ENH: Made Check* modules more consistent and well documented. Added CMAKE_REQUIRED_DEFINITIONS option.

Modules/CheckCSourceCompiles.cmake

@@ -3,10 +3,14 @@
 # - macro which checks if the source code compiles
 #  SOURCE   - source code to try to compile
 #  VAR - variable to store size if the type exists.
-# Checks the following optional VARIABLES (not arguments)
-#  CMAKE_REQUIRED_LIBRARIES - Link to extra libraries
-#  CMAKE_REQUIRED_FLAGS - Extra flags to C compiler
 #
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
 
 MACRO(CHECK_C_SOURCE_COMPILES SOURCE VAR)
   IF("${VAR}" MATCHES "^${VAR}$")
@@ -31,6 +35,7 @@ MACRO(CHECK_C_SOURCE_COMPILES SOURCE VAR)
     TRY_COMPILE(${VAR}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/src.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       "${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}"
       "${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"

Modules/CheckCXXSourceCompiles.cmake

@@ -3,10 +3,14 @@
 # - macro which checks if the source code compiles\
 #  SOURCE - source code to try to compile
 #  VAR    - variable to store size if the type exists.
-# Checks the following optional VARIABLES (not arguments)
-#  CMAKE_REQUIRED_LIBRARIES - Link to extra libraries
-#  CMAKE_REQUIRED_FLAGS     - Extra flags to C compiler
 #
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
 
 MACRO(CHECK_CXX_SOURCE_COMPILES SOURCE VAR)
   IF("${VAR}" MATCHES "^${VAR}$")
@@ -31,6 +35,7 @@ MACRO(CHECK_CXX_SOURCE_COMPILES SOURCE VAR)
     TRY_COMPILE(${VAR}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/src.cxx
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       "${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES}"
       "${CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES}"

Modules/CheckFunctionExists.cmake

@@ -3,10 +3,14 @@
 # - macro which checks if the function exists
 #  FUNCTION - the name of the function
 #  VARIABLE - variable to store the result
-# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
-# compile of the program likewise if CMAKE_REQUIRED_LIBRARIES is set then
-# those libraries will be linked against the test program
 #
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
 
 MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
@@ -14,14 +18,24 @@ MACRO(CHECK_FUNCTION_EXISTS FUNCTION VARIABLE)
       "-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
     MESSAGE(STATUS "Looking for ${FUNCTION}")
     IF(CMAKE_REQUIRED_LIBRARIES)
-      SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES 
+      SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+    ELSE(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
     ENDIF(CMAKE_REQUIRED_LIBRARIES)
+    IF(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    ELSE(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_FUNCTION_EXISTS_ADD_INCLUDES)
+    ENDIF(CMAKE_REQUIRED_INCLUDES)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_ROOT}/Modules/CheckFunctionExists.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
       "${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}"
+      "${CHECK_FUNCTION_EXISTS_ADD_INCLUDES}"
       OUTPUT_VARIABLE OUTPUT)
     IF(${VARIABLE})
       SET(${VARIABLE} 1 CACHE INTERNAL "Have function ${FUNCTION}")

Modules/CheckIncludeFile.cmake

@@ -7,8 +7,20 @@
 # an optional third argument is the CFlags to add to the compile line 
 # or you can use CMAKE_REQUIRED_FLAGS
 #
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+#
 MACRO(CHECK_INCLUDE_FILE INCLUDE VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    IF(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_INCLUDE_FILE_C_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
+    ELSE(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_INCLUDE_FILE_C_INCLUDE_DIRS)
+    ENDIF(CMAKE_REQUIRED_INCLUDES)
     SET(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
     SET(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
     CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CheckIncludeFile.c.in
@@ -22,8 +34,10 @@ MACRO(CHECK_INCLUDE_FILE INCLUDE VARIABLE)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckIncludeFile.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
+      "${CHECK_INCLUDE_FILE_C_INCLUDE_DIRS}"
       OUTPUT_VARIABLE OUTPUT) 
 
     IF(${ARGC} EQUAL 3)

Modules/CheckIncludeFileCXX.cmake

@@ -7,8 +7,20 @@
 # An optional third argument is the CFlags to add to the compile line 
 # or you can use CMAKE_REQUIRED_FLAGS.
 #
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+#
 MACRO(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    IF(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
+    ELSE(CMAKE_REQUIRED_INCLUDES)
+      SET(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS)
+    ENDIF(CMAKE_REQUIRED_INCLUDES)
     SET(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
     SET(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
     CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CheckIncludeFile.cxx.in
@@ -22,8 +34,10 @@ MACRO(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckIncludeFile.cxx
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
+      "${CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS}"
       OUTPUT_VARIABLE OUTPUT) 
 
     IF(${ARGC} EQUAL 3)

Modules/CheckIncludeFiles.cmake

@@ -4,11 +4,13 @@
 #
 #  INCLUDE  - list of files to include
 #  VARIABLE - variable to return result
-#   
-# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
-# compile of the program
-# If CMAKE_REQUIRED_INCLUDES is set then those directories will be passed
-# as include paths to the compiler
+#
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
 
 MACRO(CHECK_INCLUDE_FILES INCLUDE VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
@@ -32,6 +34,7 @@ MACRO(CHECK_INCLUDE_FILES INCLUDE VARIABLE)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckIncludeFiles.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILES_FLAGS}
       "${CHECK_INCLUDE_FILES_INCLUDE_DIRS}"

Modules/CheckLibraryExists.cmake

@@ -5,11 +5,13 @@
 #  FUNCTION - the name of the function
 #  LOCATION - location where the library should be found
 #  VARIABLE - variable to store the result
-#  
-# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
-# compile of the program likewise if CMAKE_REQUIRED_LIBRARIES is set then
-# those libraries will be linked against the test program
-
+#
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
 
 MACRO(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
@@ -20,10 +22,13 @@ MACRO(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
     IF(CMAKE_REQUIRED_LIBRARIES)
       SET(CHECK_LIBRARY_EXISTS_LIBRARIES 
         ${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
+    ELSE(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_LIBRARY_EXISTS_LIBRARIES)
     ENDIF(CMAKE_REQUIRED_LIBRARIES)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_ROOT}/Modules/CheckFunctionExists.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
       -DLINK_DIRECTORIES:STRING=${LOCATION}

Modules/CheckSymbolExists.cmake

@@ -4,11 +4,14 @@
 #  SYMBOL   - symbol
 #  FILES    - include files to check
 #  VARIABLE - variable to return result
-#  
-# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
-# compile of the program likewise if CMAKE_REQUIRED_LIBRARIES is set then
-# those libraries will be linked against the test program
-
+#
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_INCLUDES = list of include directories
+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
 
 MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
@@ -40,6 +43,7 @@ MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckSymbolExists.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS 
       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
       "${CHECK_SYMBOL_EXISTS_LIBS}"

Modules/CheckVariableExists.cmake

@@ -3,23 +3,31 @@
 #  
 #  VAR      - the name of the variable
 #  VARIABLE - variable to store the result
-# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
-# compile of the program likewise if CMAKE_REQUIRED_LIBRARIES is set then
-# those libraries will be linked against the test program.
+#
 # This macro is only for C variables.
 #
+# The following variables may be set before calling this macro to
+# modify the way the check is run:
+#
+#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
+#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
+#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
+
 MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE)
   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
     SET(MACRO_CHECK_VARIABLE_DEFINITIONS 
       "-DCHECK_VARIABLE_EXISTS=${VAR} ${CMAKE_REQUIRED_FLAGS}")
     MESSAGE(STATUS "Looking for ${VAR}")
     IF(CMAKE_REQUIRED_LIBRARIES)
-      SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES 
+      SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+    ELSE(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES)
     ENDIF(CMAKE_REQUIRED_LIBRARIES)
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_ROOT}/Modules/CheckVariableExists.c
+      COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
       "${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}"
       OUTPUT_VARIABLE OUTPUT)