#
 # Check for struct packing features
 # This feature reworked from m4/reorganization/code_checks/compiler_attribs.m4
 #
 
 GET_FILENAME_COMPONENT(_selfdir_CheckStructPacking
     "${CMAKE_CURRENT_LIST_FILE}" PATH)
 
 # Check if __attribute__((packed)) is available
 check_c_source_compiles(
     "
     #ifdef __GNUC__
     struct { int i __attribute__((packed)); } s;
     #else
     #error Only checking for packed attribute on gcc-like compilers
     #endif
     "
     HAVE_ATTRIB_PACKED )
 if(NOT HAVE_ATTRIB_PACKED)
     # Check for packing via pragma (HAVE_PRAGMA_PACK)
     try_run(
         # Name of variable to store the run result (process exit status; number) in:
         test_run_result
         # Name of variable to store the compile result (TRUE or FALSE) in:
         test_compile_result
         # Binary directory:
         ${CMAKE_CURRENT_BINARY_DIR}
         # Source file to be compiled:
         ${_selfdir_CheckStructPacking}/CheckStructPacking_PRAGMA_PACK.c
         # Where to store the output produced during compilation:
         COMPILE_OUTPUT_VARIABLE test_compile_output
         # Where to store the output produced by running the compiled executable:
         RUN_OUTPUT_VARIABLE test_run_output )
 
     # Did compilation succeed and process return 0 (success)?
     if("${test_compile_result}" AND ("${test_run_result}" EQUAL 0))
         set(HAVE_PRAGMA_PACK 1)
     endif()
 
     if(NOT HAVE_PRAGMA_PACK)
         # Check for packing via hppa/hp-uux pragma (HAVE_PRAGMA_PACK_HPPA)
         try_run(
             # Name of variable to store the run result (process exit status; number) in:
             test_run_result
             # Name of variable to store the compile result (TRUE or FALSE) in:
             test_compile_result
             # Binary directory:
             ${CMAKE_CURRENT_BINARY_DIR}
             # Source file to be compiled:
             ${_selfdir_CheckStructPacking}/CheckStructPacking_PRAGMA_PACK_HPPA.c
             # Where to store the output produced during compilation:
             COMPILE_OUTPUT_VARIABLE test_compile_output
             # Where to store the output produced by running the compiled executable:
             RUN_OUTPUT_VARIABLE test_run_output )
 
         # Did compilation succeed and process return 0 (success)?
         if("${test_compile_result}" AND ("${test_run_result}" EQUAL 0))
             set(HAVE_PRAGMA_PACK_HPPA 1)
         endif()
     endif()
 endif()
 
 # Check if struct __attribute__((aligned)) is available
 check_c_source_compiles(
     "
     typedef int cl_aligned_int __attribute__((aligned));
     "
     HAVE_ATTRIB_ALIGNED )
 
 if (NOT (HAVE_ATTRIB_PACKED OR HAVE_PRAGMA_PACK OR HAVE_PRAGMA_PACK_HPPA))
     message(FATAL_ERROR "Failed to determine how to pack structs with this compiler!")
 endif()