BUG: When configuring compiler information files into the CMakeFiles directory in the project build tree, use IMMEDIATE option for CONFIGURE_FILE explicitly. It is needed in case the user sets CMAKE_BACKWARDS_COMPATIBILITY to 2.0 or lower.

Modules/CMakeDetermineCCompiler.cmake

@@ -132,7 +132,8 @@ INCLUDE(CMakeFindBinUtils)
 
 # configure variables set in this file for fast reload later on
 CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
-               "${CMAKE_PLATFORM_ROOT_BIN}/CMakeCCompiler.cmake"
-               @ONLY)
+  "${CMAKE_PLATFORM_ROOT_BIN}/CMakeCCompiler.cmake"
+  @ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
+  )
 
 SET(CMAKE_C_COMPILER_ENV_VAR "CC")

Modules/CMakeDetermineCXXCompiler.cmake

@@ -142,7 +142,8 @@ INCLUDE(CMakeFindBinUtils)
 
 # configure all variables set in this file
 CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
-               ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
-               @ONLY)
+  ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
+  @ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
+  )
 
 SET(CMAKE_CXX_COMPILER_ENV_VAR "CXX")

Modules/CMakeDetermineFortranCompiler.cmake

@@ -136,5 +136,6 @@ INCLUDE(CMakeFindBinUtils)
 # configure variables set in this file for fast reload later on
 CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeFortranCompiler.cmake.in
   ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeFortranCompiler.cmake
-  @ONLY)
+  @ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
+  )
 SET(CMAKE_Fortran_COMPILER_ENV_VAR "FC")

Modules/CMakeTestCCompiler.cmake

@@ -52,7 +52,7 @@ ELSE(NOT CMAKE_C_COMPILER_WORKS)
     CONFIGURE_FILE(
       ${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
       ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCCompiler.cmake
-      @ONLY
+      @ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
       )
   ENDIF(CMAKE_C_COMPILER_FORCED)
 ENDIF(NOT CMAKE_C_COMPILER_WORKS)

Modules/CMakeTestCXXCompiler.cmake

@@ -45,7 +45,7 @@ ELSE(NOT CMAKE_CXX_COMPILER_WORKS)
     CONFIGURE_FILE(
       ${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
       ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
-      @ONLY
+      @ONLY IMMEDIATE # IMMEDIATE must be here for compatibility mode <= 2.0
       )
   ENDIF(CMAKE_CXX_COMPILER_FORCED)
 ENDIF(NOT CMAKE_CXX_COMPILER_WORKS)