ENH: move the code which queries gcc for the system include dirs from

CMakeSystemSpecificInformation.cmake into a separate file,
CMakeEclipseCDT4.cmake
-if CMAKE_EXTRA_GENERATOR is set, i.e. either CodeBlocks or KDevelop3 or
EclipseCDT4, load a matching cmake script file, which can do things specific
for this generator
- added such files for Eclipse, KDevelop and CodeBlocks, one thing they all
do is they try to find the respective IDE and store it in the
CMAKE_(KDEVELOP3|CODEBLOCKS|ECLIPSE)_EXECUTABLE variable.
This could be used by cmake-gui to open the project it just generated with
the gui (not sure this is possible with eclipse).

Alex

Modules/CMakeCodeBlocks.cmake

@@ -0,0 +1,5 @@
+# This file is included in CMakeSystemSpecificInformation.cmake if
+# the CodeBlocks extra generator has been selected.
+
+FIND_PROGRAM(CMAKE_CODEBLOCKS_EXECUTABLE NAMES codeblocks DOC "The CodeBlocks executable")
+

Modules/CMakeEclipseCDT4.cmake

@@ -0,0 +1,39 @@
+# This file is included in CMakeSystemSpecificInformation.cmake if
+# the Eclipse CDT4 extra generator has been selected.
+
+FIND_PROGRAM(CMAKE_ECLIPSE_EXECUTABLE NAMES eclipse DOC "The Eclipse executable")
+
+
+# The Eclipse generator needs to know the standard include path
+# so that Eclipse ca find the headers at runtime and parsing etc. works better
+# This is done here by actually running gcc with the options so it prints its
+# system include directories, which are parsed then and stored in the cache.
+MACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang _result)
+  SET(${_result})
+  SET(_gccOutput)
+  FILE(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy" "\n" )
+  EXECUTE_PROCESS(COMMAND ${CMAKE_C_COMPILER} -v -E -x ${_lang} dummy
+                  WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/CMakeFiles
+                  ERROR_VARIABLE _gccOutput
+                  OUTPUT_QUIET )
+  FILE(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy")
+
+  IF( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list" )
+    SET(${_result} ${CMAKE_MATCH_1})
+    STRING(REPLACE "\n" " " ${_result} "${${_result}}")
+    SEPARATE_ARGUMENTS(${_result})
+  ENDIF( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list" )
+ENDMACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang)
+
+# Now check for C
+IF ("${CMAKE_C_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS)
+  _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c _dirs)
+  SET(CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "C compiler system include directories")
+ENDIF ("${CMAKE_C_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS)
+
+# And now the same for C++
+IF ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS)
+  _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c++ _dirs)
+  SET(CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "CXX compiler system include directories")
+ENDIF ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS)
+

Modules/CMakeKDevelop3.cmake

@@ -0,0 +1,5 @@
+# This file is included in CMakeSystemSpecificInformation.cmake if
+# the KDevelop3 extra generator has been selected.
+
+FIND_PROGRAM(CMAKE_KDEVELOP3_EXECUTABLE NAMES kdevelop DOC "The KDevelop3 executable")
+

Modules/CMakeSystemSpecificInformation.cmake

@@ -35,42 +35,12 @@ IF(NOT _INCLUDED_SYSTEM_INFO_FILE)
 ENDIF(NOT _INCLUDED_SYSTEM_INFO_FILE)
 
 
-# The Eclipse generator needs to know the standard include path
-# so that Eclipse ca find the headers at runtime and parsing etc. works better
-# This is done here by actually running gcc with the options so it prints its
-# system include directories, which are parsed then and stored in the cache.
-IF("${CMAKE_EXTRA_GENERATOR}" MATCHES "Eclipse")
-
-  MACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang _result)
-    SET(${_result})
-    SET(_gccOutput)
-    FILE(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy" "\n" )
-    EXECUTE_PROCESS(COMMAND ${CMAKE_C_COMPILER} -v -E -x ${_lang} dummy
-                   WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/CMakeFiles
-                   ERROR_VARIABLE _gccOutput
-                   OUTPUT_QUIET )
-    FILE(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy")
-
-    IF( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list" )
-      SET(${_result} ${CMAKE_MATCH_1})
-      STRING(REPLACE "\n" " " ${_result} "${${_result}}")
-      SEPARATE_ARGUMENTS(${_result})
-    ENDIF( "${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list" )
-  ENDMACRO(_DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang)
-
-  # Now check for C
-  IF ("${CMAKE_C_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS)
-    _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c _dirs)
-    SET(CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "C compiler system include directories")
-  ENDIF ("${CMAKE_C_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_C_SYSTEM_INCLUDE_DIRS)
-
-  # And now the same for C++
-  IF ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS)
-    _DETERMINE_GCC_SYSTEM_INCLUDE_DIRS(c++ _dirs)
-    SET(CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS "${_dirs}" CACHE INTERNAL "CXX compiler system include directories")
-  ENDIF ("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU  AND NOT  CMAKE_ECLIPSE_CXX_SYSTEM_INCLUDE_DIRS)
-
-ENDIF("${CMAKE_EXTRA_GENERATOR}" MATCHES "Eclipse")
+# optionally include a file which can do extra-generator specific things, e.g.
+# CMakeEclipseCDT4.cmake asks gcc for the system include dirs for the Eclipse CDT4 generator
+IF(CMAKE_EXTRA_GENERATOR)
+  STRING(REPLACE " " "" _CMAKE_EXTRA_GENERATOR_NO_SPACES ${CMAKE_EXTRA_GENERATOR} )
+  INCLUDE("CMake${_CMAKE_EXTRA_GENERATOR_NO_SPACES}" OPTIONAL)
+ENDIF(CMAKE_EXTRA_GENERATOR)
 
 
 # for most systems a module is the same as a shared library