Merge CMake changes from develop

Improved cross-compiling and toolchains

config/cmake_ext_mod/ConfigureChecks.cmake

@@ -273,7 +273,7 @@ if (NOT WINDOWS)
   set (HDF_EXTRA_C_FLAGS -D_GNU_SOURCE)
 
   option (HDF_ENABLE_LARGE_FILE "Enable support for large (64-bit) files on Linux." ON)
-  if (HDF_ENABLE_LARGE_FILE)
+  if (HDF_ENABLE_LARGE_FILE AND NOT DEFINED TEST_LFS_WORKS_RUN)
     set (msg "Performing TEST_LFS_WORKS")
     TRY_RUN (TEST_LFS_WORKS_RUN   TEST_LFS_WORKS_COMPILE
         ${CMAKE_BINARY_DIR}
@@ -563,7 +563,7 @@ endif ()
 if (WINDOWS)
   if (NOT HDF_NO_IOEO_TEST)
   message (STATUS "Checking for InitOnceExecuteOnce:")
-  if (NOT DEFINED ${${HDF_PREFIX}_HAVE_IOEO})
+  if (NOT DEFINED ${HDF_PREFIX}_HAVE_IOEO)
     if (LARGEFILE)
       set (CMAKE_REQUIRED_DEFINITIONS
           "${CURRENT_TEST_DEFINITIONS} -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE"