COMP: handle forced use of gcc/g++ for wmake components

- does not change WM_OPTIONS or output directories, so that the target
  directories are correct.

etc/tools/ThirdPartyFunctions

@@ -211,6 +211,16 @@ useGcc()
     export CXX=g++
 }
 
+
+# Force use of system gcc/g++ (wmake compilation) without changing the
+# WM_OPTIONS or output directories
+useGccWmake()
+{
+    export WM_COMPILER=Gcc
+    export WM_COMPILER_TYPE=system
+}
+
+
 # Scan arguments for a '-gcc' option, forcing gcc/g++ when found
 useGccFlag()
 {

makeCCMIO

@@ -73,7 +73,7 @@ do
     case "$1" in
     '') ;;      # Ignore empty
     -h | -help) usage   ;;
-    -gcc)       useGcc  ;;
+    -gcc)       useGccWmake ;;
 
     lib|libso)
         targetType="$1"

makeKAHIP

@@ -96,7 +96,7 @@ do
     case "$1" in
     '') ;;      # Ignore empty
     -h | -help) usage   ;;
-    -gcc)       useGcc  ;;
+    -gcc)       useGccWmake ;;
     -force)     optForce=true ;;
 
     -cmake)