Factor generator expression docs out of add_test

This documentation may be reused wherever generator expressions are
supported.

Source/CMakeLists.txt

@@ -158,6 +158,7 @@ SET(SRCS
   cmDocumentationFormatterText.cxx
   cmDocumentationFormatterUsage.cxx
   cmDocumentationSection.cxx
+  cmDocumentGeneratorExpressions.h
   cmDocumentVariables.cxx
   cmDynamicLoader.cxx
   cmDynamicLoader.h

Source/cmAddTestCommand.h

@@ -13,6 +13,7 @@
 #define cmAddTestCommand_h
 
 #include "cmCommand.h"
+#include "cmDocumentGeneratorExpressions.h"
 
 /** \class cmAddTestCommand
  * \brief Add a test to the lists of tests to run.
@@ -77,19 +78,7 @@ public:
       "\n"
       "Arguments after COMMAND may use \"generator expressions\" with the "
       "syntax \"$<...>\".  "
-      "These expressions are evaluted during build system generation and "
-      "produce information specific to each generated build configuration.  "
-      "Valid expressions are:\n"
-      "  $<CONFIGURATION>          = configuration name\n"
-      "  $<TARGET_FILE:tgt>        = main file (.exe, .so.1.2, .a)\n"
-      "  $<TARGET_LINKER_FILE:tgt> = file used to link (.a, .lib, .so)\n"
-      "  $<TARGET_SONAME_FILE:tgt> = file with soname (.so.3)\n"
-      "where \"tgt\" is the name of a target.  "
-      "Target file expressions produce a full path, but _DIR and _NAME "
-      "versions can produce the directory and file name components:\n"
-      "  $<TARGET_FILE_DIR:tgt>/$<TARGET_FILE_NAME:tgt>\n"
-      "  $<TARGET_LINKER_FILE_DIR:tgt>/$<TARGET_LINKER_FILE_NAME:tgt>\n"
-      "  $<TARGET_SONAME_FILE_DIR:tgt>/$<TARGET_SONAME_FILE_NAME:tgt>\n"
+      CM_DOCUMENT_COMMAND_GENERATOR_EXPRESSIONS
       "Example usage:\n"
       "  add_test(NAME mytest\n"
       "           COMMAND testDriver --config $<CONFIGURATION>\n"

Source/cmDocumentGeneratorExpressions.h

@@ -0,0 +1,30 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2010 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmDocumentGeneratorExpressions_h
+#define cmDocumentGeneratorExpressions_h
+
+#define CM_DOCUMENT_COMMAND_GENERATOR_EXPRESSIONS                       \
+  "Generator expressions are evaluted during build system generation "  \
+  "to produce information specific to each build configuration.  "      \
+  "Valid expressions are:\n"                                            \
+  "  $<CONFIGURATION>          = configuration name\n"                  \
+  "  $<TARGET_FILE:tgt>        = main file (.exe, .so.1.2, .a)\n"       \
+  "  $<TARGET_LINKER_FILE:tgt> = file used to link (.a, .lib, .so)\n"   \
+  "  $<TARGET_SONAME_FILE:tgt> = file with soname (.so.3)\n"            \
+  "where \"tgt\" is the name of a target.  "                            \
+  "Target file expressions produce a full path, but _DIR and _NAME "    \
+  "versions can produce the directory and file name components:\n"      \
+  "  $<TARGET_FILE_DIR:tgt>/$<TARGET_FILE_NAME:tgt>\n"                  \
+  "  $<TARGET_LINKER_FILE_DIR:tgt>/$<TARGET_LINKER_FILE_NAME:tgt>\n"    \
+  "  $<TARGET_SONAME_FILE_DIR:tgt>/$<TARGET_SONAME_FILE_NAME:tgt>\n"
+
+#endif