1 files changed, 35 insertions, 0 deletions
diff --git a/cmake/modules/CheckPrototypeExists.cmake b/cmake/modules/CheckPrototypeExists.cmake
new file mode 100644
index 00000000..da319f13
--- /dev/null
+++ b/cmake/modules/CheckPrototypeExists.cmake
@@ -0,0 +1,35 @@
+# - Check if the prototype for a function exists.
+# CHECK_PROTOTYPE_EXISTS (FUNCTION HEADER VARIABLE)
+#
+#  FUNCTION - the name of the function you are looking for
+#  HEADER - the header(s) where the prototype should be declared
+#  VARIABLE - variable to store the result
+#
+# 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
+
+INCLUDE(CheckCXXSourceCompiles)
+
+MACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT)
+   SET(_INCLUDE_FILES)
+   FOREACH (it ${_HEADER})
+      SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
+   ENDFOREACH (it)
+
+   SET(_CHECK_PROTO_EXISTS_SOURCE_CODE "
+${_INCLUDE_FILES}
+int main()
+{
+#ifndef ${_SYMBOL}
+   int i = sizeof(&${_SYMBOL});
+#endif
+  return 0;
+}
+")
+   CHECK_CXX_SOURCE_COMPILES("${_CHECK_PROTO_EXISTS_SOURCE_CODE}" ${_RESULT})
+ENDMACRO (CHECK_PROTOTYPE_EXISTS _SYMBOL _HEADER _RESULT)
+