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# Define variables for alignment of int64, void*, and double
function(alignof VAR_ALIGNOF_INT64_T VAR_ALIGNOF_VOIDP VAR_ALIGNOF_DOUBLE)
if(NOT DEFINED ${VAR_ALIGNOF_DOUBLE})
# Compile alignment checker source
set(alignof_checker_target ${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CheckAlignOf.bin)
set(alignof_checker_source_dir ${CMAKE_CURRENT_LIST_DIR})
try_compile(alignof_checker_ok
${CMAKE_BINARY_DIR}
${alignof_checker_source_dir}/CheckAlignment.c
COPY_FILE ${alignof_checker_target})
if(alignof_checker_ok)
# Match 1,4, 8,16,32 or 64 alignments
set(alignof_pat_regex "(1|4|8|16|32|64)")
# Read patterns from compiled executable
FILE(STRINGS ${alignof_checker_target} alignof_int64_pat
REGEX "^INT64_ALIGNMENT=${alignof_pat_regex}" LIMIT_COUNT 1)
FILE(STRINGS ${alignof_checker_target} alignof_voidp_pat
REGEX "^VOIDP_ALIGNMENT=${alignof_pat_regex}" LIMIT_COUNT 1)
FILE(STRINGS ${alignof_checker_target} alignof_double_pat
REGEX "^DOUBLE_ALIGNMENT=${alignof_pat_regex}" LIMIT_COUNT 1)
# Extract alignments from patterns and assign them to the variables
string(REGEX MATCH "${alignof_pat_regex}$" int64_alignment "${alignof_int64_pat}")
string(REGEX MATCH "${alignof_pat_regex}$" double_alignment "${alignof_double_pat}")
string(REGEX MATCH "${alignof_pat_regex}$" voidp_alignment "${alignof_voidp_pat}")
# Cache the results
set(${VAR_ALIGNOF_INT64_T} ${int64_alignment} CACHE STRING "Alignment of int64_t")
set(${VAR_ALIGNOF_DOUBLE} ${double_alignment} CACHE STRING "Alignment of double")
set(${VAR_ALIGNOF_VOIDP} ${voidp_alignment} CACHE STRING "Alignment of void*")
# Report the results
foreach(alignof_type INT64_T DOUBLE VOIDP)
MESSAGE(STATUS "Check alignment of ${alignof_type}: ${${VAR_ALIGNOF_${alignof_type}}}")
endforeach(alignof_type)
else()
MESSAGE(FATAL_ERROR "Check alignment: unable to compile test program.")
endif(alignof_checker_ok)
if(NOT DEFINED ${VAR_ALIGNOF_INT64_T})
MESSAGE(FATAL_ERROR "Check alignment: unable to determine void*, double and int64_t alignment.")
endif()
endif(NOT DEFINED ${VAR_ALIGNOF_DOUBLE})
endfunction()
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