# Ceres Solver - A fast non-linear least squares minimizer

# Copyright 2017 Google Inc. All rights reserved.

# http://ceres-solver.org/

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# * Redistributions of source code must retain the above copyright notice,

#   this list of conditions and the following disclaimer.

# * Redistributions in binary form must reproduce the above copyright notice,

#   this list of conditions and the following disclaimer in the documentation

#   and/or other materials provided with the distribution.

# * Neither the name of Google Inc. nor the names of its contributors may be

#   used to endorse or promote products derived from this software without

#   specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# 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()