Use work-around from bug 4772 for C++ and Fortran

The commit "fix for bug 4772" added a work-around to CMakeCInformation
for platform config files that put compiler information in the system
file (like SunOS flags for GCC).  This commit adds the same work-around
for CXX and Fortran.  It is necessary to support enabling these
languages separately from C in other subdirectories.

The commit "Avoid (Unix|Windows)Paths.cmake multiple include" added
include blockers that prevent the files from multiple inclusion, so it
is safe to include the system information files from every language.

See issue #4772 and issue #9656.

3 files changed, 27 insertions, 13 deletions

diff --git a/Modules/CMakeCInformation.cmake b/Modules/CMakeCInformation.cmake
index aa8fdc7..fb4f0e8 100644
--- a/Modules/CMakeCInformation.cmake
+++ b/Modules/CMakeCInformation.cmake
@@ -58,13 +58,12 @@ IF (NOT _INCLUDED_FILE)
   INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} 
     OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
 ENDIF (NOT _INCLUDED_FILE)
-# some systems include the compiler information in the system file
-# and if this is the enable_language command then it may not have been
-# included at this point, or needs to be included again so that the
-# language_INIT variables are set correctly
+# We specify the compiler information in the system file for some
+# platforms, but this language may not have been enabled when the file
+# was first included.  Include it again to get the language info.
+# Remove this when all compiler info is removed from system files.
 IF (NOT _INCLUDED_FILE)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME} 
-    OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME} OPTIONAL)
 ENDIF (NOT _INCLUDED_FILE)
 
 
diff --git a/Modules/CMakeCXXInformation.cmake b/Modules/CMakeCXXInformation.cmake
index 681e495..9929dfa 100644
--- a/Modules/CMakeCXXInformation.cmake
+++ b/Modules/CMakeCXXInformation.cmake
@@ -54,7 +54,15 @@ IF(CMAKE_CXX_COMPILER_ID)
   INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
 ENDIF(CMAKE_CXX_COMPILER_ID)
 IF (NOT _INCLUDED_FILE)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL
+          RESULT_VARIABLE _INCLUDED_FILE)
+ENDIF (NOT _INCLUDED_FILE)
+# We specify the compiler information in the system file for some
+# platforms, but this language may not have been enabled when the file
+# was first included.  Include it again to get the language info.
+# Remove this when all compiler info is removed from system files.
+IF (NOT _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME} OPTIONAL)
 ENDIF (NOT _INCLUDED_FILE)
 
 
diff --git a/Modules/CMakeFortranInformation.cmake b/Modules/CMakeFortranInformation.cmake
index 8d61cfb..ea4feb0 100644
--- a/Modules/CMakeFortranInformation.cmake
+++ b/Modules/CMakeFortranInformation.cmake
@@ -28,13 +28,20 @@ IF(CMAKE_COMPILER_IS_GNUG77)
   SET(CMAKE_BASE_NAME g77)
 ENDIF(CMAKE_COMPILER_IS_GNUG77)
 IF(CMAKE_Fortran_COMPILER_ID)
-  IF(EXISTS ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_Fortran_COMPILER_ID}-Fortran.cmake)
-    SET(CMAKE_BASE_NAME ${CMAKE_Fortran_COMPILER_ID}-Fortran)
-  ENDIF(EXISTS ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_Fortran_COMPILER_ID}-Fortran.cmake)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_Fortran_COMPILER_ID}-Fortran OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
 ENDIF(CMAKE_Fortran_COMPILER_ID)
-SET(CMAKE_SYSTEM_AND_Fortran_COMPILER_INFO_FILE
-  ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}.cmake)
-INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL)
+IF (NOT _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL
+          RESULT_VARIABLE _INCLUDED_FILE)
+ENDIF (NOT _INCLUDED_FILE)
+# We specify the compiler information in the system file for some
+# platforms, but this language may not have been enabled when the file
+# was first included.  Include it again to get the language info.
+# Remove this when all compiler info is removed from system files.
+IF (NOT _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME} OPTIONAL)
+ENDIF (NOT _INCLUDED_FILE)
+
 
 # This should be included before the _INIT variables are
 # used to initialize the cache.  Since the rule variables