ENH: add macro to test if a member has specified struct, e.g.

check_struct_has_member("struct stat" st_rdev    "${CFG_HEADERS}" HAVE_STRUCT_STAT_ST_RDEV)

Alex

Modules/CMakeLists.txt

@@ -1,5 +1,5 @@
 # just install the modules
-# new file added, force rerunning cmake
+# new file added, force rerunning cmake #
 
 SUBDIRS(Platform)
 INSTALL_FILES(${CMAKE_DATA_DIR}/Modules .*\\.cmake$)

Modules/CheckStructHasMember.cmake

@@ -0,0 +1,39 @@
+# - Check if the given struct or class has the specified member variable
+# CHECK_STRUCT_HAS_MEMBER (STRUCT MEMBER HEADER VARIABLE)
+#
+#  STRUCT - the name of the struct or class you are interested in
+#  MEMBER - the member which existence you want to check
+#  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
+#
+# Example: CHECK_STRUCT_HAS_MEMBER("struct timeval" tv_sec sys/select.h HAVE_TIMEVAL_TV_SEC)
+
+
+INCLUDE(CheckCSourceCompiles)
+
+MACRO (CHECK_STRUCT_HAS_MEMBER _STRUCT _MEMBER _HEADER _RESULT)
+   SET(_INCLUDE_FILES)
+   FOREACH (it ${_HEADER})
+      SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
+   ENDFOREACH (it)
+
+   SET(_CHECK_STRUCT_MEMBER_SOURCE_CODE "
+${_INCLUDE_FILES}
+int main()
+{
+   ${_STRUCT}* tmp;
+   tmp->${_MEMBER};
+  return 0;
+}
+")
+   CHECK_C_SOURCE_COMPILES("${_CHECK_STRUCT_MEMBER_SOURCE_CODE}" ${_RESULT})
+
+ENDMACRO (CHECK_STRUCT_HAS_MEMBER)
+