cmake/CheckIfUnderscorePrefixedBesselFunctionsExist.cmake

# Ceres Solver - A fast non-linear least squares minimizer
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# Author: alexs.mac@gmail.com (Alex Stewart)

# Microsoft deprecated the POSIX Bessel functions: j[0,1,n]() in favour
# of _j[0,1,n](), it appears since at least MSVC 2005 [1].  This function
# checks if the underscore prefixed versions of the Bessel functions are
# defined, and sets ${HAVE_UNDERSCORE_PREFIXED_BESSEL_FUNCTIONS_VAR} to
# TRUE if they do.
#
# [1] https://msdn.microsoft.com/en-us/library/ms235384(v=vs.100).aspx
function(check_if_underscore_prefixed_bessel_functions_exist
    HAVE_UNDERSCORE_PREFIXED_BESSEL_FUNCTIONS_VAR)
  include(CheckCXXSourceCompiles)
  check_cxx_source_compiles(
    "#include <math.h>
     int main(int argc, char * argv[]) {
       double result;
       result = _j0(1.2345);
       result = _j1(1.2345);
       result = _jn(2, 1.2345);
       return 0;
     }"
     HAVE_UNDERSCORE_PREFIXED_BESSEL_FUNCTIONS)
   set(${HAVE_UNDERSCORE_PREFIXED_BESSEL_FUNCTIONS_VAR}
     ${HAVE_UNDERSCORE_PREFIXED_BESSEL_FUNCTIONS}
     PARENT_SCOPE)
endfunction()