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function(cgal_parse_version_h version_h_file name)
file(READ "${version_h_file}" version_file_content)
string(REGEX MATCH "define CGAL_VERSION (.*)\n#define *CGAL_VERSION_NR 1(0([0-9])|([1-9][0-9]))([0-9][0-9])([0-9])([0-9][0-9][0-9])" CGAL_VERSION_FOUND "${version_file_content}")
if (NOT CGAL_VERSION_FOUND)
message(FATAL_ERROR "Cannot extract CGAL version number.")
endif()
set(${name} "${CMAKE_MATCH_1}" PARENT_SCOPE)
# Now handle the optional arguments, to fill the version numbers
# CMAKE_MATCH_2 corresponds to the alternative ([0-9])|([1-9][0-9])).
# CMAKE_MATCH_3 and CMAKE_MATCH_4 corresponds to the two sub-expressions
# of the alternative, and cannot be non-empty at the same time.
set(${ARGV2} "${CMAKE_MATCH_3}${CMAKE_MATCH_4}" PARENT_SCOPE) # major version
MATH(EXPR ${ARGV3} "${CMAKE_MATCH_5}") # minor version without leading 0
set(${ARGV3} "${${ARGV3}}" PARENT_SCOPE)
set(${ARGV4} "${CMAKE_MATCH_6}" PARENT_SCOPE) # patch number
MATH(EXPR ${ARGV5} "${CMAKE_MATCH_7}") # build number version without leading 0
set(${ARGV5} "${${ARGV5}}" PARENT_SCOPE) # build number
endfunction()
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