COMP: add wmake rules for mingw (#1238)

etc/config.csh/settings

@@ -227,6 +227,13 @@ setenv FOAM_RUN "$WM_PROJECT_USER_DIR/run"
 # Default to system compiler
 if (! $?WM_COMPILER_TYPE ) setenv WM_COMPILER_TYPE system
 
+# Cross-compiling
+switch ("$WM_COMPILER")
+case Mingw*:
+    setenv WM_OSTYPE MSwindows
+    breaksw
+endsw
+
 # Adjustments for non-gcc compilers
 switch ("$WM_COMPILER")
 case Clang*:  # Clang compiler suite

etc/config.sh/mpi

@@ -321,6 +321,20 @@ INTELMPI*)
     _foamAddPath    "$MPI_ARCH_PATH/intel64/bin"
     _foamAddLib     "$MPI_ARCH_PATH/intel64/lib"
     ;;
+
+MSMPI)
+    export FOAM_MPI=msmpi
+    _foamEtc -config  mpi-msmpi                 # <- Adjustments (optional)
+
+    # Respect MPI_ARCH_PATH if set to a valid directory (eg, user adjustments)
+    if [ ! -d "$MPI_ARCH_PATH" ]
+    then
+        export MPI_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$FOAM_MPI
+    fi
+
+    # _foamAddPath    "$MPI_ARCH_PATH/bin"
+    _foamAddLib     "$MPI_ARCH_PATH/lib/x64"
+    ;;
 esac
 
 

etc/config.sh/settings

@@ -227,6 +227,17 @@ export FOAM_RUN="$WM_PROJECT_USER_DIR/run"
 # Default to system compiler
 : ${WM_COMPILER_TYPE:=system}; export WM_COMPILER_TYPE
 
+# Cross-compiling
+case "$WM_COMPILER" in
+(Mingw*)
+    export WM_OSTYPE=MSwindows
+    export WM_CC="$(wmake -show-c)"
+    export WM_CXX="$(wmake -show-cxx)"
+    export WM_CFLAGS="$(wmake -show-cflags)"
+    export WM_CXXFLAGS="$(wmake -show-cxxflags)"
+    ;;
+esac
+
 # Adjust for non-gcc compilers
 case "$WM_COMPILER" in
 Clang*)    # Clang compiler suite