Install mig which is a Macos specific RPC code generator

Dockerfile.mri.erb

@@ -197,6 +197,18 @@ RUN printf "1\n" | update-alternatives --config <%= target %>-gcc && \
 COPY build/strip_wrapper_codesign /root/
 RUN mv /opt/osxcross/target/bin/<%= target %>-strip /opt/osxcross/target/bin/<%= target %>-strip.bin && \
     ln /root/strip_wrapper_codesign /opt/osxcross/target/bin/<%= target %>-strip
+
+# Install mig which is a Macos specific RPC code generator, which is part of xcode
+RUN apt-get -y update && \
+    apt-get install -y bison flex && \
+    rm -rf /var/lib/apt/lists/*
+RUN git clone --branch=cross_platform https://github.com/markmentovai/bootstrap_cmds && \
+    cd bootstrap_cmds && \
+    autoreconf --install && \
+    sh configure && \
+    make && \
+    sed -E -i 's/^cppflags=(.*)/cppflags=(\1 "-D<%= platform =~ /arm64/ ? "__arm64__" : "__x86_64__" %>" "-I\/opt\/osxcross\/target\/SDK\/MacOSX11.1.sdk\/usr\/include")/' migcom.tproj/mig.sh && \
+    sudo make install
 <% end %>
 
 <% if platform =~ /arm64-darwin/ %>

test/fixtures/mig_test_rpc.defs

@@ -0,0 +1,8 @@
+#include <mach/std_types.defs>
+#include <mach/mach_types.defs>
+
+subsystem mig_test_ipc 1;
+
+routine mig_test_call(
+                                server_port     : mach_port_t;
+                out             returnvalue     : int);

test/test_mig.rb

@@ -0,0 +1,18 @@
+require 'rake_compiler_dock'
+require 'test/unit'
+
+class TestMigCompile < Test::Unit::TestCase
+  TEST_PLATFORM = ENV["TEST_PLATFORM"] || 'arm64-darwin'
+
+  def test_mig_compile
+    omit "only on darwin platform" unless TEST_PLATFORM =~ /darwin/
+
+    RakeCompilerDock::Starter.sh "mig -header tmp/mig_test_rpc.h -user tmp/mig_test_rpc.c -sheader /dev/null -server /dev/null -I. test/fixtures/mig_test_rpc.defs ", platform: TEST_PLATFORM, verbose: false
+
+    h_file = File.read("tmp/mig_test_rpc.h")
+    assert_match /Request_mig_test_call/, h_file
+
+    c_file = File.read("tmp/mig_test_rpc.c")
+    assert_match /Reply__mig_test_call/, c_file
+  end
+end