From 44c3859a9725a5fb41e374ba91b52459498b8f17 Mon Sep 17 00:00:00 2001
From: Tomasz Dąbrowski <t.dabrowski@rock-hard.eu>
Date: Wed, 23 Nov 2016 11:59:26 +0100
Subject: Fix for compiling mruby as C++ on Visual Studio toolchain

---
 tasks/mruby_build.rake          | 2 +-
 tasks/mruby_build_commands.rake | 1 +
 tasks/toolchains/gcc.rake       | 2 ++
 tasks/toolchains/visualcpp.rake | 2 ++
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/tasks/mruby_build.rake b/tasks/mruby_build.rake
index cde996aae..bd911493d 100644
--- a/tasks/mruby_build.rake
+++ b/tasks/mruby_build.rake
@@ -120,7 +120,7 @@ module MRuby
     def enable_cxx_abi
       return if @cxx_exception_disabled or @cxx_abi_enabled
       compilers.each { |c| c.defines += %w(MRB_ENABLE_CXX_EXCEPTION) }
-      compilers.each { |c| c.flags << '-x c++'}
+      compilers.each { |c| c.flags << c.cxx_compile_flag }
       linker.command = cxx.command if toolchains.find { |v| v == 'gcc' }
       @cxx_abi_enabled = true
     end
diff --git a/tasks/mruby_build_commands.rake b/tasks/mruby_build_commands.rake
index f4805f46d..d688077ff 100644
--- a/tasks/mruby_build_commands.rake
+++ b/tasks/mruby_build_commands.rake
@@ -41,6 +41,7 @@ module MRuby
   class Command::Compiler < Command
     attr_accessor :flags, :include_paths, :defines, :source_exts
     attr_accessor :compile_options, :option_define, :option_include_path, :out_ext
+    attr_accessor :cxx_compile_flag
 
     def initialize(build, source_exts=[])
       super(build)
diff --git a/tasks/toolchains/gcc.rake b/tasks/toolchains/gcc.rake
index 4897e8c52..e4680b632 100644
--- a/tasks/toolchains/gcc.rake
+++ b/tasks/toolchains/gcc.rake
@@ -6,6 +6,7 @@ MRuby::Toolchain.new(:gcc) do |conf, _params|
     cc.option_include_path = '-I%s'
     cc.option_define = '-D%s'
     cc.compile_options = '%{flags} -MMD -o %{outfile} -c %{infile}'
+    cc.cxx_compile_flag = '-x c++'
   end
 
   [conf.cxx].each do |cxx|
@@ -15,6 +16,7 @@ MRuby::Toolchain.new(:gcc) do |conf, _params|
     cxx.option_include_path = '-I%s'
     cxx.option_define = '-D%s'
     cxx.compile_options = '%{flags} -MMD -o %{outfile} -c %{infile}'
+    cxx.cxx_compile_flag = '-x c++'
   end
 
   conf.linker do |linker|
diff --git a/tasks/toolchains/visualcpp.rake b/tasks/toolchains/visualcpp.rake
index 52820656b..5f5bab9c2 100644
--- a/tasks/toolchains/visualcpp.rake
+++ b/tasks/toolchains/visualcpp.rake
@@ -7,6 +7,7 @@ MRuby::Toolchain.new(:visualcpp) do |conf, _params|
     cc.option_include_path = '/I%s'
     cc.option_define = '/D%s'
     cc.compile_options = "%{flags} /Fo%{outfile} %{infile}"
+    cc.cxx_compile_flag = '/TP'
   end
 
   conf.cxx do |cxx|
@@ -16,6 +17,7 @@ MRuby::Toolchain.new(:visualcpp) do |conf, _params|
     cxx.option_include_path = '/I%s'
     cxx.option_define = '/D%s'
     cxx.compile_options = "%{flags} /Fo%{outfile} %{infile}"
+    cxx.cxx_compile_flag = '/TP'
   end
 
   conf.linker do |linker|
-- 
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