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19 lines
792 B
Plaintext
19 lines
792 B
Plaintext
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#
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# This function determines if the isnan function is available on this
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# platform.
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#
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AC_DEFUN([AC_FUNC_ISNAN],[
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AC_SINGLE_CXX_CHECK([HAVE_ISNAN_IN_MATH_H], [ac_cv_func_isnan_in_math_h],
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[isnan], [<math.h>],
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[#include <math.h>
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int foo(float f) {return isnan(f);}])
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AC_SINGLE_CXX_CHECK([HAVE_ISNAN_IN_CMATH], [ac_cv_func_isnan_in_cmath],
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[isnan], [<cmath>],
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[#include <cmath>
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int foo(float f) {return isnan(f);}])
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AC_SINGLE_CXX_CHECK([HAVE_STD_ISNAN_IN_CMATH], [ac_cv_func_std_isnan_in_cmath],
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[std::isnan], [<cmath>],
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[#include <cmath>
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using std::isnan; int foo(float f) {return isnan(f);}])
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])
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