Add C++ compiler support option for some msvc build projects. (#10487)

By default, all projects are build using "default" compiler based on source
file extension. There is a property in mono.props, MONO_COMPILE_AS_CPP
 that could change this and build selected projects (eglib, libgcmonosgen,
libmini, libmono-dynamic, libmono-static, libmonodac, libmonoruntime,
libmonoutils, mono, monodis, monograph and pedump) using C++ compiler.

MONO_COMPILE_AS_CPP property could be set when calling msbuild
or through VS property manager IDE. Default value is false building using
"default" compiler (current behavior). When setting MONO_COMPILE_AS_CPP=true
the build prefix will be altered to make sure the C++ build gets its own build
folder, parallel to default build folders.

Example of building using C++ compiler from msbuild:

msbuild /p:PlatformToolset=v140 /p:Platform=x64 /p:Configuration=Release /p:MONO_TARGET_GC=sgen /p:MONO_COMPILE_AS_CPP=true msvc/mono.sln

1 files changed, 10 insertions, 3 deletions

diff --git a/msvc/mono.props b/msvc/mono.props
index 6098d6bf222..a673bb551b9 100644
--- a/msvc/mono.props
+++ b/msvc/mono.props
@@ -11,7 +11,7 @@
     <MONO_TARGET_GC>sgen</MONO_TARGET_GC>
     <!-- When true, build targets will get a suffix based on used GC. Makes it possible to have builds using different GC's in same build folders, sharing common targets. -->
     <MONO_USE_TARGET_SUFFIX>true</MONO_USE_TARGET_SUFFIX>
-    <!-- When true, build will get a separate build folder based on used GC. Makes it possible separate builds into different output folders under the same build prefix. -->
+    <!-- When true, build will get a separate build folder based on various configuration parameters. Makes it possible separate builds into different output folders under the same build prefix. -->
     <MONO_USE_SEPARATE_BUILD_DIR>true</MONO_USE_SEPARATE_BUILD_DIR>
     <!-- When true, all binaries and libraries will link using static c-runtime. When false, all binaries and libraries will link using dynamic c-runtime.  -->
     <MONO_USE_STATIC_C_RUNTIME>false</MONO_USE_STATIC_C_RUNTIME>
@@ -19,6 +19,8 @@
     <MONO_USE_STATIC_LIBMONO>false</MONO_USE_STATIC_LIBMONO>
     <!-- When true, mono binaries will link and include llvm. When false, mono binaries will not link and include llvm.  -->
     <MONO_ENABLE_LLVM>false</MONO_ENABLE_LLVM>
+    <!-- When true, ported mono projects will build using C++ instead of C compiler. When false, all project will be build using the default compiler.  -->
+    <MONO_COMPILE_AS_CPP>false</MONO_COMPILE_AS_CPP>
   </PropertyGroup>
   <PropertyGroup Label="MonoDirectories">
     <MonoSourceLocation Condition="'$(MonoSourceLocation)' == '' ">..</MonoSourceLocation>
@@ -52,14 +54,16 @@
     <GC_DEFINES>$(SGEN_DEFINES)</GC_DEFINES>
     <GC_LIB>libgcmonosgen.lib</GC_LIB>
     <MONO_TARGET_SUFFIX Condition="'$(MONO_USE_TARGET_SUFFIX)'=='true'">-sgen</MONO_TARGET_SUFFIX>
-    <MONO_BUILD_DIR_PREFIX Condition="'$(MONO_USE_SEPARATE_BUILD_DIR)'=='true'">$(MONO_BUILD_DIR_PREFIX)sgen/</MONO_BUILD_DIR_PREFIX>
+    <MONO_BUILD_DIR_PREFIX Condition="'$(MONO_USE_SEPARATE_BUILD_DIR)'=='true' And '$(MONO_COMPILE_AS_CPP)'!='true'">$(MONO_BUILD_DIR_PREFIX)sgen/</MONO_BUILD_DIR_PREFIX>
+    <MONO_BUILD_DIR_PREFIX Condition="'$(MONO_USE_SEPARATE_BUILD_DIR)'=='true' And '$(MONO_COMPILE_AS_CPP)'=='true'">$(MONO_BUILD_DIR_PREFIX)sgen-cpp/</MONO_BUILD_DIR_PREFIX>
   </PropertyGroup>
   <PropertyGroup Label="MonoBOEHM" Condition="$(MONO_TARGET_GC)=='boehm'">
     <BOEHM_DEFINES>HAVE_BOEHM_GC</BOEHM_DEFINES>
     <GC_DEFINES>$(BOEHM_DEFINES)</GC_DEFINES>
     <GC_LIB>libgc.lib</GC_LIB>
     <MONO_TARGET_SUFFIX Condition="'$(MONO_USE_TARGET_SUFFIX)'=='true'">-boehm</MONO_TARGET_SUFFIX>
-    <MONO_BUILD_DIR_PREFIX Condition="'$(MONO_USE_SEPARATE_BUILD_DIR)'=='true'">$(MONO_BUILD_DIR_PREFIX)boehm/</MONO_BUILD_DIR_PREFIX>
+    <MONO_BUILD_DIR_PREFIX Condition="'$(MONO_USE_SEPARATE_BUILD_DIR)'=='true'And '$(MONO_COMPILE_AS_CPP)'!='true'">$(MONO_BUILD_DIR_PREFIX)boehm/</MONO_BUILD_DIR_PREFIX>
+    <MONO_BUILD_DIR_PREFIX Condition="'$(MONO_USE_SEPARATE_BUILD_DIR)'=='true'And '$(MONO_COMPILE_AS_CPP)'=='true'">$(MONO_BUILD_DIR_PREFIX)boehm-cpp/</MONO_BUILD_DIR_PREFIX>
   </PropertyGroup>
   <PropertyGroup Label="Static-Mono-Libraries">
     <MONO_RUNTIME_LIBS>libmonoutils.lib;libmonoruntime$(MONO_TARGET_SUFFIX).lib;libmini$(MONO_TARGET_SUFFIX).lib;$(GC_LIB)</MONO_RUNTIME_LIBS>
@@ -109,6 +113,9 @@
     <BuildMacro Include="MONO_ENABLE_LLVM">
       <Value>$(MONO_ENABLE_LLVM)</Value>
     </BuildMacro>
+    <BuildMacro Include="MONO_COMPILE_AS_CPP">
+      <Value>$(MONO_COMPILE_AS_CPP)</Value>
+    </BuildMacro>
   </ItemGroup>
   <PropertyGroup Label="MonoDefaultPreprocessorDefinitions">
     <MONO_PREPROCESSOR_DEFINITIONS>__default_codegen__;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_DEPRECATE;HAVE_CONFIG_H;GC_NOT_DLL;WIN32_THREADS;WINVER=0x0601;_WIN32_WINNT=0x0601;_WIN32_IE=0x0501;_UNICODE;UNICODE;FD_SETSIZE=1024;NVALGRIND;$(MONO_ADDITIONAL_PREPROCESSOR_DEFINITIONS)</MONO_PREPROCESSOR_DEFINITIONS>