Use cache for TQt executables paths.

This allows these values to be pre-defined
- for example, to optimize cross-build.

This resolves issue #28.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 74654feb3b)

modules/FindTQt.cmake

@@ -19,10 +19,18 @@ if( NOT TQT_FOUND )
   tde_message_fatal( "Unable to find tqt!\n Try adding the directory in which the tqt.pc file is located\nto the PKG_CONFIG_PATH variable." )
 endif( )
 
+mark_as_advanced(
+    TMOC_EXECUTABLE
+    MOC_EXECUTABLE
+    UIC_EXECUTABLE
+)
+
 # tmoc_executable
 tde_execute_process(
   COMMAND pkg-config tqt --variable=tmoc_executable
-  OUTPUT_VARIABLE TMOC_EXECUTABLE OUTPUT_STRIP_TRAILING_WHITESPACE )
+  OUTPUT_VARIABLE TMOC_EXECUTABLE
+  CACHE FILEPATH "TQt tmoc executable path"
+  OUTPUT_STRIP_TRAILING_WHITESPACE )
 
 if( NOT EXISTS ${TMOC_EXECUTABLE} )
   tde_message_fatal( "tmoc is not found!\n tqt is correctly installed?" )
@@ -34,7 +42,9 @@ tqt_message( "  tmoc path: ${TMOC_EXECUTABLE}" )
 # moc_executable
 tde_execute_process(
   COMMAND pkg-config tqt --variable=moc_executable
-  OUTPUT_VARIABLE MOC_EXECUTABLE OUTPUT_STRIP_TRAILING_WHITESPACE )
+  OUTPUT_VARIABLE MOC_EXECUTABLE
+  CACHE FILEPATH "TQt moc executable path"
+  OUTPUT_STRIP_TRAILING_WHITESPACE )
 
 if( NOT EXISTS ${MOC_EXECUTABLE} )
   tde_message_fatal( "Path to moc is not set.\n tqt is correctly installed?" )
@@ -46,7 +56,9 @@ tqt_message( "  moc path: ${MOC_EXECUTABLE}" )
 # uic_executable
 tde_execute_process(
   COMMAND pkg-config tqt --variable=uic_executable
-  OUTPUT_VARIABLE UIC_EXECUTABLE OUTPUT_STRIP_TRAILING_WHITESPACE )
+  OUTPUT_VARIABLE UIC_EXECUTABLE
+  CACHE FILEPATH "TQt uic executable path"
+  OUTPUT_STRIP_TRAILING_WHITESPACE )
 
 if( NOT EXISTS ${UIC_EXECUTABLE} )
   tde_message_fatal( "uic not found!\n tqt is correctly installed?" )