Add build system for compiling under MSVC x64

This patch adds the modifications needed to compile under x64 under
Windows:
- created a new macro for testing if we are compiling under x64.
this will define the linker flag: "/MACHINE:X64" as per documentation
(https://msdn.microsoft.com/en-us/library/9yb4317s.aspx).

- added x64 pthread libraries under the pthread defines

- add documentation on how to build under x64

Signed-off-by: Alin Gabriel Serdean <[email protected]>
Signed-off-by: Gurucharan Shetty <[email protected]>

INSTALL.Windows.md

@@ -33,11 +33,20 @@ binaries.  In addition to that, if you want to compile the kernel module you
 will also need to install Windows Driver Kit (WDK) 8.1 Update.
 
 It is important to get the Visual Studio related environment variables and to
-have the $PATH inside the bash to point to the proper compiler and linker. One
-easy way to achieve this is to get into the "Developer Command prompt for visual
-studio" and through it enter into the bash shell available from msys by typing
+have the $PATH inside the bash to point to the proper compiler and linker.  One
+easy way to achieve this for VS2013 is to get into the "VS2013 x86 Native
+Tools Command Prompt" (in a default installation of Visual Studio 2013 this can
+be found under the following location:
+C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools\Shortcuts)
+and through it enter into the bash shell available from msys by typing
 'bash --login'.
 
+There is support for generating 64 bit binaries too.  To compile under x64,
+open the "VS2013 x64 Native Tools Command Prompt" (if your current running OS
+is 64 bit) or "VS2013 x64 Cross Tools Command Prompt" (if your current running
+OS is not 64 bit) instead of opening its x86 variant.  This will point the
+compiler and the linker to their 64 bit equivalent.
+
 If after the above step, a 'which link' inside MSYS's bash says,
 "/bin/link.exe", rename /bin/link.exe to something else so that the
 Visual studio's linker is used. You should also see a 'which sort' report

Makefile.am

@@ -19,6 +19,7 @@ AM_CPPFLAGS += -I $(top_srcdir)/datapath-windows/include
 AM_CPPFLAGS += $(PTHREAD_INCLUDES)
 AM_CPPFLAGS += $(MSVC_CFLAGS)
 AM_LDFLAGS += $(PTHREAD_LDFLAGS)
+AM_LDFLAGS += $(MSVC64_LDFLAGS)
 endif
 
 AM_CPPFLAGS += -I $(top_srcdir)/include

configure.ac

@@ -85,6 +85,7 @@ AC_SEARCH_LIBS([pthread_create], [pthread])
 AC_FUNC_STRERROR_R
 
 OVS_CHECK_ESX
+OVS_CHECK_WIN64
 OVS_CHECK_WIN32
 OVS_CHECK_VISUAL_STUDIO_DDK
 OVS_CHECK_COVERAGE

m4/openvswitch.m4

@@ -70,6 +70,22 @@ AC_DEFUN([OVS_CHECK_ESX],
       AC_DEFINE([ESX], [1], [Define to 1 if building on ESX.])
    fi])
 
+dnl Checks for MSVC x64 compiler.
+AC_DEFUN([OVS_CHECK_WIN64],
+  [AC_CACHE_CHECK(
+    [for MSVC x64 compiler],
+    [cl_cv_x64],
+    [dnl "cl" writes x64 output to stdin:
+     if (cl) 2>&1 | grep 'x64' >/dev/null 2>&1; then
+       cl_cv_x64=yes
+       MSVC64_LDFLAGS=" /MACHINE:X64 "
+     else
+       cl_cv_x64=no
+       MSVC64_LDFLAGS=""
+     fi])
+     AC_SUBST([MSVC64_LDFLAGS])
+])
+
 dnl Checks for WINDOWS.
 AC_DEFUN([OVS_CHECK_WIN32],
   [AC_CHECK_HEADER([windows.h],
@@ -86,11 +102,24 @@ AC_DEFUN([OVS_CHECK_WIN32],
             AC_MSG_ERROR([Invalid --with-pthread value])
               ;;
             *)
-            PTHREAD_WIN32_DIR=$withval/lib/x86
-            PTHREAD_WIN32_DIR_DLL=/${withval/:/}/dll/x86
+            if (cl) 2>&1 | grep 'x64' >/dev/null 2>&1; then
+              cl_cv_x64=yes
+            else
+              cl_cv_x64=no
+            fi
+            if test "$cl_cv_x64" = yes; then
+                PTHREAD_WIN32_DIR=$withval/lib/x64
+                PTHREAD_WIN32_DIR_DLL=/${withval/:/}/dll/x64
+                PTHREAD_WIN32_DIR_DLL_WIN_FORM=$withval/dll/x64
+            else
+                PTHREAD_WIN32_DIR=$withval/lib/x86
+                PTHREAD_WIN32_DIR_DLL=/${withval/:/}/dll/x86
+                PTHREAD_WIN32_DIR_DLL_WIN_FORM=$withval/dll/x86
+            fi
             PTHREAD_INCLUDES=-I$withval/include
             PTHREAD_LDFLAGS=-L$PTHREAD_WIN32_DIR
             PTHREAD_LIBS="-lpthreadVC2"
+            AC_SUBST([PTHREAD_WIN32_DIR_DLL_WIN_FORM])
             AC_SUBST([PTHREAD_WIN32_DIR_DLL])
             AC_SUBST([PTHREAD_INCLUDES])
             AC_SUBST([PTHREAD_LDFLAGS])

windows/automake.mk

@@ -26,7 +26,7 @@ windows_installer: all
 	cp -f $(top_srcdir)/ovsdb/ovsdb-client.pdb windows/ovs-windows-installer/Symbols/
 	cp -f $(top_srcdir)/ovsdb/ovsdb-tool.pdb windows/ovs-windows-installer/Symbols/
 #Third party files needed by the installer
-	cp -f $(PTHREAD_TEMP_DIR)/../../dll/x86/*.dll windows/ovs-windows-installer/Binaries/
+	cp -f $(PTHREAD_WIN32_DIR_DLL_WIN_FORM)/*.dll windows/ovs-windows-installer/Binaries/
 	cp -f "/c/Program Files (x86)/Common Files/Merge Modules/Microsoft_VC120_CRT_x86.msm" windows/ovs-windows-installer/Redist/Microsoft_VC120_CRT_x86.msm
 #Forwarding extension files needed for the installer
 	cp -f $(top_srcdir)/datapath-windows/x64/Win8$(VSTUDIO_CONFIG)/package/ovsext.cat windows/ovs-windows-installer/Driver/Win8/ovsext.cat