BUG: When forcing the C and CXX compilers do not try to detect the ABI...

BUG: When forcing the C and CXX compilers do not try to detect the ABI information.  Cleanup configured language compiler info files by always using @ONLY.  This addresses bug#6297.

Modules/CMakeDetermineCCompiler.cmake

@@ -131,7 +131,8 @@ ENDIF(NOT CMAKE_C_COMPILER_ID_RUN)
 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" IMMEDIATE)
+CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
+               "${CMAKE_PLATFORM_ROOT_BIN}/CMakeCCompiler.cmake"
+               @ONLY)
 
 SET(CMAKE_C_COMPILER_ENV_VAR "CC")

Modules/CMakeDetermineCXXCompiler.cmake

@@ -141,7 +141,8 @@ ENDIF(NOT CMAKE_CXX_COMPILER_ID_RUN)
 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 IMMEDIATE)
+CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
+               ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
+               @ONLY)
 
 SET(CMAKE_CXX_COMPILER_ENV_VAR "CXX")

Modules/CMakeDetermineFortranCompiler.cmake

@@ -134,6 +134,7 @@ ENDIF(NOT CMAKE_Fortran_COMPILER_ID_RUN)
 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 IMMEDIATE)
+CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeFortranCompiler.cmake.in
+  ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeFortranCompiler.cmake
+  @ONLY)
 SET(CMAKE_Fortran_COMPILER_ENV_VAR "FC")

Modules/CMakeForceCompiler.cmake

@@ -38,14 +38,14 @@ MACRO(CMAKE_FORCE_C_COMPILER compiler id sizeof_void)
   SET(CMAKE_C_COMPILER_ID_RUN TRUE)
   SET(CMAKE_C_COMPILER_ID ${id})
   SET(CMAKE_C_COMPILER_WORKS TRUE)
+  SET(CMAKE_C_COMPILER_FORCED TRUE)
 
   # Set old compiler and platform id variables.
   IF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
     SET(CMAKE_COMPILER_IS_GNUCC 1)
   ENDIF("${CMAKE_C_COMPILER_ID}" MATCHES "GNU")
 
-  SET(CMAKE_SIZEOF_VOID_P ${sizeof_void} CACHE STRING "sizeof void")
-  SET(HAVE_CMAKE_SIZEOF_VOID_P TRUE CACHE INTERNAL "have sizeof void")
+  SET(CMAKE_C_SIZEOF_DATA_PTR ${sizeof_void})
 ENDMACRO(CMAKE_FORCE_C_COMPILER)
 
 MACRO(CMAKE_FORCE_CXX_COMPILER compiler id)
@@ -53,6 +53,7 @@ MACRO(CMAKE_FORCE_CXX_COMPILER compiler id)
   SET(CMAKE_CXX_COMPILER_ID_RUN TRUE)
   SET(CMAKE_CXX_COMPILER_ID ${id})
   SET(CMAKE_CXX_COMPILER_WORKS TRUE)
+  SET(CMAKE_CXX_COMPILER_FORCED TRUE)
 
   IF("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
     SET(CMAKE_COMPILER_IS_GNUCXX 1)

Modules/CMakeTestCCompiler.cmake

@@ -42,13 +42,18 @@ ELSE(NOT CMAKE_C_COMPILER_WORKS)
   ENDIF(C_TEST_WAS_RUN)
   SET(CMAKE_C_COMPILER_WORKS 1 CACHE INTERNAL "")
 
-  # Try to identify the ABI and configure it into CMakeCCompiler.cmake
-  INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
-  CMAKE_DETERMINE_COMPILER_ABI(C ${CMAKE_ROOT}/Modules/CMakeCCompilerABI.c)
-  CONFIGURE_FILE(
-    ${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
-    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCCompiler.cmake
-    @ONLY
-    )
+  IF(CMAKE_C_COMPILER_FORCED)
+    # The compiler was forced by the CMAKE_FORCE_C_COMPILER macro.
+    # Assume the user has configured all compiler information.
+  ELSE(CMAKE_C_COMPILER_FORCED)
+    # Try to identify the ABI and configure it into CMakeCCompiler.cmake
+    INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
+    CMAKE_DETERMINE_COMPILER_ABI(C ${CMAKE_ROOT}/Modules/CMakeCCompilerABI.c)
+    CONFIGURE_FILE(
+      ${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCCompiler.cmake
+      @ONLY
+      )
+  ENDIF(CMAKE_C_COMPILER_FORCED)
 ENDIF(NOT CMAKE_C_COMPILER_WORKS)
 

Modules/CMakeTestCXXCompiler.cmake

@@ -35,12 +35,17 @@ ELSE(NOT CMAKE_CXX_COMPILER_WORKS)
   ENDIF(CXX_TEST_WAS_RUN)
   SET(CMAKE_CXX_COMPILER_WORKS 1 CACHE INTERNAL "")
 
-  # Try to identify the ABI and configure it into CMakeCXXCompiler.cmake
-  INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
-  CMAKE_DETERMINE_COMPILER_ABI(CXX ${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp)
-  CONFIGURE_FILE(
-    ${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
-    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
-    @ONLY
-    )
+  IF(CMAKE_CXX_COMPILER_FORCED)
+    # The compiler was forced by the CMAKE_FORCE_CXX_COMPILER macro.
+    # Assume the user has configured all compiler information.
+  ELSE(CMAKE_CXX_COMPILER_FORCED)
+    # Try to identify the ABI and configure it into CMakeCXXCompiler.cmake
+    INCLUDE(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
+    CMAKE_DETERMINE_COMPILER_ABI(CXX ${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp)
+    CONFIGURE_FILE(
+      ${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXCompiler.cmake
+      @ONLY
+      )
+  ENDIF(CMAKE_CXX_COMPILER_FORCED)
 ENDIF(NOT CMAKE_CXX_COMPILER_WORKS)