caml" => :build
+  depends_on "camlp5" => :build
+
+  def install
+    # Compcert's configure script hard-codes gcc. On Lion and under, this
+    # creates problems since XCode's gcc does not support CFI,
+    # but superenv will trick it into using clang which does. This
+    # causes problems with the compcert compiler at runtime.
+    inreplace 'configure', '${toolprefix}gcc', "${toolprefix}#{ENV.cc}"
+
+    system "./configure", "-prefix", prefix, "ia32-macosx"
+    system "make", "all"
+    system "make", "install"
+  end
+
+  test do
+    (testpath/"test.c").write <<-EOS.undent
+      #include <stdio.h>
+      int main(int argc, char** argv) {
+        printf("Hello, world!\n");
+        return 0;
+      }
+    EOS
+    system "#{bin}/ccomp", "test.c", "-o", "test"
+    system "./test"
+  end
+end