git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7360 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 54 insertions, 0 deletions

diff --git a/branch-3.0/CMake/CheckFunctionWithHeaderExists.cmake b/branch-3.0/CMake/CheckFunctionWithHeaderExists.cmake
new file mode 100644
index 000000000..46694e82a
--- /dev/null
+++ b/branch-3.0/CMake/CheckFunctionWithHeaderExists.cmake
@@ -0,0 +1,54 @@
+#
+# Check if the symbol exists in include files
+#
+# CHECK_FUNCTIONWITHHEADER_EXISTS - macro which checks the symbol exists in include files.
+# SYMBOL - symbol
+# FILES  - include files to check
+# VARIABLE - variable to return result
+#
+
+MACRO(CHECK_FUNCTIONWITHHEADER_EXISTS SYMBOL FILES VARIABLE)
+  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    SET(CHECK_SYMBOL_EXISTS_CONTENT "/* */\n")
+    SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
+    IF(CMAKE_REQUIRED_LIBRARIES)
+      SET(CHECK_SYMBOL_EXISTS_LIBS 
+        "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+    ENDIF(CMAKE_REQUIRED_LIBRARIES)
+    FOREACH(FILE ${FILES})
+      SET(CHECK_SYMBOL_EXISTS_CONTENT
+        "${CHECK_SYMBOL_EXISTS_CONTENT}#include <${FILE}>\n")
+    ENDFOREACH(FILE)
+    SET(CHECK_SYMBOL_EXISTS_CONTENT
+      "${CHECK_SYMBOL_EXISTS_CONTENT}\nint main()\n{\n${SYMBOL};return 0;\n}\n")
+
+    FILE(WRITE ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c 
+      "${CHECK_SYMBOL_EXISTS_CONTENT}")
+
+    MESSAGE(STATUS "Looking for ${SYMBOL}")
+    TRY_COMPILE(${VARIABLE}
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
+      CMAKE_FLAGS 
+      -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
+      "${CHECK_SYMBOL_EXISTS_LIBS}"
+      OUTPUT_VARIABLE OUTPUT)
+    IF(${VARIABLE})
+      MESSAGE(STATUS "Looking for ${SYMBOL} - found")
+      SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")
+      FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log 
+        "Determining if the ${SYMBOL} "
+        "exist passed with the following output:\n"
+        "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c:\n"
+        "${CHECK_SYMBOL_EXISTS_CONTENT}\n")
+    ELSE(${VARIABLE})
+      MESSAGE(STATUS "Looking for ${SYMBOL} - not found.")
+      SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}")
+      FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeError.log 
+        "Determining if the ${SYMBOL} "
+        "exist failed with the following output:\n"
+        "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c:\n"
+        "${CHECK_SYMBOL_EXISTS_CONTENT}\n")
+    ENDIF(${VARIABLE})
+  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ENDMACRO(CHECK_FUNCTIONWITHHEADER_EXISTS)