cmake/FindCXX11MathFunctions.cmake

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

# FindCXX11MathFunctions.cmake - Find C++11 math functions.
#
# This module defines the following variables:
#
# CXX11_MATH_FUNCTIONS_FOUND: TRUE if C++11 math functions are found.

macro(find_cxx11_math_functions)
  # To support CXX11 option, clear the results of all check_xxx() functions
  # s/t we always perform the checks each time, otherwise CMake fails to
  # detect that the tests should be performed again after CXX11 is toggled.
  unset(CXX11_MATH_FUNCTIONS_FOUND CACHE)

  # Verify that all C++11-specific math functions used by jet.h exist.
  check_cxx_source_compiles("#include <cmath>
                             #include <cstddef>
                             static constexpr size_t kMaxAlignBytes = alignof(std::max_align_t);
                             int main() {
                                std::cbrt(1.0);
                                std::exp2(1.0);
                                std::log2(1.0);
                                std::hypot(1.0, 1.0);
                                std::fmax(1.0, 1.0);
                                std::fmin(1.0, 1.0);
                                return 0;
                             }"
                             CXX11_MATH_FUNCTIONS_FOUND)
endmacro()