Expose devenv make file variable

Change-Id: I502ce280276b6430053f0fbcf9cc3248b6c9b11b
Reviewed-on: https://gerrit.libreoffice.org/16801Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

config_host.mk.in

@@ -613,6 +613,7 @@ export UUIDGEN=@UUIDGEN@
 export VALGRIND_CFLAGS=$(gb_SPACE)@VALGRIND_CFLAGS@
 export VALIDATOR_EXTENSION_PACK=@VALIDATOR_EXTENSION_PACK@
 export VCVER=@VCVER@
+export DEVENV=@DEVENV@
 export VERBOSE=@VERBOSE@
 export VISIO_CFLAGS=$(gb_SPACE)@VISIO_CFLAGS@
 export VISIO_LIBS=$(gb_SPACE)@VISIO_LIBS@

configure.ac

@@ -3517,6 +3517,7 @@ find_msvc()
 
 SHOWINCLUDES_PREFIX=
 MSBUILD_PATH=
+DEVENV=
 if test "$_os" = "WINNT"; then
     if test "$WITH_MINGW" != "yes"; then
         AC_MSG_CHECKING([Visual C++])
@@ -3565,6 +3566,12 @@ if test "$_os" = "WINNT"; then
             MSBUILD_PATH=`win_short_path_for_make "$regvalue"`
         fi
 
+        # Find the version of devenv.exe
+        DEVENV="$VC_PRODUCT_DIR/../Common7/IDE/devenv.exe"
+        if test ! -e "$DEVENV"; then
+            AC_MSG_ERROR([No devenv.exe found, Visual Studio installation broken?])
+        fi
+
         dnl ===========================================================
         dnl  Check for the corresponding mspdb*.dll
         dnl ===========================================================
@@ -3746,6 +3753,7 @@ if test "$_os" = "WINNT"; then
     fi
 fi
 AC_SUBST(VCVER)
+AC_SUBST(DEVENV)
 PathFormat "$MSPDB_PATH"
 MSPDB_PATH="$formatted_path"
 AC_SUBST(SHOWINCLUDES_PREFIX)